Sound production device, headrest system, seat and vehicle

Abstract

The invention provides a sound production device, a headrest system, a seat and a vehicle, and is applied to the technical field of electronics. The sound production 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 a second loudspeaker; wherein the first signal and the second signal are different in phase. The processing circuit is used for adjusting the signals provided for the first loudspeaker and the second loudspeaker in the sound production device so as to change the radiation sound field of the first loudspeaker and the second loudspeaker, and sound is accurately controlled. And the structure is simple, the cost is low, and the influence on other areas can be reduced when the sound effect experience of the target area is changed.

Description

Technical Field

[0001] This application relates to the field of electronic technology, and more particularly to a sound-generating device, a headrest system, a seat, and a vehicle. Background Technology

[0002] With the rapid development and application of smart cockpits, they can provide customers with a superior user experience. To enhance the audio experience for users in different areas (such as the driver's area, passenger area, or rear seats), localized active noise cancellation can be used to cancel out noise in different areas. Alternatively, zoned sound field reproduction can generate different sound field effects in different areas, allowing passengers in different areas to achieve a personalized audio experience. However, when localized active noise cancellation and zoned sound field reproduction change the noise or sound field in one area, they can also affect other areas. For example, the reverse sound waves generated by localized active noise cancellation in the driver's area can propagate to the rear seats, affecting the noise cancellation effect in the rear seats.

[0003] Therefore, how to reduce the impact on other areas when changing the sound experience of the target area has become an urgent technical problem to be solved. Summary of the Invention

[0004] This application provides a sound-generating device, headrest system, seat, and vehicle that can reduce the impact on other areas when changing the sound experience in a target area.

[0005] To achieve the above objectives, this application provides the following technical solution:

[0006] In a first aspect, this application provides a sound-generating device, which includes: a processing circuit, a first loudspeaker, and a second loudspeaker; 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 loudspeaker; the second sub-circuit is configured to receive an input signal and output a second signal to the second loudspeaker; wherein the first signal and the second signal are in different phases.

[0007] In this application, the processing circuit in the sound-generating device adjusts the signals provided to the first and second speakers to change the radiated sound fields of the first and second speakers, thereby achieving precise sound control. Furthermore, it has a simple structure, low cost, and can reduce the impact on other areas when changing the sound experience in the target area.

[0008] According to the first aspect, the amplitudes of the first signal and the second signal are different.

[0009] The first and second sub-circuits are pre-installed analog circuits in the sound-generating device, used to process sound signals.

[0010] The input signal is the signal received by the sound-generating device and used to control the sound-generating device to produce sound. The input signal can be a digital signal or an analog signal, used to instruct the sound-generating device to produce sound.

[0011] The first and second loudspeakers can be sealed loudspeakers. The loudspeaker units used in the first and second loudspeakers can be moving-coil loudspeakers.

[0012] In this application, the first and second sub-circuits in the processing circuit receive input signals and output signals with different amplitudes and phases, causing the first and second loudspeakers to produce different sound fields. When the sound fields of the first and second loudspeakers are superimposed, the desired sound field effect can be formed in the area where the sound-emitting device is located. In other areas, the sound intensity will be reduced or eliminated due to the interference and superposition effect of sound waves, thereby reducing the impact of the sound-emitting device on other areas.

[0013] According to the first aspect, or any implementation of the first aspect above, 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 amplifier circuit and a phase adjustment circuit, the phase adjustment circuit being 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 a second signal to the second speaker.

[0014] In some examples, the amplifier circuit is an inverting amplifier circuit, implemented by an inverting amplifier, and the phase adjustment circuit is implemented by an all-pass phase shifter.

[0015] According to the first aspect, or any implementation of the first aspect above, 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 an 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; a first terminal of the third resistor is connected to the output terminal of the first amplifier, and a second terminal of the third resistor is connected to the inverting input terminal of the second amplifier; a first terminal of the fourth resistor is connected to the output terminal of the first amplifier, and a second terminal of the fourth resistor is connected to the non-inverting input terminal of the second amplifier; a first terminal of the fifth resistor is connected to the output terminal of the second amplifier, and a second terminal of the fifth resistor is connected to the inverting input terminal of the second amplifier; a first terminal of the capacitor is connected to the second terminal of the fourth resistor, and a second terminal of the capacitor is grounded.

