Sound producing device, headrest system, seat, and transportation vehicle

Abstract

The present application provides a sound producing device, a headrest system, a seat, and a transportation vehicle, applied to the technical field of electronics. The sound producing device comprises: a processing circuit, a first loudspeaker and a second loudspeaker; the processing circuit comprises a first sub-circuit and a second sub-circuit; the first sub-circuit is configured to receive an input signal and output a first signal to the first loudspeaker; the second sub-circuit is configured to receive the input signal and output a second signal to the second loudspeaker; and the phase of the first signal is different from that of the second signal. In the present application, signals provided to the first loudspeaker and the second loudspeaker in the sound producing device are adjusted by means of the processing circuit, so as to change radiated sound fields of the first loudspeaker and the second loudspeaker, thereby accurately controlling sound. Additionally, the structure is simple, the cost is low, and the impact on other areas can be reduced when the sound effect experience of a target area is changed.

Description

Sound generating device, headrest system, seat and vehicle

[0001] The present application claims priority to the Chinese patent application No. 202410865719.5, filed on June 28, 2024, and entitled "Sound generating device, headrest system, seat and vehicle", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] Embodiments of the present application relate to the field of electronic technology, in particular to a sound generating device, a headrest system, a seat and a vehicle. BACKGROUND

[0003] With the rapid development and application of intelligent cockpit, the intelligent cockpit can provide customers with a more high-quality user experience. In order to improve the sound experience of users in different areas (such as the main driver area or the co-driver area or the rear area), the noise in different areas is cancelled by local active noise reduction. Or, different sound field effects are generated in different areas by partitioned sound field reconstruction, so that passengers in different areas can achieve personalized sound experience. However, when local active noise reduction and partitioned sound field reconstruction change the noise or sound field in a certain area, they will also affect other areas. For example, the reverse sound waves generated by local active noise reduction in the main driver area will propagate to the rear area, affecting the noise reduction effect of the rear area.

[0004] Therefore, how to reduce the impact on other areas when changing the sound experience of the target area has become a technical problem to be solved. SUMMARY

[0005] The present application provides a sound generating device, a headrest system, a seat and a vehicle, which can reduce the impact on other areas when changing the sound experience of the target area.

[0006] In order to achieve the above-mentioned purpose, the present application provides the following technical solutions:

[0007] In a first aspect, the present application provides a sound generating device, comprising: a processing circuit, a first loudspeaker and a second loudspeaker; the processing circuit comprises a first sub-circuit and a second sub-circuit; the first sub-circuit is configured to receive an input signal and output a first signal to the first loudspeaker; the second sub-circuit is configured to receive the input signal and output a second signal to the second loudspeaker; wherein the phases of the first signal and the second signal are different.

[0008] In the present application, the processing circuit in the sound generating device adjusts the signals provided to the first loudspeaker and the second loudspeaker to change the radiated sound field of the first loudspeaker and the second loudspeaker, thereby achieving precise control of sound. Moreover, the structure is simple, the cost is low, and the impact on other areas can be reduced when changing the sound experience of the target area.

[0009] According to the first aspect, the first signal and the second signal have different amplitudes.

[0010] The first sub-circuit and the second sub-circuit are analog circuits preset in the sound generating device and used for processing the sound signal.

[0011] The input signal is a signal received by the sound generating device and used for controlling the sound generating device to generate sound. The input signal can be a digital signal or an analog signal and is used for instructing the sound generating device to generate sound.

[0012] The first speaker and the second speaker can be closed speakers. The speaker units used by the first speaker and the second speaker can be moving coil speakers.

[0013] In the present application, the input signal is received by the first sub-circuit and the second sub-circuit in the processing circuit and signals with different amplitudes and phases are output, so that the first speaker and the second speaker generate different sound fields. When the sound fields of the first speaker and the second speaker are superimposed together, the desired sound field effect can be formed in the area where the sound generating device is located, and in other areas, the intensity of the sound can be reduced or eliminated due to the interference and superposition effect of the sound waves, thereby reducing the influence of the sound generating device on other areas when generating sound.

[0014] According to the first aspect, or any one of the implementations of the first aspect, the first sub-circuit is configured to output the input signal as the first signal to the first speaker; the second sub-circuit includes an amplification circuit and a phase adjustment circuit, the phase adjustment circuit being connected between the amplification circuit and the second speaker; the amplification circuit is configured to amplify the amplitude of the input signal, and output the amplified signal as a first amplified signal to the phase adjustment circuit; the phase adjustment circuit is configured to adjust the phase of the first amplified signal, and output the adjusted signal as the second signal to the second speaker.

[0015] In some examples, the amplification circuit is a reverse amplification circuit, the amplification circuit is implemented by an inverting amplifier, and the phase adjustment circuit is implemented by an all-pass phase shifter.

[0016] According to a first aspect, or any possible implementation mode of the first aspect, the amplification circuit comprises a first resistor, a second resistor and a first amplifier; a first end of the first resistor is configured to receive the input signal, a second end of the first resistor is connected to an inverting input terminal of the first amplifier; a first end of the second resistor is connected to an output terminal of the first amplifier, a second end of the second resistor is connected to the inverting input terminal of the first amplifier; a non-inverting input terminal of the first amplifier is grounded; the phase adjustment circuit comprises a third resistor, a fourth resistor, a fifth resistor, a capacitor and a second amplifier; a first end of the third resistor is connected to the output terminal of the first amplifier, a second end of the third resistor is connected to an inverting input terminal of the second amplifier; a first end of the fourth resistor is connected to the output terminal of the first amplifier, a second end of the fourth resistor is connected to a non-inverting input terminal of the second amplifier; a first end of the fifth resistor is connected to an output terminal of the second amplifier, a second end of the fifth resistor is connected to the inverting input terminal of the second amplifier; a first end of the capacitor is connected to the second end of the fourth resistor, a second end of the capacitor is grounded.

[0017] In the present application, the first sub-circuit in the processing circuit does not process the input signal, and the second sub-circuit performs amplitude amplification processing and phase processing on the input signal. In this way, the amplitudes and phases of the signals received by the first speaker and the second speaker are different, and the first speaker and the second speaker accurately control the sound field according to the received signals, thereby reducing the influence on other areas when changing the sound effect experience of the target area.

[0018] According to a first aspect, or any possible implementation mode of the first aspect, the first sub-circuit comprises an amplification circuit configured to perform amplitude amplification processing on the input signal and output the amplified signal as the first information to the first speaker; and the second sub-circuit comprises a phase adjustment circuit configured to perform phase adjustment on the input signal and output the adjusted signal as the second signal to the second speaker.

[0019] In some examples, the amplification circuit comprises a reverse amplification circuit and an in-phase amplification circuit.

[0020] According to a first aspect, or any possible implementation mode of the first aspect, the amplification circuit comprises a first resistor, a second resistor and a first amplifier; a first end of the second resistor is configured to receive the input signal, and a second end of the second resistor is connected to an inverting input terminal of the first amplifier; a first end of the first resistor is connected to an output terminal of the first amplifier, and a second end of the first resistor is connected to the inverting input terminal of the first amplifier; a non-inverting input terminal of the first amplifier is grounded; the phase adjustment circuit comprises a third resistor, a fourth resistor, a fifth resistor, a capacitor and a second amplifier; a first end of the third resistor is configured to receive the input signal, and a second end of the third resistor is connected to an inverting input terminal of the second amplifier; a first end of the fourth resistor is configured to receive the input signal, and a second end of the fourth resistor is connected to a non-inverting input terminal of the second amplifier; a first end of the fifth resistor is connected to an output terminal of the second amplifier, and a second end of the fifth resistor is connected to the inverting input terminal of the second amplifier; a first end of the capacitor is connected to the second end of the fourth resistor, and a second end of the capacitor is grounded.

[0021] In some examples, the amplification circuit is implemented by an inverting amplifier, and the phase adjustment circuit is implemented by an all-pass phase shifter.

[0022] According to a first aspect, or any possible implementation mode of the first aspect, the amplification circuit comprises a first resistor, a second resistor and a first amplifier; a non-inverting input terminal of the first amplifier is configured to receive the input signal, and an output terminal of the first amplifier is connected to a first end of the first resistor; a second end of the first resistor is connected to a first end of the second resistor, and the second end of the first resistor is also connected to an inverting input terminal of the first amplifier; a second end of the second resistor is grounded; the phase adjustment circuit comprises a third resistor, a fourth resistor, a fifth resistor, a capacitor and a second amplifier; a first end of the third resistor is configured to receive the input signal, and a second end of the third resistor is connected to an inverting input terminal of the second amplifier; a first end of the capacitor is configured to receive the input signal, and a second end of the capacitor is connected to a non-inverting input terminal of the second amplifier; a first end of the fourth resistor is connected to the second end of the capacitor, and a second end of the fourth resistor is grounded; a first end of the fifth resistor is connected to an output terminal of the second amplifier, and a second end of the fifth resistor is connected to the inverting input terminal of the second amplifier.

[0023] In some examples, the amplification circuit is implemented by a non-inverting amplifier, and the phase adjustment circuit is implemented by an all-pass phase shifter.

[0024] In the present application, the first sub-circuit in the processing circuit amplifies the amplitude of the input signal, and the second sub-circuit amplifies the amplitude and adjusts the phase of the input signal. In this way, the amplitudes and phases of the signals received by the first speaker and the second speaker are different, and the first speaker and the second speaker can accurately control the sound field according to the received signals, thereby reducing the influence on other areas when changing the sound effect experience of the target area.

[0025] In some examples, the ratio of the first resistance and the second resistance ranges from 1 to 10.

[0026] In some examples, the third resistance, the fourth resistance and the fifth resistance have the same resistance value, and the product of the resistance value of the third resistance and the capacitance value of the capacitor ranges from 1 x 10 –5 second-1 x 10 –3 second.

[0027] In some examples, the sound generating device can further include a first power amplifier and a second power amplifier. One end of the first power amplifier is connected to the first sub-circuit, and the other end of the first power amplifier is connected to the first speaker. One end of the second power amplifier is connected to the second sub-circuit, and the other end of the second power amplifier is connected to the second speaker.

[0028] According to the first aspect, or any one of the implementations of the first aspect, the sound outlet direction of the first speaker is different from the sound outlet direction of the second speaker.

[0029] In some examples, the first speaker and the second speaker are arranged back to back, the sound outlet direction of the first speaker is towards the front of the vehicle, and the sound outlet direction of the second speaker is towards the rear of the vehicle.

[0030] According to the first aspect, or any one of the implementations of the first aspect, the sound outlet direction of the first speaker is the same as the sound outlet direction of the second speaker, and the sound outlet of the first speaker and the sound outlet of the second speaker are not located in the same plane.

[0031] In some examples, the sound outlet of the first speaker and the sound outlet of the second speaker are both towards the front of the vehicle, but the sound outlet of the first speaker and the sound outlet of the second speaker are not located in the same plane in the vertical direction, and the first speaker and the second speaker are staggered.

[0032] According to the first aspect, or any one of the implementations of the first aspect, the sound generating device further includes a first cabinet and a second cabinet, the first speaker is arranged in the first cabinet, and the second speaker is arranged in the second cabinet.

[0033] In some examples, each speaker in the sound generating device is independently installed, and one cabinet is arranged to correspond to one speaker.

[0034] In this application, each speaker is independently arranged in a cabinet, which can better control the sound field and the directivity of the sound. Independent installation of each speaker can also reduce sound interference between different speakers, and the structure is simple, which is conducive to subsequent maintenance.

[0035] According to the first aspect, or any one of the implementations of the first aspect, the sound generating device further comprises a third cabinet, the third cabinet comprising a partition; the first speaker and the second speaker are arranged in the third cabinet, and the first speaker and the second speaker are located on two sides of the partition.

[0036] In some examples, the plurality of speakers in the sound generating device are integrated in the same cabinet, and each speaker is separated by a partition in the cabinet.

[0037] In the present application, the plurality of speakers are integrated in the same cabinet and separated by a partition, which can reduce the number of cabinets, save space and materials, and optimize space utilization and material costs. The partition can effectively isolate the sound generated by different speakers and prevent mutual interference of sound generated by different speakers.