[0016] In this application, the first sub-circuit of the aforementioned processing circuit does not process the input signal, while the second sub-circuit performs amplitude amplification and phase processing on the input signal. Thus, the amplitude and phase of the signals received by the first and second speakers are different. The first and second speakers precisely control the sound field based on the received signals, thereby reducing the impact on other areas when changing the sound experience in the target area.

[0017] According to the first aspect, or any implementation of the first aspect above, the first sub-circuit includes an amplification circuit configured to amplify the amplitude of the input signal and output the amplified signal as 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 a second signal to the second speaker.

[0018] In some examples, the amplifier circuit includes both an inverting amplifier circuit and a non-inverting amplifier circuit.

[0019] According to the first aspect, or any implementation of the first aspect above, the amplifier circuit includes a first resistor, a second resistor, and a first amplifier; the first terminal of the second resistor is configured to receive an input signal, and the second terminal of the second resistor is connected to the inverting input terminal of the first amplifier; the first terminal of the first resistor is connected to the output terminal of the first amplifier, and the 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 an 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 an 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.

[0020] In some examples, the amplifier circuit is implemented using an inverting amplifier, and the phase adjustment circuit is implemented using an all-pass phase shifter.

[0021] According to the first aspect, or any implementation of the first aspect above, the amplifier 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 an 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 an 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 an 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.

[0022] In some examples, the amplifier circuit is implemented using a non-inverting amplifier, and the phase adjustment circuit is implemented using a full-pass phase shifter.

[0023] In this application, the first sub-circuit of the aforementioned processing circuit amplifies the input signal, and the second sub-circuit amplifies and processes the phase of the input signal. Thus, the amplitude and phase of the signals received by the first and second speakers are different. The first and second speakers precisely control the sound field based on the received signals, thereby reducing the impact on other areas when changing the sound experience in the target area.

[0024] In some examples, the ratio of the first resistor to the second resistor ranges from 1 to 10.

[0025] In some examples, the third, fourth, and fifth resistors have the same resistance value, and the product of the third resistor's resistance and the capacitor's capacitance is in the range of 1 × 10⁻⁶. –5 seconds - 1 × 10 –3 Second.

[0026] In some examples, the sound-generating device may also include a first power amplifier and a second power amplifier. One end of the first power amplifier is connected to a first sub-circuit, and the other end is connected to a first loudspeaker. One end of the second power amplifier is connected to a second sub-circuit, and the other end is connected to a second loudspeaker.

[0027] According to the first aspect, or any implementation of the first aspect above, the sound outlet orientation of the first speaker is different from that of the second speaker.

[0028] In some examples, the first speaker and the second speaker are positioned back to back, with the sound outlet of the first speaker facing the front of the vehicle and the sound outlet of the second speaker facing the rear of the vehicle.

[0029] According to the first aspect, or any implementation of the first aspect above, 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.

[0030] In some examples, the sound outlets of the first speaker and the second speaker both face forward of the vehicle, but the sound outlets of the first speaker and the second speaker are not located on the same plane in the vertical direction, and the first speaker and the second speaker are staggered.

[0031] According to the first aspect, or any implementation of the first aspect above, the sound-generating device further includes a first enclosure and a second enclosure, with the first loudspeaker disposed in the first enclosure and the second loudspeaker disposed in the second enclosure.

[0032] In some examples, each speaker in the sound-generating device is installed independently, with one speaker per enclosure.

[0033] In this application, each speaker is independently housed within the enclosure, allowing for better control of the sound field and sound directionality. Independent installation of each speaker also reduces sound interference between different speakers, and the simple structure facilitates subsequent maintenance.

[0034] According to the first aspect, or any implementation of the first aspect above, the sound-generating device further includes a third enclosure, the third enclosure including a partition; the first loudspeaker and the second loudspeaker are disposed in the third enclosure, the first loudspeaker and the second loudspeaker are located on both sides of the partition.

[0035] In some examples, multiple speakers in the sound-generating device are integrated into the same enclosure, with each speaker separated by partitions within the enclosure.

[0036] In this application, multiple speakers are integrated into the same enclosure and separated by partitions, which reduces the number of enclosures, saves space and materials, and optimizes space utilization and material costs. The partitions effectively isolate the sound produced by different speakers, preventing mutual interference.

[0037] According to the first aspect, or any implementation of the first aspect above, the sound-generating device further includes a third loudspeaker; the processing circuit further includes a third sub-circuit configured to receive an input signal and output a third signal to the third loudspeaker; wherein the first signal, the second signal, and the third signal are in different phases.

[0038] Secondly, this application provides a headrest system comprising: a headrest and a sound-emitting device as described in the first aspect, the sound-emitting device being disposed near the headrest.

[0039] In some examples, the headrest includes a cushion with one or more mounting holes for mounting a sound-generating device.

[0040] Thirdly, this application provides a seat that includes a sound-generating device as described in the first aspect.

[0041] Fourthly, this application provides a means of transportation that includes a sound-generating device as described in the first aspect, a headrest system as described in the second aspect, or a seat as described in the third aspect.

[0042] Fifthly, this application provides a method for designing a sound-generating device, which is used to design the sound-generating device as described in the first aspect. The method includes: acquiring vehicle data; determining the enclosure size of each loudspeaker in the sound-generating device based on the vehicle data; determining a target area, a non-target area, a target requirement, and an input signal; determining the electroacoustic transfer function from each loudspeaker to each measurement point in the target area and the electroacoustic transfer function from each loudspeaker to each measurement point in the non-target area; determining circuit parameters in a preset circuit based on the electroacoustic transfer functions from each loudspeaker to each measurement point in the target area and the electroacoustic transfer function from each loudspeaker to each measurement point in the non-target area; and constructing the sound-generating device based on the circuit parameters.

[0043] In a sixth aspect, this application provides a chip system including at least one processor and at least one interface circuit, the at least one interface circuit being used to perform transceiver functions, and the at least one processor being used to perform the method as described in the fifth aspect.

[0044] In a seventh aspect, this application provides a computer-readable storage medium for storing one or more computer programs, the one or more computer programs including instructions that, when executed by a computer, cause the computer to perform the methods described in the fifth aspect.

[0045] Eighthly, this application provides a computer program product comprising: a computer program or instructions that, when executed on a computer, cause the computer to perform the method described in the fifth aspect.

[0046] The technical effects corresponding to any implementation method of aspects two through eight, and each aspect, can be found in the first aspect and the technical effects corresponding to any implementation method of the first aspect mentioned above, and will not be repeated here. Attached Figure Description

[0047] Figure 1This is a schematic diagram of the vehicle structure provided in an embodiment of this application;

[0048] Figure 2 This is a structural schematic diagram of the seat provided in an embodiment of this application;

[0049] Figure 3 This is a schematic diagram of the headrest system provided in an embodiment of this application;

[0050] Figure 4 Schematic diagram of the structure of the sound-generating device provided in the embodiments of this application Figure 1 ;

[0051] Figure 5A A schematic diagram of the loudspeaker in the sound-generating device provided in the embodiments of this application. Figure 1 ;

[0052] Figure 5B A schematic diagram of the loudspeaker in the sound-generating device provided in the embodiments of this application. Figure 2 ;

[0053] Figure 6 Schematic diagram of the structure of the sound-generating device provided in the embodiments of this application Figure 2 ;

[0054] Figure 7 Schematic diagram of the structure of the sound-generating device provided in the embodiments of this application Figure 3 ;

[0055] Figure 8 Schematic diagram of the structure of the sound-generating device provided in the embodiments of this application Figure 4 ;

[0056] Figure 9 Schematic diagram five of the structure of the sound-generating device provided in the embodiments of this application;

[0057] Figure 10 Schematic diagram of the structure of the sound-generating device provided in the embodiments of this application Figure 6 ;

[0058] Figure 11 A schematic flowchart illustrating the design method of the sound-generating device provided in the embodiments of this application;