[0038] According to the first aspect, or any one of the implementations of the first aspect, the sound generating device further comprises a third speaker; the processing circuit further comprises a third sub-circuit, the third sub-circuit being configured to receive an input signal and output a third signal to the third speaker; wherein the phases of the first signal, the second signal and the third signal are different.

[0039] In the second aspect, the present application provides a headrest system, comprising a headrest and the sound generating device according to the first aspect, the sound generating device being arranged close to the headrest.

[0040] In some examples, the headrest comprises a cushion, and the cushion has one or more mounting holes for mounting the sound generating device.

[0041] In the third aspect, the present application provides a seat, comprising the sound generating device according to the first aspect.

[0042] In the fourth aspect, the present application provides a vehicle, comprising the sound generating device according to the first aspect, or the headrest system according to the second aspect, or the seat according to the third aspect.

[0043] In the fifth aspect, the present application provides a sound generating device design method, which is used to design the sound generating device according to the first aspect. The sound generating device design method comprises: obtaining vehicle data, determining the cabinet size of each speaker in the sound generating device according to the vehicle data; determining a target area, a non-target area, a target demand and an input signal; determining the electro-acoustic transfer function of each speaker to each measurement point in the target area and the electro-acoustic transfer function of each speaker to each measurement point in the non-target area; determining the circuit parameters in the preset circuit according to the electro-acoustic transfer function of each speaker to each measurement point in the target area and the electro-acoustic transfer function of each speaker to each measurement point in the non-target area; and constructing the sound generating device according to the circuit parameters.

[0044] In a sixth aspect, the present application provides a chip system, comprising at least one processor and at least one interface circuit, the at least one interface circuit being configured to perform a transceiving function, and the at least one processor being configured to perform the method according to the fifth aspect.

[0045] In a seventh aspect, the present application provides a computer-readable storage medium storing one or more computer programs, the one or more computer programs comprising instructions which, when executed on a computer, cause the computer to perform the method according to the fifth aspect.

[0046] In an eighth aspect, the present application provides a computer program product, comprising: a computer program or instructions, which, when running on a computer, cause the computer to perform the method according to the fifth aspect.

[0047] The technical effects of the second aspect to the eighth aspect and any implementation manner of the aspects can refer to the technical effects of the first aspect and any implementation manner of the first aspect, which will not be described herein. BRIEF DESCRIPTION OF DRAWINGS

[0048] FIG. 1 is a structural schematic diagram of a vehicle according to an embodiment of the present application;

[0049] FIG. 2 is a structural schematic diagram of a seat according to an embodiment of the present application;

[0050] FIG. 3 is a structural schematic diagram of a headrest system according to an embodiment of the present application;

[0051] FIG. 4 is a structural schematic diagram of a sound generating device according to an embodiment of the present application;

[0052] FIG. 5A is a schematic diagram of a loudspeaker in a sound generating device according to an embodiment of the present application;

[0053] FIG. 5B is a schematic diagram of a loudspeaker in a sound generating device according to an embodiment of the present application;

[0054] FIG. 6 is a structural schematic diagram of a sound generating device according to an embodiment of the present application;

[0055] FIG. 7 is a structural schematic diagram of a sound generating device according to an embodiment of the present application;

[0056] FIG. 8 is a structural schematic diagram of a sound generating device according to an embodiment of the present application;

[0057] FIG. 9 is a structural schematic diagram of a sound generating device according to an embodiment of the present application;

[0058] FIG. 10 is a structural schematic diagram of a sound generating device according to an embodiment of the present application;

[0059] Fig. 11 is a flow diagram of a method for designing a sound generating device according to an embodiment of the present application;

[0060] Fig. 12 is a schematic diagram of a box structure of a sound generating device according to an embodiment of the present application;

[0061] Fig. 13 is a top view of a vehicle according to an embodiment of the present application;

[0062] Fig. 14 is a schematic diagram of a relationship between a circuit parameter and a difference between an average sound pressure of a target area and an average sound pressure of a non-target area according to an embodiment of the present application;

[0063] Fig. 15 is a schematic diagram of a value of a circuit parameter according to an embodiment of the present application;

[0064] Fig. 16 is a sound pressure level distribution diagram according to an embodiment of the present application;

[0065] Fig. 17 is a schematic diagram of a structure of a device for designing a sound generating device according to an embodiment of the present application;

[0066] Fig. 18 is a schematic diagram of a structure of a chip system according to an embodiment of the present application. DETAILED DESCRIPTION

[0067] In the description of the present application, unless otherwise stated, " / " means or, for example, A / B can mean A or B; "and / or" herein merely describes an association relationship of associated objects, which means that there can be three relationships, for example, A and / or B, which means that there are three cases of A alone, A and B together, and B alone.

[0068] Hereinafter, the terms "first" and "second" are used only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first" and "second" can explicitly or implicitly include one or more of the features.

[0069] In the description of the present application, unless otherwise stated, "multiple" means two or more. In the present application, the words "exemplary" or "for example" are used to mean serving as an example, instance, or illustration. Any embodiment or design scheme described as "exemplary" or "for example" in the present application should not be interpreted as more preferred or more advantageous than other embodiments or design schemes. Rather, the use of "exemplary" or "for example" is intended to present the relevant concept in a specific manner.

[0070] Referring to Fig. 1, a schematic diagram of a structure of a vehicle 100, the vehicle 100 can include various subsystems, such as wheels 110, a power system, a computer system, and a vehicle body 120.

[0071] It is to be understood that the vehicle 100 can include more or fewer subsystems, and each subsystem can include multiple elements. Additionally, each subsystem and element of the vehicle 100 can be interconnected by wires or wirelessly.

[0072] The power system and the wheels 110 are disposed on the vehicle body 120, and the power system is in driving connection with the wheels 110 to drive the wheels 110 to rotate, thereby providing power for the vehicle 100 to travel. The number of the wheels 110 can include 4, 6, 8, etc., and the embodiment of the present application will be introduced by taking the number of the wheels 110 as 4. However, it is to be understood that the embodiment of the present application does not limit the number of the wheels 110. Correspondingly, two of the four wheels 110 (two front wheels) are disposed on the front side of the vehicle body 120 along the longitudinal direction (the traveling direction of the vehicle 100), and the other two wheels 110 (two rear wheels 110) are disposed on the rear side of the vehicle body 120 along the longitudinal direction.

[0073] The power system can be in driving connection with the two front wheels 110 (front drive), or in driving connection with the two rear wheels 110 (rear drive), or in driving connection with the four wheels 110 (four-wheel drive), and the embodiment of the present application does not limit this. In the embodiment of the present application, the vehicle 100 can be a fuel vehicle, and correspondingly, the power system includes an internal combustion engine and a gearbox in driving connection with the internal combustion engine, the gearbox is in driving connection with the wheels 110, and the internal combustion engine drives the wheels 110 to rotate through the gearbox, thereby driving the vehicle 100 to travel. Of course, the vehicle 100 in the embodiment of the present application can also be an electric vehicle, and correspondingly, the power system includes an electric motor and a power battery in electrical connection with the electric motor, the electric motor is in driving connection with the wheels 110, and in the process of traveling, the power battery drives the electric motor to work, thereby driving the wheels 110 to rotate to provide driving force.

[0074] Some or all functions of the vehicle 100 are controlled by a computer system. The computer system can include at least one processor and a memory, and the processor executes instructions stored in a non-transitory computer-readable medium such as the memory. The computer system can also be a plurality of computing devices that control individual components or subsystems of the vehicle 100 using a distributed manner.

[0075] The processor can be any conventional processor, such as a commercially available central processing unit (CPU). Alternatively, the processor can be a special purpose device such as an application-specific integrated circuit (ASIC) or other hardware-based processor.

[0076] The computer system can control functions of the vehicle 100 based on inputs received from various vehicle subsystems (e.g., powertrain system, etc.).

[0077] In some embodiments, the vehicle 100 can further include a vehicle controller (not shown in FIG. 1), which can also be described as a powertrain controller or an intelligent driving computing platform, and is a core control component of the entire vehicle. It collects input information of various systems and components, and controls the actions of various components in the vehicle 100 to drive the vehicle 100 to travel according to the corresponding judgments based on the above input information.

[0078] The vehicle body 120 surrounds a vehicle cabin, which is divided into a driver's cabin 121 and a passenger cabin 122 according to positions. When riding, the user is located in the driver's cabin 121 or the passenger cabin 122. It can be understood that the passenger cabin 122 can also be divided into a co-driver area and a rear area, which is not shown in FIG. 1.

[0079] It can be understood that the above components can be communicatively coupled together in a wired and / or wireless manner. The above components are only an example, and in actual applications, components in each module can be added or deleted according to actual needs, and FIG. 1 should not be understood as a limitation on the vehicle in the embodiments of the present application.

[0080] The vehicle 100 described above can be a new energy vehicle, an electric vehicle, a car, a truck, a motorcycle, a bus, an entertainment vehicle, an amusement park vehicle, a golf cart, etc. The power of the vehicle 100 described above can be provided by gasoline, diesel, electricity, solar energy, hydrogen energy, etc. The vehicle 100 can also be a movable vehicle such as a ship, an airplane, a helicopter, a lawn mower, construction equipment, a trolley, and a train, etc., which is not particularly limited in the embodiments of the present application.

[0081] In order to facilitate the user to ride, the vehicle 100 further includes a seat 130 as shown in FIG. 2, which is arranged in the driver's cabin 121 and the passenger cabin 122. The seat 130 includes a seat cushion 131 and a backrest 132, the seat cushion 131 is connected with the vehicle body 120, and the backrest 132 is arranged at one end (rear end) of the seat cushion 131. The user can ride on the seat cushion 131 and lean the torso on the backrest 132. The vehicle 100 further includes a headrest system 140 arranged on the backrest 132. In the process of the user riding, the headrest system 140 can support and protect the user's head to improve the comfort of riding.

[0082] In some implementations, the headrest system 140 can be detachably connected with the top end of the backrest 132. In other implementations, the headrest system 140 can also be an integral structure with the backrest 132, which is not limited in the embodiments of the present application.

[0083] To provide a better sound experience for the user, the headrest system 140 includes a headrest and a sound device, and the sound device is arranged close to the headrest. The number of sound devices can be one or more. The sound device can be arranged in the headrest, or the sound device can be arranged near the headrest. The embodiments of the present application do not limit this. For example, the sound device can be arranged on both sides of the headrest.

[0084] Taking the example that the sound device is arranged on both sides of the headrest, referring to FIG. 3, a structural schematic diagram of the headrest system 140 is shown. FIG. 3(a) is a structural schematic diagram of the headrest system 140, and the headrest system 140 includes an outer cover 141, a headrest 142, and a sound device 143. The outer cover 141 wraps the headrest 142 and contacts the user's head. The material of the outer cover 141 can be leather, cloth, etc. The headrest 142 includes a cushioning body for providing support force for the user's head. The material of the cushioning body can be sponge, rubber, etc. with certain elasticity. The sound device 143 can be arranged in the cushioning body of the headrest 142. For example, a mounting hole is arranged on the cushioning body, and the sound device 143 is arranged in the mounting hole.

[0085] FIG. 3(b) is a front view of the headrest system 140, and the outer cover 141 can further include a plurality of through holes 144. The through holes 144 can be arranged on the outer cover 141 corresponding to the area of the sound device 143. When the sound device 143 sounds, the sound can be transmitted to the user through the through holes 144. The number and shape of the through holes 144 are not limited in the embodiments of the present application.

[0086] It can be understood that the sound device 143 can create a sound field around the headrest system 140 to play audio to the user. For example, the sound device 143 can play music, play an external warning sound (such as the sound of a horn of another vehicle), actively reduce noise (play noise reduction sound), provide privacy sound (such as conversation sound, etc.), and the like to improve the user experience.

[0087] Of course, in some implementations, other sound devices can also be included in the vehicle 100. For example, a sound device is arranged on the inner side of the door, and the sound device is used to play audio to the driver's cabin 121 and / or the passenger cabin 122. Alternatively, a sound device is arranged on the central control platform of the vehicle 100.

[0088] It can be understood that the sound device 143 in the headrest system 140 is closer to the user's ear than other sound devices in the vehicle 100, has a greater impact on the user's hearing, and affects the user's sound experience.

[0089] In actual use, when the headrest system 140 makes a sound, the sound field of the area where the headrest system 140 is located will change, and the sound field of other areas will also be affected. For example, the driver in the front driver area plays music through the headrest system on the front driver seat, while the user in the rear area is sleeping. When the headrest system in the front driver area plays music, the driver can hear the music. However, due to the propagation of sound, the sound in the front driver area will propagate to the rear area, and the sound intensity will gradually decrease with the increase of distance. The user in the rear area will also hear some sound, affecting the user's rest.

[0090] It can be understood that the above examples are explained by taking different areas of a vehicle as an example. In actual application, this problem also exists in life and work scenes. For example, in a family, when one person listens to music or watches TV through a home theater, the sound will propagate to other rooms, affecting the work or rest of other family members.

[0091] Therefore, how to reduce the impact on other areas when changing the sound effect experience of the target area and accurately control the sound has become a technical problem to be solved.

[0092] In some examples, in a free space, a near-field loudspeaker is designed by a sound radiation mode method and a spectrum decomposition method, so that the sound pressure of the near-field loudspeaker is large in the near field when the near-field loudspeaker makes a sound, but the sound pressure rapidly attenuates in the far field. However, the near-field loudspeaker designed by the above method needs a large number of loudspeaker units, and the cost is high; and the above near-field loudspeaker is designed based on the characteristics of the free space sound field, and is not suitable for a vehicle cabin with an irregular shape.

[0093] In other examples, in a free space, precise control of the sound field is achieved by combining sources, but a large number of loudspeaker units are also needed in the combination source, and the cost is relatively high; and the combination source is mainly applied to free or semi-free space, and is not applied to a vehicle cabin.

[0094] It can be understood that the sound control method applied in the free space in the above examples can accurately control the sound, but a large number of loudspeakers are needed, and the cost is high.

[0095] In some examples, in a vehicle cabin, the projection and control of directional sound are achieved by using end-fire directional arrays. Specifically, a sound emitting device is arranged on each side of the headrest, and the sound emitting device uses an end-fire directional array. Since the end-fire directional array has a directional distribution in the direction perpendicular to the loudspeaker array, when designing the end-fire directional array on the seat, the end-fire directional arrays on both sides of the headrest need to be arranged vertically to the headrest. The end-fire directional arrays on both sides of the headrest form a semi-enclosed structure with the headrest, which wraps around the back and sides of the user's head. However, the headrest with the semi-enclosed structure is not conducive to driving, limits the movement of the user's head; also blocks the user's view, increases the blind area, and is not conducive to the user's observation of traffic conditions; increases the risk of driving and safety hazards, and affects the comfort and safety of driving.

[0096] In some examples, in a vehicle cabin, the projection and control of directional sound are achieved by using phase shift sources. Specifically, a sound emitting device is arranged on the headrest of each seat in the vehicle cabin, and the sound emitting device uses a hypercardioid phase shift source. The hypercardioid phase shift source can change the phase of the sound wave, concentrate sound energy in a specific area, and weaken sound in other directions. However, the phase shift source needs to be arranged on each seat, which is complex in structure and high in cost.

[0097] To solve the above technical problems, the embodiment of the present application provides a sound emitting device, which comprises a processing circuit, a first loudspeaker and a second loudspeaker. The processing circuit adjusts the signals provided to the first loudspeaker and the second loudspeaker to change the radiation sound field of the first loudspeaker and the second loudspeaker, and accurately controls the sound. Moreover, the structure is simple, the cost is low, and the influence on other areas can be reduced when changing the sound effect experience of the target area.

[0098] The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all embodiments.

[0099] The sound emitting device provided by the embodiment of the present application will be introduced below with the vehicle as the application scenario. It can be understood that the sound emitting device in the embodiment of the present application can also be applied to other scenarios (such as home, work, entertainment, etc.).

[0100] Referring to FIG. 4, it is a structural schematic diagram of a sound emitting device 400 provided by the embodiment of the present application. The sound emitting device 400 comprises a processing circuit, a first loudspeaker and a second loudspeaker.

[0101] In the embodiment of the present application, the processing circuit comprises a first sub-circuit and a second sub-circuit. The first sub-circuit is configured to receive an input signal and output a first signal to the first loudspeaker; the second sub-circuit is configured to receive the input signal and output a second signal to the second loudspeaker. Wherein, the phase of the first signal and the second signal is different.

[0102] Optionally, the first signal and the second signal have the same or different amplitudes. In actual applications, the amplitudes of the first signal and the second signal are mostly different.

[0103] Optionally, the first sub-circuit and the second sub-circuit are analog circuits preset in the sound generating device and used for processing sound signals.

[0104] It can be understood that the modules in the sound generating device can be combined and installed (for example, integrated in the same device) or independently installed. Taking the case that the sound generating device is installed in a vehicle as an example, the processing circuit, the first loudspeaker, and the second loudspeaker in the sound generating device are integrated in a headrest. Alternatively, the processing circuit in the sound generating device is installed in a seat backrest, and the first loudspeaker and the second loudspeaker are installed in the headrest. The embodiments of the present application do not limit the installation mode of the sound generating device.

[0105] Optionally, the sound generating device 400 can include more or fewer components, and each component can include multiple elements. The components and elements in the sound generating device 400 are communicatively connected.

[0106] The input signal is a signal received by the sound generating device and used for controlling the sound generating device to generate sound. The input signal can be a digital signal or an analog signal and is used for instructing the sound generating device to generate sound.

[0107] Optionally, the input signal includes frequency information, amplitude information, time domain information, spectrum information, phase information, and the like.

[0108] Taking a vehicle as an application scenario, in some examples, a vehicle controller generates an input signal in response to a user operation and transmits the input signal to the sound generating device. For example, a driver triggers the vehicle to play music, the vehicle controller generates an audio signal in response to the user operation and transmits the audio signal to the sound generating device, and the sound generating device plays music according to the audio signal.

[0109] In other examples, the vehicle controller generates an input signal in response to a signal detected by a sensor and transmits the input signal to the sound generating device. For example, a microphone sensor in a vehicle cabin detects noise in the vehicle cabin and sends detection data to the vehicle controller. The vehicle controller generates an input signal according to the detection data and transmits the input signal to the sound generating device. The sound generating device emits an anti-phase sound wave according to the input signal to offset the noise in the vehicle cabin.

[0110] The first signal is a signal output by the first sub-circuit after the input signal is transmitted through the first sub-circuit.

[0111] The second signal is a signal output by the second sub-circuit after the input signal is transmitted through the second sub-circuit.

[0112] In the embodiments of the present application, the first loudspeaker and the second loudspeaker can be closed loudspeakers, and the sizes of the closed boxes used by the first loudspeaker and the second loudspeaker are consistent.

[0113] It can be understood that, since the inside of the box is closed, the loudspeaker unit is constrained when vibrating in the box, and audio distortion and the like are reduced; the closed loudspeaker can well control the vibration of the loudspeaker unit, reduce the influence of resonance or reflection, and is conducive to maintaining the phase characteristics of sound waves and improving the clarity of sound. The closed loudspeaker has a compact structure and can be flexibly installed or placed, and is suitable for being placed in a small space. When the closed loudspeaker sounds, it can reproduce the signal received by the closed loudspeaker and provide a more natural and balanced tone.

[0114] In some embodiments of the present application, the sound generating device further comprises a first box and a second box, the first loudspeaker is arranged in the first box, and the second loudspeaker is arranged in the second box.

[0115] It can be understood that, in the above embodiments, each loudspeaker is independently installed, and one loudspeaker is arranged in one box. Each loudspeaker is independently arranged in the box, which can better control the sound field and the directivity of sound. Independent installation of each loudspeaker can also reduce sound interference between different loudspeakers, and the structure is simple, which is conducive to subsequent maintenance.

[0116] In some embodiments of the present application, the sound generating device further comprises a third box, the third box comprises a partition plate; the first loudspeaker and the second loudspeaker are arranged in the third box, and the first loudspeaker and the second loudspeaker are located on two sides of the partition plate.

[0117] It can be understood that, in the above embodiments, a plurality of loudspeakers are integrated in the same box, and each loudspeaker is separated by a partition plate in the box. Integrating a plurality of loudspeakers in the same box and separating them by a partition plate can reduce the number of boxes, save space and materials, and optimize space utilization and material cost. The partition plate can effectively isolate the sound generated by different loudspeakers and prevent mutual interference of the sound generated by different loudspeakers.

[0118] In the embodiments of the present application, the loudspeaker units used by the first loudspeaker and the second loudspeaker can be moving coil loudspeakers. The models of the moving coil loudspeakers of the first loudspeaker and the second loudspeaker are consistent.

[0119] In some embodiments of the present application, the sound generating device further comprises a third box, the third box comprises a partition plate; the first loudspeaker and the second loudspeaker are arranged in the third box, and the first loudspeaker and the second loudspeaker are located on two sides of the partition plate.

[0120] As shown in FIG. 5A, a structure diagram of the first loudspeaker and the second loudspeaker in the sound production device is shown, and the analog circuit is not shown. The arrow indicates the direction of the sound outlet. In the case of the sound production device being applied to a vehicle, the first loudspeaker and the second loudspeaker are closed box loudspeakers, and the sizes of the closed boxes of the first loudspeaker and the second loudspeaker are the same.

[0121] As shown in (a) of FIG. 5A, a top view of the first loudspeaker and the second loudspeaker in the sound production device is shown. For example, the sound production device includes a first loudspeaker 501 and a second loudspeaker 502. The first loudspeaker 501 and the second loudspeaker 502 are arranged back to back, and the directions of the sound outlets of the first loudspeaker 501 and the second loudspeaker 502 are opposite directions. For example, the sound outlet of the first loudspeaker 501 is directed to the front of the vehicle (the front of the vehicle), and the sound outlet of the second loudspeaker 502 is directed to the rear of the vehicle (the rear of the vehicle). The plane on which the sound outlet of the first loudspeaker 501 is located and the plane on which the sound outlet of the second loudspeaker 502 is located are parallel.

[0122] For another example, the sound production device includes a first loudspeaker 503 and a second loudspeaker 504, and the directions of the sound outlets of the first loudspeaker 503 and the second loudspeaker 504 are different. For example, the sound outlet of the first loudspeaker 501 is directed to the front left of the vehicle, and the sound outlet of the second loudspeaker 502 is directed to the rear left of the vehicle. The plane on which the sound outlet of the first loudspeaker 503 is located and the plane on which the sound outlet of the second loudspeaker 504 are intersected. For another example, the sound production device includes a first loudspeaker 505 and a second loudspeaker 506, and the directions of the sound outlets of the first loudspeaker 505 and the second loudspeaker 506 are different. For example, the sound outlet of the first loudspeaker 501 is directed to the front of the vehicle (the front of the vehicle), and the sound outlet of the second loudspeaker 502 is directed to the front right of the vehicle. The plane on which the sound outlet of the first loudspeaker 505 is located and the plane on which the sound outlet of the second loudspeaker 506 are intersected.

[0123] As shown in (b) of FIG. 5A, a side view of the first loudspeaker 501 and the second loudspeaker 502 in the sound production device is shown, and the sound outlet of the first loudspeaker 501 is directed to the front of the vehicle. For example, the back plate of the first loudspeaker 501 is in complete contact with the back plate of the second loudspeaker 502. For another example, the back plate of the first loudspeaker 501 is in partial contact with the back plate of the second loudspeaker 502. For another example, the back plate of the first loudspeaker 501 is not in contact with the back plate of the second loudspeaker 502, and is located in the same plane.

[0124] It can be understood that the back plate of the first loudspeaker and the back plate of the second loudspeaker in the sound production device are in complete contact, and the first loudspeaker and the second loudspeaker are directed in opposite directions, which is the most space-saving structure.