[0059] Figure 12 This is a schematic diagram of the housing structure in the sound-generating device provided in the embodiments of this application;

[0060] Figure 13 A top view of the vehicle provided in an embodiment of this application;

[0061] Figure 14 A schematic diagram illustrating the relationship between circuit parameters provided in this application and the average sound pressure difference between the target area and the non-target area;

[0062] Figure 15 This is a schematic diagram of the circuit parameter values ​​provided in the embodiments of this application;

[0063] Figure 16 The sound pressure level distribution diagram provided in the embodiments of this application;

[0064] Figure 17 This is a schematic diagram of the structure of the sound-generating device design provided in the embodiments of this application;

[0065] Figure 18 This is a schematic diagram of the chip system provided in an embodiment of this application. Detailed Implementation

[0066] In the description of the embodiments of this application, unless otherwise stated, " / " means "or". For example, A / B can mean A or B. "And / or" in this document is merely a description of the relationship between related objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist simultaneously, and B exists alone.

[0067] Hereinafter, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

[0068] In the description of the embodiments of this application, unless otherwise stated, "a plurality of" means two or more. In the embodiments of this application, words such as "exemplary" or "for example" are used to indicate examples, illustrations, or explanations. Any embodiment or design that is described as "exemplary" or "for example" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or design options. Specifically, the use of words such as "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.

[0069] See Figure 1 This is a structural schematic diagram of a vehicle 100, which may include various subsystems, such as wheels 110, power system, computer system and vehicle body 120.

[0070] It is understood that vehicle 100 may include more or fewer subsystems, and each subsystem may include multiple components. Furthermore, each subsystem and component of vehicle 100 may be interconnected via wired or wireless means.

[0071] The power system and wheels 110 are mounted on the vehicle body 120, and the power system is connected to the wheels 110 in a transmission manner to drive the wheels 110 to rotate, thereby providing power for the movement of the vehicle 100. The number of wheels 110 can include 4, 6, 8, etc., and this embodiment will be described using 4 wheels 110 as an example. However, it is understood that this embodiment does not limit the number of wheels 110. Accordingly, two of the four wheels 110 (two front wheels) are located at the front of the vehicle body 120 along the longitudinal direction (the driving direction of the vehicle 100), and the remaining two wheels 110 (two rear wheels 110) are located at the rear of the vehicle body 120 along the longitudinal direction.

[0072] The power system can be connected to the two front wheels 110 (front-wheel drive); or, the power system can be connected to the two rear wheels 110 (rear-wheel drive); or, the power system can be connected to all four wheels 110 (four-wheel drive). This application embodiment does not limit this. In this application embodiment, the vehicle 100 can be a gasoline vehicle. Accordingly, the power system includes an internal combustion engine and a transmission connected to the internal combustion engine. The transmission is connected to the wheels 110, and the internal combustion engine drives the wheels 110 to rotate through the transmission, thereby driving the vehicle 100. Of course, the vehicle 100 in the application embodiment can also be an electric vehicle. Accordingly, the power system includes an electric motor and a power battery electrically connected to the electric motor. The electric motor is connected to the wheels 110. When driving, the power battery drives the electric motor to work, thereby driving the wheels 110 to rotate to provide driving force.

[0073] Some or all of the functions of vehicle 100 are controlled by a computer system. The computer system may include at least one processor and memory, the processor executing instructions stored in a non-transitory computer-readable medium such as memory. The computer system may also be multiple computing devices that control individual components or subsystems of vehicle 100 in a distributed manner.

[0074] 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.

[0075] The computer system can control the functions of vehicle 100 based on inputs received from various vehicle subsystems (e.g., powertrain system, etc.).

[0076] In some embodiments, vehicle 100 may further include a vehicle controller (not included in...) Figure 1As shown in the diagram, the vehicle controller can also be described as a powertrain controller or an intelligent driving computing platform, and is the core control component of the entire vehicle. It collects input information from various systems and components, makes corresponding judgments based on the input information, and controls the actions of various components in the vehicle 100 to drive the vehicle 100.