[0125] In some embodiments of the present application, the sound outlets of the first loudspeaker and the second loudspeaker are oriented in the same direction, and the sound outlets of the first loudspeaker and the second loudspeaker are not located in the same plane. For example, the sound outlets of the first loudspeaker and the second loudspeaker are both oriented towards the front of the vehicle, but the sound outlets of the first loudspeaker and the second loudspeaker are not located in the same plane in the vertical direction, and the first loudspeaker and the second loudspeaker are staggered.

[0126] It can be understood that the staggered arrangement of the sound outlets of the loudspeakers can widen the width of the sound field, reduce sound field deviation, and enhance the stereo effect, so as to enhance the sound effect in the target area.

[0127] For example, as shown in FIG. 5B, which is a structural schematic diagram of the first loudspeaker and the second loudspeaker in the sound generating device, the analog circuit is not shown, and the arrow represents the orientation of the sound outlet. In the case that the sound generating device is applied to a vehicle, the first loudspeaker and the second loudspeaker are closed box loudspeakers, and the sizes of the closed boxes of the first loudspeaker and the second loudspeaker are the same.

[0128] For example, as shown in FIG. 5B, which is a structural schematic diagram of the first loudspeaker and the second loudspeaker in the sound generating device, the analog circuit is not shown, and the arrow represents the orientation of the sound outlet. In the case that the sound generating device is applied to a vehicle, the first loudspeaker and the second loudspeaker are closed box loudspeakers, and the sizes of the closed boxes of the first loudspeaker and the second loudspeaker are the same.

[0129] Optionally, when the first loudspeaker and the second loudspeaker are oriented towards the front of the vehicle, the sound outlets of the first loudspeaker and the second loudspeaker can be located in the same plane.

[0130] For example, as shown in FIG. 5B, which is a structural schematic diagram of the first loudspeaker and the second loudspeaker in the sound generating device, the analog circuit is not shown, and the arrow represents the orientation of the sound outlet. In the case that the sound generating device is applied to a vehicle, the first loudspeaker and the second loudspeaker are closed box loudspeakers, and the sizes of the closed boxes of the first loudspeaker and the second loudspeaker are the same.

[0131] It can be understood that the structures of the first loudspeaker and the second loudspeaker in the sound generating device shown in FIGS. 5A and 5B are only examples. In actual applications, the structure of the first loudspeaker and the second loudspeaker in the sound generating device can be designed differently, and the present application does not limit this.

[0132] It can be understood that the input signal is received by the first sub-circuit and the second sub-circuit in the processing circuit in the present application, and signals with different amplitudes and phases are output, so that the first speaker and the second speaker generate different sound fields. When the sound fields of the first speaker and the second speaker are superimposed together, the desired sound field effect can be formed in the area where the sound generating device is located, and in other areas, the intensity of the sound can be reduced or eliminated due to the interference and superposition effect of the sound waves, thereby reducing the influence on other areas when the sound generating device generates sound.

[0133] It can be understood that the sound generating device generates sound waves by vibration, and the sound waves propagate in the medium (such as air), so that the user hears the sound. The amplitude refers to the amplitude of the sound wave, that is, the intensity of the sound. The amplitude of the signal received by the speaker can be adjusted by the present application, so that the intensity of the sound wave generated by different speakers can be changed, thereby affecting the propagation range and intensity of the sound in space. The phase refers to the position of the vibration waveform in a period relative to a certain reference point (usually the starting point of the waveform), and the phase can represent the vibration state of the sound wave. The phase of the signal received by the speaker can be adjusted by the present application, so that the phase of the sound wave generated by different speakers can be adjusted, thereby changing the mutual superposition of the sound wave in space.

[0134] It should be understood that when two or more sound waves meet, they will interfere and superimpose each other. When sound waves with different phases and amplitudes are superimposed, different superposition effects will be produced. The amplitude and phase of the signal received by the first speaker and the second speaker are adjusted by the processing circuit, thereby controlling the interference and superposition effect of the sound wave generated by the first speaker and the second speaker, controlling the distribution of the sound in space, and realizing the directional emission and precise adjustment of the sound. Thus, the influence on other areas when changing the sound effect experience of the target area is reduced, and local adjustment without interfering with the sound effect experience of other areas is realized.

[0135] It can be understood that the basic modules of the sound generating device provided by the present application are introduced above. The specific circuit structure of the sound generating device is introduced in detail below, with the first speaker and the second speaker of the sound generating device arranged back to back.

[0136] In some examples, the first sub-circuit is configured to output the input signal as a first signal to the first speaker. The second sub-circuit includes an amplification circuit and a phase adjustment circuit, and the phase adjustment circuit is connected between the amplification circuit and the second speaker. The amplification circuit is configured to amplify the amplitude of the input signal, and output the signal after amplification as a first amplified signal to the phase adjustment circuit. The phase adjustment circuit is configured to adjust the phase of the first amplified signal, and output the signal after adjustment as a second signal to the second speaker.

[0137] Among them, the amplification circuit includes a reverse amplification circuit.

[0138] As shown in FIG. 6, FIG. 6 is a structural schematic diagram of another sound generating device 600 provided by an embodiment of the present application. The sound generating device 600 includes a processing circuit 610, a first speaker 620 and a second speaker 630. The processing circuit 610 includes a first sub-circuit 640 and a second sub-circuit 650.

[0139] The first end of the first sub-circuit 640 is configured to receive an input signal. The first sub-circuit 640 takes the input signal as a first signal, and outputs the first signal to the first speaker 620 through the second end of the first sub-circuit 640. For example, the first sub-circuit 640 is a wire.

[0140] It should be understood that, in the embodiments of the present application, based on the signal transmission direction, the end of the electrical component that receives the signal is described as the first end, and the end of the electrical component that outputs the signal is described as the second end.

[0141] The second sub-circuit 650 includes an amplification circuit 660 and a phase adjustment circuit 670. The first end of the amplification circuit 660 is configured to receive the input signal. The amplification circuit 660 is configured to amplify the amplitude of the input signal to obtain a first amplified signal, and transmit the first amplified signal to the phase adjustment circuit 670 through the second end of the amplification circuit 660. The first end of the phase adjustment circuit 670 receives the first amplified signal transmitted from the amplification circuit 660. The phase adjustment circuit 670 is configured to adjust the phase of the first amplified signal to obtain a second signal, and transmit the second signal to the second speaker 630 through the second end of the phase adjustment circuit 670.

[0142] Specifically, the amplification circuit 660 includes a first resistor 661, a second resistor 662 and a first amplifier 663. The first end of the first resistor 661 is configured to receive the input signal, and the second end of the first resistor 661 is connected to the inverting input terminal of the first amplifier 663. The first end of the second resistor 662 is connected to the output terminal of the first amplifier 663, and the second end of the second resistor 662 is connected to the inverting input terminal of the first amplifier 663. The non-inverting input terminal of the first amplifier 663 is grounded, and the output terminal of the first amplifier 663 is connected to the phase adjustment circuit 670.

[0143] Specifically, the phase adjusting circuit 670 includes a third resistor 671, a fourth resistor 672, a fifth resistor 673, a second amplifier 674, and a capacitor 675. A first end of the third resistor 671 is connected to the output end of the first amplifier 663, and a second end of the third resistor 671 is connected to the inverting input end of the second amplifier 674. A first end of the fourth resistor 672 is connected to the output end of the first amplifier 663, and a second end of the fourth resistor 672 is connected to the non-inverting input end of the second amplifier 674. A first end of the fifth resistor 673 is connected to the output end of the second amplifier 674, and a second end of the fifth resistor 673 is connected to the inverting input end of the second amplifier 674. A first end of the capacitor 675 is connected to the second end of the fourth resistor 672, and a second end of the capacitor 675 is grounded. The output end of the second amplifier 674 is connected to the second speaker 630.

[0144] Optionally, the first speaker is closer to the user's ear than the second speaker.

[0145] It can be understood that the above examples describe the connection mode of the electrical elements in each circuit according to the transmission direction of the signal.

[0146] It can be understood that in the above examples, the first sub-circuit in the processing circuit does not process the input signal, and the second sub-circuit performs amplitude amplification processing and phase processing on the input signal. In this way, the amplitudes and phases of the signals received by the first speaker and the second speaker are different, and the first speaker and the second speaker can accurately control the sound field according to the received signal, thereby reducing the impact on other areas when changing the sound effect experience of the target area.

[0147] In some examples, the first sub-circuit includes an amplification circuit configured to perform amplification processing on the amplitude of the input signal and output the amplified signal as the first information to the first speaker. The second sub-circuit includes a phase adjusting circuit configured to adjust the phase of the input signal and output the adjusted signal as the second signal to the second speaker.

[0148] The amplification circuit includes an inverting amplification circuit or a non-inverting amplification circuit.

[0149] The first sub-circuit is an amplification circuit. The first end of the first sub-circuit is configured to receive the input signal, perform amplification processing on the amplitude of the input signal to obtain a first signal, and output the first signal to the first speaker through the second end of the first sub-circuit.

[0150] The second sub-circuit is a phase adjusting circuit. The first end of the second sub-circuit is configured to receive the input signal, adjust the phase of the input signal to obtain a second signal, and output the second signal to the second speaker through the second end of the second sub-circuit.

[0151] As shown in FIG. 7, FIG. 7 is a structural schematic diagram of another sound production apparatus 700 provided by an embodiment of the present application. The sound production apparatus 700 includes a processing circuit 710, a first speaker 720 and a second speaker 730. The processing circuit 710 includes a first sub-circuit 740 and a second sub-circuit 750.

[0152] Specifically, the amplification circuit 760 (i.e., the first sub-circuit 740) includes a first resistor 761, a second resistor 762 and a first amplifier 763. The first end of the second resistor 762 is configured to receive an input signal, and the second end of the second resistor 762 is connected to the inverting input terminal of the first amplifier 763. The first end of the first resistor 761 is connected to the output terminal of the first amplifier 763, and the second end of the first resistor 761 is connected to the inverting input terminal of the first amplifier 763. The non-inverting input terminal of the first amplifier 763 is grounded, and the output terminal of the first amplifier 763 is connected to the first speaker 720.

[0153] Specifically, the phase adjustment circuit 770 (i.e., the second sub-circuit 750) includes a third resistor 771, a fourth resistor 772, a fifth resistor 773, a second amplifier 774 and a capacitor 775. The first end of the third resistor 771 is configured to receive an input signal, and the second end of the third resistor 771 is connected to the inverting input terminal of the second amplifier 774. The first end of the fourth resistor 772 is configured to receive an input signal, and the second end of the fourth resistor 772 is connected to the non-inverting input terminal of the second amplifier 774. The first end of the fifth resistor 773 is connected to the output terminal of the second amplifier 774, and the second end of the fifth resistor 773 is connected to the inverting input terminal of the second amplifier 774. The first end of the capacitor 775 is connected to the second end of the fourth resistor 772, and the second end of the capacitor 775 is grounded. The output terminal of the second amplifier 774 is connected to the second speaker 730.

[0154] Optionally, the first speaker is closer to the user's ear than the second speaker.

[0155] As shown in FIG. 8, FIG. 8 is a structural schematic diagram of another sound production apparatus 800 provided by an embodiment of the present application. The sound production apparatus 800 includes a processing circuit 810, a first speaker 820 and a second speaker 830. The processing circuit 810 includes a first sub-circuit 840 and a second sub-circuit 850.

[0156] Specifically, the amplification circuit 860 (i.e., the first sub-circuit 840) includes a first resistor 861, a second resistor 862, and a first amplifier 863. The non-inverting input terminal of the first amplifier 863 is configured to receive the input signal, and the output terminal of the first amplifier 863 is connected to the first terminal of the first resistor 861. The second terminal of the first resistor 861 is connected to the first terminal of the second resistor 862, and the second terminal of the first resistor 861 is also connected to the inverting input terminal of the first amplifier 863. The second terminal of the second resistor 862 is grounded. The output terminal of the first amplifier 863 is connected to the first speaker 820.

[0157] Specifically, the phase adjustment circuit 870 (i.e., the second sub-circuit 850) includes a third resistor 871, a capacitor 872, a fourth resistor 873, a fifth resistor 874, and a second amplifier 875. The first terminal of the third resistor 871 is configured to receive the input signal, and the second terminal of the third resistor 871 is connected to the inverting input terminal of the second amplifier 875. The first terminal of the capacitor 872 is configured to receive the input signal, and the second terminal of the capacitor 872 is connected to the non-inverting input terminal of the second amplifier 875. The second terminal of the capacitor 872 is connected to the first terminal of the fourth resistor 873, and the second terminal of the fourth resistor 873 is grounded. The output terminal of the second amplifier 875 is connected to the first terminal of the fifth resistor 874, and the second terminal of the fifth resistor 874 is connected to the inverting input terminal of the second amplifier 875. The output terminal of the second amplifier 875 is connected to the second speaker 830.

[0158] Optionally, the first speaker is closer to the user's ear than the second speaker.

[0159] It can be understood that, in the above examples, the first sub-circuit in the processing circuit performs amplitude amplification processing on the input signal, and the second sub-circuit performs phase processing on the input signal. In this way, the amplitudes and phases of the signals received by the first speaker and the second speaker are different, and the first speaker and the second speaker can accurately control the sound field according to the received signals, thereby reducing the influence on other areas when changing the sound effect experience of the target area.

[0160] In the embodiments of the present application, the amplification circuit in the sound generating device 600 and the sound generating device 700 can be implemented by an inverting amplifier. The amplification circuit in the sound generating device 800 can be implemented by a non-inverting amplifier.

[0161] In the embodiments of the present application, the ratio of the first resistor to the second resistor is in the range of 1-10.

[0162] In the embodiments of the present application, the phase adjustment circuit in the sound generating device 600, the sound generating device 700, and the sound generating device 800 can be implemented by an all-pass phase shifter.

[0163] In this embodiment, the third, fourth, and fifth resistors have the same resistance value, and the product of the resistance value of the third resistor and the capacitance value of the capacitor ranges from 1 × 10⁻⁶. –5 seconds - 1 × 10 –3 Second.

[0164] Based on the examples in Figures 6-8 above, in the embodiments of this application, the sound-generating device may further include a first power amplifier and a second power amplifier.

[0165] In this circuit, one end of the first power amplifier is connected to the first sub-circuit, and the other end is connected to the first speaker. One end of the second power amplifier is connected to the second sub-circuit, and the other end is connected to the second speaker.

[0166] For example, based on the sound-generating device in Figure 6 above, see Figure 9, which is a schematic diagram of the structure after adding a first power amplifier and a second power amplifier to the sound-generating device.

[0167] It is understood that the above example uses a sound-generating device with two speakers as an illustration. In actual use, the sound-generating device can include a greater number of speakers to improve more precise sound effect control.

[0168] In the embodiments of this application, the sound-generating device may further include a third loudspeaker.

[0169] Correspondingly, the processing circuit in the sound-generating device also includes a third sub-circuit, which receives the input signal, outputs a third signal, and provides the third signal to the third loudspeaker.

[0170] The amplitudes and phases of the third, second, and first signals are all different.

[0171] As exemplarily shown in Figure 10, a structural schematic diagram of a sound-generating device 1000 including three speakers is presented. The sound-generating device 1000 includes a processing circuit, a first speaker, a second speaker, and a third speaker. The sound outlets of the first speaker, the second speaker, and the third speaker all face the roof of the vehicle.

[0172] The processing circuit includes a first sub-circuit, a second sub-circuit, and a third sub-circuit. The first sub-circuit is connected to the first speaker, the second sub-circuit is connected to the second speaker, and the third sub-circuit is connected to the third speaker. The connection method between the first sub-circuit and the first speaker is shown in Figure 6 above for the sound-generating device 600.

[0173] The second sub-circuit comprises an amplification circuit 1 and a phase adjustment circuit 1, the amplification circuit 1 comprises a first resistor 1, a second resistor 1 and a first amplifier 1; the phase adjustment circuit comprises a third resistor 1, a fourth resistor 1, a fifth resistor 1, a second amplifier 1 and a capacitor 1. The connection mode of each electrical element in the second sub-circuit and the connection mode of the second sub-circuit and the second speaker are described above with reference to the sound generating device 600 shown in Fig. 6.

[0174] The third sub-circuit of the sound generating device 1000 is connected to the output end of the second sub-circuit at one end and connected to the third speaker at the other end. That is, the third sub-circuit receives the signal processed by the second sub-circuit, and the signal is transmitted to the third speaker after being processed by the third sub-circuit. The third sub-circuit comprises an amplification circuit 2 and a phase adjustment circuit 2, the amplification circuit 2 comprises a first resistor 2, a second resistor 2 and a first amplifier 2; the phase adjustment circuit comprises a third resistor 2, a fourth resistor 2, a fifth resistor 2, a second amplifier 2 and a capacitor 2. The connection mode of the electrical elements in the third sub-circuit is the same as that of the electrical elements in the second sub-circuit.

[0175] It can be understood that the sound generating device described above is only an example, and the specific implementation mode of the sound generating device is not limited by the embodiments of the present application.

[0176] The embodiments of the present application also provide a headrest system, which comprises a headrest and the sound generating device provided by the embodiments of the present application, and the sound generating device is arranged close to the headrest.

[0177] In some examples, the headrest system comprises a headrest and one or more sound generating devices, and the headrest further comprises a buffer body provided with one or more mounting holes, and the sound generating device is arranged in the mounting hole.

[0178] For example, the headrest system comprises a headrest and two sound generating devices, and the left and right sides of the buffer body of the headrest are respectively provided with a mounting hole, and one sound generating device is arranged in each mounting hole. In this way, there is one sound generating device on each of the left and right sides of the headrest.

[0179] The embodiments of the present application also provide a seat, which comprises the sound generating device provided by the embodiments of the present application.

[0180] The embodiments of the present application also provide a vehicle, which comprises at least one of the sound generating device provided by the embodiments of the present application, the headrest system provided by the embodiments of the present application or the seat provided by the embodiments of the present application.

[0181] It can be understood that the basic structure of the sound generating device is introduced above, and the design method of the parameters of the sound generating device in the headrest system when the sound generating device is applied to the headrest system is introduced in detail below. Referring to Fig. 11, it is a flowchart of a sound generating device design method provided by the embodiments of the present application.

[0182] The headrest system is installed on the seat in the co-driver area, and the headrest system includes two sound generating devices. For example, the two sound generating devices are respectively arranged on the left and right sides of the headrest. The design method of each component of the sound generating device in the headrest system is described. For example, the headrest system includes sound generating device 1 and sound generating device 2. The sound generating device 1 is arranged on the left side of the headrest, and the sound generating device 2 is arranged on the right side of the headrest. The two speakers in the sound generating device 1 and the sound generating device 2 are arranged back to back. Each speaker is a closed speaker, and the speaker models are consistent.

[0183] S1100, obtain vehicle data, and determine the size of the cabinet of each speaker in the sound generating device according to the vehicle data.

[0184] In some examples, the vehicle data is the cabin data of the vehicle. For example, through a three-dimensional scanning technology or from the vehicle manufacturer to obtain the three-dimensional model data of the vehicle cabin. The size of the headrest in the vehicle cabin is determined according to the vehicle data, and the size of the cabinet of each speaker in the sound generating device is determined based on the size of the headrest.

[0185] In some examples, the sound generating device is arranged in the headrest, and the size of the cabinet of the speaker in the sound generating device is determined according to the size of the headrest in the headrest system of the co-driver seat. For example, the headrest is divided into three areas, the left and right areas are arranged with the sound generating device, and the middle area supports the user's head. The size of the sound generating device is determined according to the size of the headrest, and the size of the cabinet of the speaker unit is determined according to the size of the sound generating device. For example, as shown in FIG. 12, the size of the sound generating device on the left and right sides of the headrest is determined according to the size of the headrest, which is LxWxH, wherein L, W and H are positive numbers. Since the two speakers in the sound generating device are arranged back to back, the speaker models are consistent. The size of the cabinet of each speaker in the sound generating device is Lx(W / 2)xH.

[0186] In other examples, the sound generating device is arranged outside the headrest, and the size of the cabinet of the speaker in the sound generating device is determined according to the size of the headrest in the headrest system of the co-driver seat and the size of the space on the left and right sides of the headrest. For example, the width and height of the sound generating device are determined according to the width and height of the headrest. The width of the sound generating device is less than or equal to the width of the headrest, and the height of the sound generating device is less than or equal to the width of the headrest. The length of the sound generating device is determined according to the distance from the right side of the headrest to the co-driver door, and the length of the sound generating device is less than the distance from the right side of the headrest to the co-driver door. In this way, the size of the sound generating device is determined, and the size of the cabinet of the speaker is determined according to the size of the sound generating device.

[0187] It can be understood that the size of the cabinet of the speaker is determined according to the cabin environment of the vehicle, the size of the cabinet can be determined according to the size of the speaker unit in the sound generating device, and then it is determined which kind of speaker unit is used in the sound generating device. For example, the speaker unit is a moving coil speaker.

[0188] S1101, determine a target area, a non-target area, a target demand, and an input signal.

[0189] The target area is an area in the vehicle cabin where the sound field needs to be controlled to improve the sound experience. The non-target area is an area in the vehicle cabin outside the target area. The sound device can control the sound field in the target area when it sounds, improve the sound experience of users in the target area, and reduce the impact on the non-target area. For example, the target area is the co-pilot area, and the non-target area is the driver area and the rear area.

[0190] In some examples, the target area can be an area determined by the user. For example, the user triggers the sound device in the headrest system of the co-pilot seat to play music.

[0191] In other examples, the target area can be an area determined by the vehicle controller that needs to improve the sound effect. For example, the vehicle controller obtains the noise in each area of the vehicle cabin detected by the microphone sensor, and if it is determined that the noise in a certain area exceeds a predetermined threshold, it sends an input signal to the sound device in the headrest system of the area to reduce the noise in the area.

[0192] The target demand is a preset sound effect result that the target area should achieve when the sound device in the target area sounds. For example, the target demand includes target operation and target frequency band, etc. For example, the target operation is noise reduction, and the target frequency band is 88-707Hz. The target demand can be understood as the sound frequency in the co-pilot area when the sound frequency in the target frequency band range is processed.

[0193] The input signal is a signal input to the sound device. For example, the input signal is white noise.

[0194] Optionally, the input signal includes an input signal 1 input to the left sound device in the headrest system and an input signal 2 input to the right sound device in the headrest system. The input signal 1 and the input signal 2 are the same or different.

[0195] It can be understood that according to the target area and the non-target area, the area that should be covered by the sound device when it sounds and the area that needs to reduce the radiation sound energy can be determined. According to the target demand, the use demand of the sound device can be determined, and the parameters of each component of the sound device can be designed based on the target demand to ensure that the sound device can effectively meet the user's use expectation.

[0196] S1102, determine an electro-acoustic transfer function of each loudspeaker to each measurement point in the target area and an electro-acoustic transfer function of each loudspeaker to each measurement point in the non-target area.

[0197] In some examples, the target area and the non-target area can set measurement points to detect the sound pressure when each loudspeaker emits sound, and then determine the electroacoustic transfer function of each loudspeaker to each measurement point.

[0198] As shown in FIG. 13, which is a top view of the vehicle, the two side of the headrest in the front passenger area are provided with sound emitting devices, and the headrest and the two sound emitting devices constitute a headrest system. The two sound emitting devices are constructed identically, and each sound emitting device includes two closed loudspeakers arranged back to back, with the sound outlet of one closed loudspeaker facing the front of the vehicle and the sound outlet of the other closed loudspeaker facing the rear of the vehicle.