[0077] The vehicle body 120 is enclosed to form a vehicle cabin, which is divided into a driver's cab 121 and a passenger cabin 122 based on location. When riding in the vehicle, the user is located in either the driver's cab 121 or the passenger cabin 122. It is understandable that the passenger cabin 122 can be further divided into a front passenger area and a rear passenger area. Figure 1 Not shown in the image.

[0078] It is understood that the components described above can be coupled together in a wired and / or wireless manner. The components described above are merely an example; in practical applications, components in each of the above modules may be added or removed as needed. Figure 1 This should not be construed as a limitation on the vehicles described in the embodiments of this application.

[0079] The aforementioned vehicle 100 can be a new energy vehicle, electric vehicle, sedan, truck, motorcycle, bus, recreational vehicle, amusement park vehicle, golf cart, etc. The power of the aforementioned vehicle 100 can be provided by gasoline, diesel, electricity, solar energy, hydrogen energy, etc. The vehicle 100 can also be a ship, airplane, helicopter, lawnmower, construction equipment, tram, train, or other mobile means of transportation; this application does not impose any particular limitation.

[0080] To facilitate user travel, vehicle 100 also includes, for example Figure 2 The seat 130 shown is located within the driver's cab 121 and passenger cabin 122. The seat 130 includes a seat cushion 131 and a backrest 132. The seat cushion 131 is connected to the vehicle body 120, and the backrest 132 is located at one end (rear end) of the seat cushion 131. A user can sit on the seat cushion 131 and lean their torso against the backrest 132. The vehicle 100 also includes a headrest system 140, which is located on the backrest 132. During passenger seating, the headrest system 140 provides support and protection for the user's head, improving passenger comfort.

[0081] In some implementations, the headrest system 140 may be detachably connected to the top of the backrest 132. In other implementations, the headrest system 140 may be an integral part of the backrest 132, and this application embodiment does not impose any limitations on this.

[0082] To provide users with a better audio experience, the headrest system 140 includes a headrest and a sound-emitting device, which is positioned close to the headrest. The number of sound-emitting devices can be one or more. The sound-emitting devices can be located within the headrest, or they can be located near the headrest. This application embodiment does not impose any limitations on this. For example, the sound-emitting devices can be located on both sides of the headrest.

[0083] Taking the sound-generating device located on both sides of the headrest as an example, see... Figure 3 This is a structural schematic diagram of the headrest system 140. Figure 3 Figure (a) shows a schematic diagram of the headrest system 140, which includes an outer cover 141, a headrest 142, and a sound-generating device 143. The outer cover 141 covers the headrest 142 and comes into contact with the user's head. The material of the outer cover 141 can be leather, fabric, etc. The headrest 142 includes a buffer body to provide support for the user's head. The material of the buffer body can be sponge, rubber, or other materials with a certain degree of elasticity. The sound-generating device 143 can be disposed within the buffer body of the headrest 142. For example, the buffer body has mounting holes, and the sound-generating device 143 is disposed within the mounting holes.

[0084] like Figure 3 Image (b) shows a front view of the headrest system 140. The outer cover 141 may also include multiple through holes 144. The through holes 144 may be disposed on the outer cover 141 in areas corresponding to the sound-emitting device 143. When the sound-emitting device 143 emits sound, the sound can be transmitted to the user through the through holes 144. The embodiments of this application do not limit the number and shape of the through holes 144.

[0085] Understandably, the sound-emitting device 143 can create a sound field around the headrest system 140 to play audio to the user. For example, the sound-emitting device 143 can play music, play external warning sounds (such as the horns of other vehicles), perform active noise cancellation (play noise-canceling sounds), and provide private sounds (such as call sounds) to improve the user experience.

[0086] Of course, in some implementations, vehicle 100 may also include other sound-emitting devices. For example, a sound-emitting device may be installed on the inside of the door to play audio to the driver's cab 121 and / or passenger cabin 122. Alternatively, a sound-emitting device may be installed on the central control platform of vehicle 100.