[0199] The user can feel the sound effect in the vehicle cabin when he or she is in the vehicle, and therefore, the measurement points are set according to the positions of the user's ears in the vehicle cabin. In FIG. 13, the black circles are the measurement points in the vehicle cabin, the front passenger area includes two measurement points, the driver area includes two measurement points, and the rear area includes multiple measurement points. It should be understood that the measurement points in FIG. 13 are only an example, and in actual applications, the vehicle cabin can include more or fewer measurement points, which are not limited by comparison in this application.

[0200] According to the preset circuit, the electroacoustic transfer function of each loudspeaker to each measurement point is determined.

[0201] The preset circuit is a processing circuit used when designing the sound emitting device, and the processing circuit can be any one of the processing circuits in FIGS. 6, 7, or 8. The multiple sound emitting devices in the headrest system can use the same processing circuit or different processing circuits.

[0202] It can be understood that the application scenario of this application is the vehicle cabin, and when designing the circuit in the vehicle cabin, the circuit used for a near-field sound source in a free space can be referred to.

[0203] For example, the circuit data (such as the voltage ratio formula in the circuit) of a central directivity sound source designed in a free space is applied to the vehicle cabin scenario, and a preliminary preset circuit is constructed based on the circuit data. Subsequently, after the preset circuit is determined, the preset circuit is actually tested and experimented to evaluate the performance of the preset circuit in the vehicle cabin. The preset circuit is adjusted or optimized according to the test results, and the optimal circuit parameters of the preset circuit are determined according to the test results when the target requirements are met. The circuit design of the actual product is constructed according to the optimal circuit parameters, to ensure stable operation in the vehicle cabin and achieve the expected acoustic effect and meet the user's use requirements.

[0204] For example, the two sound emitting devices in FIG. 13 use the processing circuit shown in FIG. 6. That is, the loudspeaker with the sound outlet facing the front of the vehicle in each sound emitting device is connected to the first sub-circuit, and the loudspeaker with the sound outlet facing the rear of the vehicle is connected to the second sub-circuit.

[0205] For the speaker with the left side sound outlet of the headrest facing the front of the vehicle, the speaker is controlled to emit sound by the first sub-circuit according to the input voltage 1 corresponding to the input signal 1 in S1101. Each measuring point in the vehicle cabin detects the sound pressure when the speaker emits sound. The ratio of the sound pressure detected by each measuring point to the input voltage 1 is determined as the electroacoustic transfer function of the speaker to each measuring point. For example, the input voltage 1 is V1, and the sound pressure detected by the left ear measuring point of the front passenger when the speaker emits sound is p, then the electroacoustic transfer function (denoted by z) of the speaker with the left side sound outlet of the headrest facing the front of the vehicle to the left ear measuring point is z = p / V1.

[0206] It can be understood that when determining the electroacoustic transfer function of the speaker with the left side sound outlet of the headrest facing the front of the vehicle, the circuit in the processing circuit connected to the speaker with the left side sound outlet of the headrest facing the front of the vehicle (i.e. the first sub-circuit) is powered on, and other circuits (i.e. the second sub-circuit) are not powered on.

[0207] For the speaker with the left side sound outlet of the headrest facing the front of the vehicle, the speaker is controlled to emit sound by the first sub-circuit according to the input voltage 1 corresponding to the input signal 1 in S1101. Each measuring point in the vehicle cabin detects the sound pressure when the speaker emits sound. The ratio of the sound pressure detected by each measuring point to the input voltage 1 is determined as the electroacoustic transfer function of the speaker to each measuring point.

[0208] Correspondingly, the two speakers on the right side of the headrest determine their own electroacoustic transfer functions to each measuring point by the above method. For the speaker with the left side sound outlet of the headrest facing the front of the vehicle, the speaker is controlled to emit sound by the first sub-circuit according to the input voltage 2 corresponding to the input signal 2 in S1101. Each measuring point in the vehicle cabin detects the sound pressure when the speaker emits sound. The ratio of the sound pressure detected by each measuring point to the input voltage 2 is determined as the electroacoustic transfer function of the speaker to each measuring point. For the speaker with the left side sound outlet of the headrest facing the front of the vehicle, the speaker is controlled to emit sound by the first sub-circuit according to the input voltage 2 corresponding to the input signal 2 in S1101. Each measuring point in the vehicle cabin detects the sound pressure when the speaker emits sound. The ratio of the sound pressure detected by each measuring point to the input voltage 2 is determined as the electroacoustic transfer function of the speaker to each measuring point.

[0209] It can be understood that when determining the electroacoustic transfer function of each speaker to each measuring point, the input voltage corresponding to the input signal of the same sound emitting device is the same. The voltage received by each speaker is determined according to the circuit connected to the speaker. By measuring the electroacoustic transfer function of each speaker to each measuring point, the transmission of sound in the vehicle interior can be determined, so as to accurately determine the circuit parameters in the processing circuit subsequently.

[0210] It can be understood that the above electro-acoustic transfer function can be determined by simulation experiment, and can be determined by real vehicle test, and the specific determination manner of the electro-acoustic transfer function is not limited in the embodiments of the present application.

[0211] S1103, determining the circuit parameter in the preset circuit according to the electro-acoustic transfer function of each measuring point in the target area and the electro-acoustic transfer function of each measuring point in the non-target area.

[0212] According to the preset circuit, the ratio of the voltages received by the two loudspeakers in each sound device in the headrest system is determined. For example, based on the circuit shown in FIG. 6, the ratio (also described as the voltage ratio) of the voltages received by the loudspeaker with the sound outlet facing the front of the vehicle and the loudspeaker with the sound outlet facing the rear of the vehicle in the sound device is determined according to the following formula 1.

[0213] Wherein, r is the voltage ratio of the loudspeaker with the sound outlet facing the front of the vehicle and the loudspeaker with the sound outlet facing the rear of the vehicle, V f is the voltage received by the loudspeaker with the sound outlet facing the front of the vehicle in the sound device, V b is the voltage received by the loudspeaker with the sound outlet facing the rear of the vehicle in the sound device. R1 is the resistance value of the first resistor, R2 is the resistance value of the second resistor. R is the resistance value of the third resistor, the fourth resistor and the fifth resistor, and the resistance values of the third resistor, the fourth resistor and the fifth resistor are the same. jωCR is the capacitive reactance of the capacitor in the circuit, C is the capacitance value of the capacitor, ω represents the angular frequency, ω = 2πf, f represents the frequency, and j represents the imaginary unit.

[0214] For example, according to the above formula 1, the voltage ratio received by the loudspeaker in the left sound device in the headrest system is r1, and the voltage ratio received by the loudspeaker in the right sound device is r2.

[0215] It can be understood that the voltage received by each loudspeaker in different processing circuits in the sound device is determined by the circuit connected to the loudspeaker.

[0216] For the processing circuit shown in FIG. 6 and the example of S1101, the circuit (i.e. the first sub-circuit) connected to the loudspeaker with the sound outlet facing the front of the vehicle does not contain other electrical elements such as resistors and capacitors. Therefore, the voltage received by the loudspeaker with the sound outlet facing the front of the vehicle is the input voltage corresponding to the input signal. That is, the input voltage received by the loudspeaker with the sound outlet facing the front of the vehicle is constant, and the input voltage is the voltage received by the loudspeaker. The circuit connected to the loudspeaker with the sound outlet facing the rear of the vehicle contains other electrical elements such as resistors and capacitors, and the voltage received by the loudspeaker with the sound outlet facing the rear of the vehicle is determined according to the connection mode of the electrical elements.

[0217] For example, the input voltage input to the sound device is V0, then Vf = V0; Wherein, various parameters refer to the above, here will not be elaborated.

[0218] For example, the input voltage of the left sound device in the headrest system is V f1 The voltage received by the speaker of the left sound device with the sound outlet facing the car head is V f1 The voltage received by the speaker of the left sound device with the sound outlet facing the car tail is V f1 / r1. The input voltage of the right sound device in the headrest system is V f2 The voltage received by the speaker of the right sound device with the sound outlet facing the car head is V f2 The voltage received by the speaker of the right sound device with the sound outlet facing the car tail is V f2 / r2.

[0219] In the embodiment of the present application, the sound pressure of each measurement point is determined according to the product of the electroacoustic transfer function of each speaker to the measurement point and the voltage received by the speaker. The arithmetic square root of the average value of the square of the sound pressure of each measurement point (which can also be described as the root mean square of the sound pressure of each measurement point) is determined as the average sound pressure of the region.

[0220] Specifically, the average sound pressure of the target region is calculated according to the electroacoustic transfer function of each speaker to the measurement point of the target region and the voltage received by each speaker.

[0221] According to the above example, the target region (the co-driver region) includes two measurement points, the left measurement point and the right measurement point. Taking the example that the input voltages received by the left and right sound devices in the headrest system are the same, the average sound pressure of the target region is calculated according to the following formula 2.

[0222] Wherein, r t1 is the coordinate of the left measurement point, r t2 is the coordinate of the right measurement point. f represents the sound outlet of the speaker facing the car head, and b represents the sound outlet of the speaker facing the car tail. p t is the average sound pressure of the target region. p(r t1 ) is the sound pressure of the left measurement point, and p(r t2 ) is the sound pressure of the right measurement point. z f1 (r t1 ) is the electroacoustic transfer function of the speaker with the sound outlet facing the car head in the left sound device to the left measurement point, z b1 (r t1 ) is the electroacoustic transfer function of the speaker with the sound outlet facing the car tail in the left sound device to the left measurement point; z f2 (r t1) is the electroacoustic transfer function from the speaker with its sound outlet facing the front of the vehicle to the left measurement point in the right sound-emitting device. b2 (r t1 ) is the electroacoustic transfer function from the speaker with its sound outlet facing the back of the vehicle to the left measurement point in the right sound-emitting device. f1 (r t2 ) is the electroacoustic transfer function from the speaker with its sound outlet facing the front of the vehicle to the right measurement point in the left sound-emitting device. b1 (r t2 ) is the electroacoustic transfer function from the speaker with its sound outlet facing the back of the vehicle to the right measurement point in the left sound-emitting device. f2 (r t2 ) is the electroacoustic transfer function from the speaker with its sound outlet facing the front of the vehicle to the right measurement point in the right sound-emitting device. b2 (r t2 ) is the electroacoustic transfer function from the speaker with its sound outlet facing the back of the vehicle to the right measurement point in the right sound-emitting device. f1 is the voltage received by the speaker with its sound outlet facing the front of the vehicle in the left sound-emitting device, V f1 is the voltage received by the speaker with its sound outlet facing the back of the vehicle in the left sound-emitting device, V f2 is the voltage received by the speaker with its sound outlet facing the front of the vehicle in the right sound-emitting device, V f2 is the voltage received by the speaker with its sound outlet facing the back of the vehicle in the right sound-emitting device, and the superscript T indicates the transpose of the matrix.

[0223] Specifically, the average sound pressure of the non-target region is calculated according to the electroacoustic transfer function of each speaker to the measurement point in the non-target region and the voltage received by each speaker.

[0224] According to the above example, the non-target region (the driving region and the rear row region) includes M measurement points, and M is a positive integer. The average sound pressure of the non-target region is calculated according to the following formula 3.

[0225] wherein r u1 , r u2 , …, r uM are the coordinates of the M measurement points in the non-target region, such as measurement point 1, measurement point 2, …, measurement point M. f represents that the sound outlet of the speaker faces the front of the vehicle, and b represents that the sound outlet of the speaker faces the back of the vehicle. u is the average sound pressure of the non-target region. p(r u1 ) is the sound pressure of measurement point 1, p(r u2 ) is the sound pressure of measurement point 2, …, and p(r uM ) is the sound pressure of measurement point M. f1 (r u1H1(z) is an electroacoustic transfer function from the loudspeaker with the sound outlet oriented towards the car head to the measuring point 1 in the left sound-emitting device, z b1 (r u1 H1(z) is an electroacoustic transfer function from the loudspeaker with the sound outlet oriented towards the car head to the measuring point 1 in the left sound-emitting device, z f2 (r u1 H1(z) is an electroacoustic transfer function from the loudspeaker with the sound outlet oriented towards the car head to the measuring point 1 in the left sound-emitting device, z b2 (r u1 H1(z) is an electroacoustic transfer function from the loudspeaker with the sound outlet oriented towards the car head to the measuring point 1 in the left sound-emitting device, z f1 (r u2 H1(z) is an electroacoustic transfer function from the loudspeaker with the sound outlet oriented towards the car head to the measuring point 1 in the left sound-emitting device, z b1 (r u2 H1(z) is an electroacoustic transfer function from the loudspeaker with the sound outlet oriented towards the car head to the measuring point 1 in the left sound-emitting device, z f2 (r u2 H1(z) is an electroacoustic transfer function from the loudspeaker with the sound outlet oriented towards the car head to the measuring point 1 in the left sound-emitting device, z b2 (r u2 H1(z) is an electroacoustic transfer function from the loudspeaker with the sound outlet oriented towards the car head to the measuring point 1 in the left sound-emitting device, z f1 (r uM H1(z) is an electroacoustic transfer function from the loudspeaker with the sound outlet oriented towards the car head to the measuring point 1 in the left sound-emitting device, z f1 (r uM H1(z) is an electroacoustic transfer function from the loudspeaker with the sound outlet oriented towards the car head to the measuring point 1 in the left sound-emitting device, z f2 (r uM H1(z) is an electroacoustic transfer function from the loudspeaker with the sound outlet oriented towards the car head to the measuring point 1 in the left sound-emitting device, z b2 (r uM H1(z) is an electroacoustic transfer function from the loudspeaker with the sound outlet oriented towards the car head to the measuring point 1 in the left sound-emitting device, z f1 V1 is a voltage received by the loudspeaker with the sound outlet oriented towards the car head in the left sound-emitting device, V f1 V1 is a voltage received by the loudspeaker with the sound outlet oriented towards the car head in the left sound-emitting device, V f2 V1 is a voltage received by the loudspeaker with the sound outlet oriented towards the car head in the left sound-emitting device, V f2 V1 is a voltage received by the loudspeaker with the sound outlet oriented towards the car head in the left sound-emitting device, V

[0226] After determining the average sound pressure of the target area and the average sound pressure of the non-target area, the average sound pressure difference between the target area and the non-target area is calculated according to the following formula 4.

[0227] wherein, ΔSPL is the average sound pressure difference between the target region and the non-target region, M is the number of measurement points in the non-target region, and 2 is the number of measurement points in the target region.p t is the average sound pressure of the target region, and p u is the average sound pressure of the non-target region.

[0228] By traversing, the R1 / R2 and CR values that can be used by the left sound generating device and the R1 / R2 and CR values that can be used by the right sound generating device are substituted into the above formula to calculate the circuit parameters of the preset circuit of the left sound generating device and the circuit parameters of the preset circuit of the right sound generating device. When the corresponding average sound pressure difference between the target region and the non-target region is the largest, the circuit parameters of the left sound generating device are determined as the circuit parameters of the preset circuit of the left sound generating device, and the circuit parameters of the right sound generating device are determined as the circuit parameters of the preset circuit of the right sound generating device.

[0229] It should be understood that the largest average sound pressure difference between the target region and the non-target region indicates that the acoustic effect produced by the circuit parameters used at this time is the best.

[0230] For example, as shown in FIG. 14, when the circuit parameters used by the left sound generating device and the right sound generating device in the headrest system are consistent, the simulated relationship between the circuit parameters and the average sound pressure difference between the target region and the non-target region is shown. As can be seen, the value range of R1 / R2 is 0-10, the value range of CR (unit: second / s) is 1x10 –5 -1x10 –3 , and the value range of the average sound pressure difference (unit: decibel / dB) is 0-20. As shown in FIG. 14, as R1 / R2 and CR increase, the average sound pressure level difference between the target region and the non-target region first increases sharply, and then slowly decreases to a convergent value.

[0231] For example, according to the graph shown in FIG. 14, the circuit parameters corresponding to the largest average sound pressure level difference between the target region and the non-target region are obtained.

[0232] It should be understood that there can be one or more circuit parameters at which the average sound pressure level difference between the target region and the non-target region is maximum, but the average sound pressure level difference between the target region and the non-target region is affected by the cabin environment, and if the environment changes, the sound generating device using the circuit parameter can not be able to provide the optimal acoustic effect. The circuit parameter can adopt a value within a certain preset range, such as the circuit parameter corresponding to the average sound pressure level difference between the target region and the non-target region being greater than a certain threshold value. The preset range provides a certain fault tolerance, that is, even if the environment of the sound generating device or the electrical elements of the sound generating device are aged or deviate from the design value, as long as the circuit parameter of the sound generating device is still within the preset range, the performance of the sound generating device will not be significantly affected. Moreover, electrical elements within the preset range can be used, and there is no need to strictly screen electrical elements of specific values during the production process, thereby simplifying the production process.

[0233] For example, according to the image shown in FIG. 14, the circuit parameter at which the average sound pressure level difference between the target region and the non-target region is greater than a certain value (such as 15 dB) is obtained, and a circuit parameter value diagram as shown in FIG. 15 is obtained. As shown in FIG. 15, the shadow region corresponds to the circuit parameter when the average sound pressure level difference between the target region and the non-target region is greater than 15 dB, wherein the value range of R1 / R2 is 1.3-5.7, and the value range of CR is 1.5x10 –4 -7x10 –4 Subsequently, the specific values in the circuit parameters of the left sound generating device and the circuit parameters of the right sound generating device can adopt values in the above ranges.

[0234] It can be understood that the circuit parameters adopted by the left sound generating device and the right sound generating device in the headrest system in the above examples are consistent. In actual tests, the circuit parameters adopted by the left sound generating device and the right sound generating device in the headrest system can be different.

[0235] It should be understood that in actual applications, due to factors such as the shape of the cabin, the placement of the sound generating device, or the acoustic characteristics, the circuit parameters adopted by the left sound generating device and the right sound generating device in the headrest system are mostly inconsistent.

[0236] For example, when the circuit parameter in the left sound generating device is R1 / R2=1.7, CR=4.6x10 –4 s, and the circuit parameter in the right sound generating device is R1 / R2=2.9, CR=3.4x10 –4 s, the average sound pressure difference between the target region and the non-target region is maximum. Subsequently, the preset circuit of the left sound generating device and the preset circuit of the right sound generating device can be designed according to the circuit parameter.

[0237] It can be understood that in actual application, the circuit parameters of the sound generating devices on the left and right sides of the headrest system are determined according to specific application scenarios, and the circuit parameters of the sound generating devices used in different vehicle cabins are the same or different.

[0238] S1104, constructing the sound generating device according to the circuit parameters.

[0239] Based on the determined circuit parameters, a processing circuit is constructed, and the processing circuit is connected with the corresponding loudspeakers to form the sound generating device.

[0240] In this way, the design of the sound generating device in the headrest system is completed through the above steps, and the sound generating device can be directly used subsequently, thereby reducing the influence on other areas when changing the sound effect experience of the target area.

[0241] It can be understood that the above examples are set by taking the processing circuit in FIG. 6 as an example, and in actual application, the processing circuit in FIG. 7 or FIG. 8 can also be designed. When designing the sound generating device based on other processing circuits, since the circuit structures are different, the voltage ratios received by the loudspeakers with sound outlets facing the front of the vehicle and the loudspeakers with sound outlets facing the rear of the vehicle in the sound generating device are also different. Only the voltage ratio is changed in the design process, and the other design procedures remain unchanged.

[0242] It can be understood that according to the above description, the voltage received by each loudspeaker in the sound generating device in different processing circuits is determined by the circuit connected to the loudspeaker. Therefore, the voltage received by each loudspeaker in the sound generating device is also different when the processing circuit is different.

[0243] Correspondingly, for the processing circuit shown in FIG. 7, based on the example in S1103 above, the input voltage input to the sound generating device is V0, then wherein various parameters are described above and will not be repeated here.

[0244] For the processing circuit shown in FIG. 7, the voltage ratio received by the loudspeaker with the sound outlet facing the front of the vehicle and the loudspeaker with the sound outlet facing the rear of the vehicle in the sound generating device is the same as formula 1 above.

[0245] Correspondingly, for the processing circuit shown in FIG. 8, based on the example in S1103 above, the input voltage input to the sound generating device is V0, then wherein various parameters are described above and will not be repeated here.

[0246] For the processing circuit shown in FIG. 8, the voltage ratio received by the loudspeaker with the sound outlet facing the front of the vehicle and the loudspeaker with the sound outlet facing the rear of the vehicle in the sound generating device can be determined by formula 5.

[0247] wherein r is the voltage ratio received by the loudspeaker with the sound outlet facing the front of the vehicle and the loudspeaker with the sound outlet facing the rear of the vehicle, Vf V0 is the voltage received by the speaker of the sound production device whose sound outlet is towards the front of the vehicle b V0 is the voltage received by the speaker of the sound production device whose sound outlet is towards the front of the vehicle; R1 is the resistance value of the first resistor, R2 is the resistance value of the second resistor, R is the resistance value of the third resistor, the fourth resistor and the fifth resistor, the resistance value of the third resistor, the fourth resistor and the fifth resistor are the same. jωCR is the capacitive reactance of the capacitor in the circuit, C is the capacitance of the capacitor, ω represents the angular frequency, ω = 2πf, f represents the frequency, and j represents the imaginary unit.

[0248] It can be understood that the above examples are described by taking the sound production device including two speakers as an example. If the sound production device includes multiple speakers, the proportion of the received voltage of each speaker is determined according to the connection mode of the processing circuit in each sound production device.

[0249] Correspondingly, for the processing circuit shown in FIG. 10, based on the example in S1103 above, if the values of the electrical elements in the second sub-circuit and the values of the electrical elements in the third sub-circuit are the same, the input voltage input to the sound production device is V0, then the voltage V1 received by the first speaker is V0, and the voltage V2 received by the second speaker is The voltage received by the third speaker is Wherein, various parameters are described above, which will not be repeated here.

[0250] For example, as shown in FIG. 16, (a) in FIG. 16 is a sound pressure level distribution diagram in the vehicle cabin when the sound production device of the headrest system sounds before the headrest system provided by the present application is used by the co-driver seat. The vehicle cabin includes a driver area 1601, a co-driver area 1602 and a rear area 1603. (b) in FIG. 16 is a sound pressure level distribution diagram in the vehicle cabin when the sound production device of the headrest system sounds after the headrest system provided by the present application is used by the co-driver seat. The vehicle cabin includes a driver area 1604, a co-driver area 1605 and a rear area 1606. It can be seen that after using the headrest system provided by the present application, the sound pressure level of the rear area and the driver area decreases obviously, and the average sound pressure level difference between the co-driver area and other areas is greater than that before using the headrest system. The headrest system provided by the present application can significantly reduce the influence on the non-target area.

[0251] The above mainly introduces the scheme provided by the embodiments of the present application from the method aspect. To achieve the above functions, it contains the hardware structure and / or software module corresponding to the execution of each function. Those skilled in the art should easily realize that, in combination with the units and algorithm steps of the examples described in the embodiments disclosed in the present application, the present application can be realized in the form of hardware or the combination of hardware and computer software. Whether a certain function is realized in the form of hardware or computer software driving hardware depends on the specific application and design constraints of the technical solution. The skilled person can use different methods to realize the described functions for each specific application, but such implementation should not be considered beyond the scope of the present application.

[0252] Based on the same inventive concept, the embodiments of the present application provide a sound generating device design apparatus. As shown in FIG. 17, it is a structural schematic diagram of a sound generating device design apparatus provided by the embodiments of the present application. For example, the sound generating device design apparatus 1700 can specifically include: a processing module 1701, an acquisition module 1702. The sound generating device design apparatus 1700 is used to execute the sound generating device design method described in the method embodiment of FIG. 11.

[0253] Among them, the processing module 1701 is used for the sound generating device design apparatus 1700 to execute the processing functions of any one of FIG. 11. In the embodiments of the present application, the processing module 1701 is used to determine the cabinet size of each loudspeaker in the sound generating device according to the vehicle data; the processing module 1701 is also used to determine the target area, the non-target area, the target demand and the input signal; the processing module 1701 is also used to determine the electroacoustic transfer function of each loudspeaker to each measuring point of the target area and the electroacoustic transfer function of each loudspeaker to each measuring point of the non-target area; the processing module 1701 is also used to determine the circuit parameters in the preset circuit according to the electroacoustic transfer function of each loudspeaker to each measuring point of the target area and the electroacoustic transfer function of each loudspeaker to each measuring point of the non-target area; the processing module 1701 is also used to construct the sound generating device according to the circuit parameters.

[0254] Among them, the acquisition module 1702 is used to support the sound generating device design apparatus 1700 to execute the acquisition functions of any one of FIG. 11. In the embodiments of the present application, the acquisition module 1702 is used to acquire vehicle data.

[0255] Optionally, the sound production device design apparatus 1700 can further include a display module (not shown in FIG. 17) configured to display the constructed sound production device. The sound production device design apparatus 1700 can further include a storage module (not shown in FIG. 17) configured to store programs or instructions. When the programs or instructions are executed by the processing module 1701 and the obtaining module 1702, the sound production device design apparatus 1700 shown in FIG. 17 can perform the sound production device design method described in the above method embodiments. Of course, the sound production device design apparatus 1700 can further include other modules, or the sound production device design apparatus 1700 can include fewer modules. The embodiments of the present application do not make any limitations in this regard.

[0256] The operations and / or functions of each unit in the sound production device design apparatus 1700 are respectively configured to implement the corresponding procedures of the sound production device design method described in the above method embodiments. All relevant contents of each step described in the above method embodiments can be referred to the function description of the corresponding functional unit. The technical effects of the sound production device design apparatus can be referred to the technical effects of the method described in the above method embodiments. For the sake of brevity, no further description is given here.

[0257] The embodiments of the present application further provide a chip system. As shown in FIG. 18, the chip system 1800 includes at least one processor 1801 and at least one interface circuit 1802. For example, when the chip system 1800 includes one processor and one interface circuit, the processor can be the processor 1801 shown in the solid line box in FIG. 18 (or the processor 1801 shown in the dashed line box), and the interface circuit can be the interface circuit 1802 shown in the solid line box in FIG. 18 (or the interface circuit 1802 shown in the dashed line box). When the chip system 1800 includes two processors and two interface circuits, the two processors include the processor 1801 shown in the solid line box and the processor 1801 shown in the dashed line box in FIG. 18, and the two interface circuits include the interface circuit 1802 shown in the solid line box and the interface circuit 1802 shown in the dashed line box in FIG. 18. No limitations are made in this regard.

[0258] The processor 1801 and the interface circuit 1802 can be interconnected by wires. For example, the interface circuit 1802 can be configured to receive signals. For another example, the interface circuit 1802 can be configured to send signals to other devices (e.g., the processor 1801). For example, the interface circuit 1802 can read instructions stored in a memory and send the instructions to the processor 1801. When the instructions are executed by the processor 1801, each step in the above embodiments can be performed. Of course, the chip system can further include other discrete devices, and the embodiments of the present application do not make any specific limitations in this regard.

[0259] Optionally, the processor in the chip system can be one or more. The processor can be implemented by hardware or software. When implemented by hardware, the processor can be a logic circuit, an integrated circuit, etc. When implemented by software, the processor can be a general-purpose processor which is implemented by reading software codes stored in a memory.

[0260] Optionally, the chip system can further include a memory (not shown in FIG. 18), which can also be one or more. The memory can be integrated with the processor or arranged separately from the processor, which is not limited in the present application. For example, the memory can be a non-transient processor such as a read only memory (ROM), which can be integrated on the same chip as the processor or arranged on different chips respectively, and the type of the memory and the arrangement manner of the memory and the processor are not limited in the present application.

[0261] For example, the chip system can be a field programmable gate array (FPGA), an application-specific integrated circuit (ASIC), a system on a chip (SoC), a central processing unit (CPU), a network processor (NP), a digital signal processor (DSP), a microcontroller unit (MCU), a programmable logic device (PLD) or other integrated chips.

[0262] It should be understood that each step in the above method embodiments can be completed by integrated logic circuits of hardware in the processor or instructions in the form of software. The method steps disclosed in combination with the embodiments of the present application can be directly embodied as hardware processor execution or executed by a combination of hardware and software modules in the processor.

[0263] The embodiments of the present application further provide a computer readable storage medium storing one or more computer programs, the one or more computer programs including instructions which, when executed by a computer, cause the computer to perform the corresponding processes of the methods described in the above embodiments.

[0264] The computer readable storage medium includes, but is not limited to, any one of the following: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and various media capable of storing program codes.

[0265] In some embodiments, the disclosed method can be implemented as computer program instructions encoded in a machine-readable format on a computer readable storage medium or on other non-transitory media or articles of manufacture.

[0266] The embodiments of the present application further provide a computer program product, which comprises computer programs or instructions, and when the computer programs or instructions are run on a computer, the computer is caused to execute the corresponding procedures of the method described in the above embodiments.

[0267] In addition, the embodiments of the present application further provide an apparatus, which can be specifically a chip, a component or a module. The apparatus can comprise a processor and a memory connected to each other. The memory is used to store computer-executed instructions. When the apparatus is running, the processor can execute the computer-executed instructions stored in the memory, so that the apparatus executes the corresponding procedures of the method described in the above embodiments.

[0268] In addition, the embodiments of the present application further provide a system, which can be specifically a chip, a component or a module. The system can comprise a processor and a memory connected to each other. The memory is used to store computer-executed instructions. When the system is running, the processor can execute the computer-executed instructions stored in the memory, so that the system executes the corresponding procedures of the method described in the above embodiments.

[0269] The apparatus, the computer readable storage medium, the computer program product or the chip provided by the embodiments of the present application are all used to execute the corresponding method provided above. Therefore, the beneficial effects that can be achieved by them can refer to the beneficial effects in the corresponding method provided above, which will not be repeated here.

[0270] The above describes only specific embodiments of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can easily think of changes or replacements within the technical range disclosed in the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A sound-generating device, characterized in that, include: Processing circuitry, first speaker, and second speaker; The processing circuit includes a first sub-circuit and a second sub-circuit; the first sub-circuit is configured to receive an input signal and output a first signal to the first speaker; the second sub-circuit is configured to receive the input signal and output a second signal to the second speaker. The first signal and the second signal have different phases.

2. The apparatus according to claim 1, characterized in that, The first sub-circuit is configured to output the input signal as the first signal to the first speaker; The second sub-circuit includes an amplifier circuit and a phase adjustment circuit, wherein the phase adjustment circuit is connected between the amplifier circuit and the second speaker; The amplifier circuit is configured to amplify the amplitude of the input signal and output the amplified signal as a first amplified signal to the phase adjustment circuit. The phase adjustment circuit is configured to adjust the phase of the first amplified signal and output the adjusted signal as the second signal to the second speaker.

3. The apparatus according to claim 2, characterized in that, The amplifier circuit includes a first resistor, a second resistor, and a first amplifier; a first terminal of the first resistor is configured to receive the input signal, and a second terminal of the first resistor is connected to the inverting input terminal of the first amplifier; a first terminal of the second resistor is connected to the output terminal of the first amplifier, and a second terminal of the second resistor is connected to the inverting input terminal of the first amplifier; the non-inverting input terminal of the first amplifier is grounded. The phase adjustment circuit includes a third resistor, a fourth resistor, a fifth resistor, a capacitor, and a second amplifier. The first end of the third resistor is connected to the output terminal of the first amplifier, and the second end of the third resistor is connected to the inverting input terminal of the second amplifier. The first end of the fourth resistor is connected to the output terminal of the first amplifier, and the second end of the fourth resistor is connected to the non-inverting input terminal of the second amplifier. The first end of the fifth resistor is connected to the output terminal of the second amplifier, and the second end of the fifth resistor is connected to the inverting input terminal of the second amplifier. The first end of the capacitor is connected to the second end of the fourth resistor, and the second end of the capacitor is grounded.

4. The apparatus according to claim 1, characterized in that, The first sub-circuit includes an amplifier circuit configured to amplify the amplitude of the input signal and output the amplified signal as the first information to the first speaker. The second sub-circuit includes a phase adjustment circuit configured to adjust the phase of the input signal and output the adjusted signal as the second signal to the second speaker.

5. The apparatus according to claim 4, characterized in that, The amplifier circuit includes a first resistor, a second resistor, and a first amplifier; a first terminal of the second resistor is configured to receive the input signal, and a second terminal of the second resistor is connected to the inverting input terminal of the first amplifier; a first terminal of the first resistor is connected to the output terminal of the first amplifier, and a second terminal of the first resistor is connected to the inverting input terminal of the first amplifier; the non-inverting input terminal of the first amplifier is grounded. The phase adjustment circuit includes a third resistor, a fourth resistor, a fifth resistor, a capacitor, and a second amplifier. The first terminal of the third resistor is configured to receive the input signal, and the second terminal of the third resistor is connected to the inverting input terminal of the second amplifier. The first terminal of the fourth resistor is configured to receive the input signal, and the second terminal of the fourth resistor is connected to the non-inverting input terminal of the second amplifier. The first terminal of the fifth resistor is connected to the output terminal of the second amplifier, and the second terminal of the fifth resistor is connected to the inverting input terminal of the second amplifier. The first terminal of the capacitor is connected to the second terminal of the fourth resistor, and the second terminal of the capacitor is grounded.

6. The apparatus according to claim 4, characterized in that, The amplification circuit includes a first resistor, a second resistor, and a first amplifier; the non-inverting input terminal of the first amplifier is configured to receive the input signal, and the output terminal of the first amplifier is connected to the first terminal of the first resistor; the second terminal of the first resistor is connected to the first terminal of the second resistor, and the second terminal of the first resistor is also connected to the inverting input terminal of the first amplifier; the second terminal of the second resistor is grounded. The phase adjustment circuit includes a third resistor, a fourth resistor, a fifth resistor, a capacitor, and a second amplifier. The first terminal of the third resistor is configured to receive the input signal, and the second terminal of the third resistor is connected to the inverting input terminal of the second amplifier. The first terminal of the capacitor is configured to receive the input signal, and the second terminal of the capacitor is connected to the non-inverting input terminal of the second amplifier. The first terminal of the fourth resistor is connected to the second terminal of the capacitor, and the second terminal of the fourth resistor is grounded. The first terminal of the fifth resistor is connected to the output terminal of the second amplifier, and the second terminal of the fifth resistor is connected to the inverting input terminal of the second amplifier.

7. The apparatus according to any one of claims 1 to 6, characterized in that, The sound outlet of the first speaker faces a different direction than the sound outlet of the second speaker.

8. The apparatus according to any one of claims 1 to 6, characterized in that, The sound outlet of the first speaker faces the same direction as the sound outlet of the second speaker, and the sound outlets of the first speaker and the second speaker are not located on the same plane.

9. The apparatus according to any one of claims 1 to 8, characterized in that, The sound-generating device further includes a first enclosure and a second enclosure, wherein the first speaker is disposed in the first enclosure and the second speaker is disposed in the second enclosure.

10. The apparatus according to any one of claims 1 to 8, characterized in that, The sound-generating device further includes a third enclosure, which includes a partition; the first speaker and the second speaker are disposed in the third enclosure, and the first speaker and the second speaker are located on both sides of the partition.

11. The apparatus according to any one of claims 1 to 10, characterized in that, The sound-generating device also includes a third loudspeaker; The processing circuit further includes a third sub-circuit, which is configured to receive the input signal and output a third signal to the third speaker. The first signal, the second signal, and the third signal have different phases.

12. A headrest system, characterized in that, include: The headrest and the sound-generating device according to any one of claims 1 to 11, wherein the sound-generating device is disposed near the headrest.

13. A seat, characterized in that, The seat includes the sound-generating device according to any one of claims 1 to 11.

14. A means of transportation, characterized in that, It includes at least one of the sound-generating device according to any one of claims 1 to 11, the headrest system according to claim 12, or the seat according to claim 13.

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