[0087] Understandably, the sound-emitting device 143 in the headrest system 140 is closer to the user's ears than other sound-emitting devices in the vehicle 100, which has a greater impact on the user's hearing and affects the user's sound experience.

[0088] In practical use, when the headrest system 140 emits sound, it alters the sound field in the area where the headrest system 140 is located, and also affects the sound field in other areas. For example, if the driver in the driver's seat is playing music through the headrest system on the driver's seat, while the rear passengers are sleeping, the driver can hear the music. However, due to the propagation of sound, the sound from the driver's seat will travel to the rear passengers, with the sound intensity gradually decreasing with distance. The rear passengers will also hear some noise, affecting their rest.

[0089] Understandably, the above examples illustrate different areas of a vehicle, an enclosed space. In real-world applications, this problem also exists in everyday life and work scenarios. For instance, in a home, when someone listens to music or watches TV through a home theater, the sound can travel to other rooms, disturbing other family members' work or rest.

[0090] Therefore, how to reduce the impact on other areas when changing the sound effect experience in the target area and accurately control the sound has become an urgent technical problem to be solved.

[0091] In some examples, near-field loudspeakers are designed in free space using the acoustic radiation mode method and spectral decomposition method to achieve a higher sound pressure level in the near field and a rapid attenuation of the sound pressure level in the far field. However, near-field loudspeakers designed using the above methods require a large number of loudspeaker units, resulting in high costs; furthermore, these near-field loudspeakers are designed based on the characteristics of free-space sound fields and are not suitable for irregularly shaped vehicle cabins.

[0092] In other examples, in free space, precise control of the sound field is achieved through combined sources, but combined sources also require a large number of speaker units, which is costly; and combined sources are mostly used in free or semi-free spaces, not in vehicle cabins.

[0093] Understandably, while the sound control method applied to free space in the above example can precisely control sound, it requires a large number of speakers, resulting in high costs.

[0094] In other examples, directional sound projection and control are achieved in the vehicle cabin using end-firing directional arrays. Specifically, sound-emitting devices, employing end-firing directional arrays, are installed on both sides of the headrest. Because end-firing directional arrays exhibit directional distribution in a direction perpendicular to the speaker array, when designing end-firing directional arrays on the seat, the end-firing directional arrays on both sides of the headrest must be positioned perpendicular to the headrest. The end-firing directional arrays on both sides of the headrest form a semi-enclosed structure, covering the back and sides of the user's head. However, this semi-enclosed headrest structure is detrimental to driving, restricting head movement; it also obstructs the user's field of vision, increasing blind spots and hindering the user's observation of traffic conditions; it increases driving risks and safety hazards, affecting driving comfort and safety.

[0095] In other examples, directional sound projection and control are achieved in the vehicle cabin using phase-shifting sources. Specifically, a sound-generating device, employing a supercardioid phase-shifting source, is installed in the headrest of each seat in the vehicle cabin. The supercardioid phase-shifting source can change the phase of sound waves, focusing sound energy on a specific area and attenuating sound from other directions. However, phase-shifting sources need to be installed on each seat, resulting in a complex structure and high cost.

[0096] To address the aforementioned technical problems, this application provides a sound-generating device, which includes a processing circuit, a first speaker, and a second speaker. The processing circuit adjusts the signals provided to the first and second speakers to alter their radiated sound fields, thereby precisely controlling the sound. Furthermore, the device is simple in structure, low in cost, and can minimize the impact on other areas when altering the sound experience in a target area.

[0097] The technical solutions of the embodiments of this application will be described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0098] The following describes the sound-generating device provided in the embodiments of this application, using a vehicle as an example. It is understood that the sound-generating device in the embodiments of this application can also be applied to other scenarios (such as home, work, entertainment, etc.).

[0099] See Figure 4 This is a schematic diagram of the structure of a sound-generating device 400 provided in an embodiment of this application. The sound-generating device 400 includes a processing circuit, a first loudspeaker, and a second loudspeaker.

[0100] In this embodiment, 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 a first speaker; the second sub-circuit is configured to receive an input signal and output a second signal to a second speaker. The first signal and the second signal are in different phases.

[0101] Optionally, the amplitudes of the first signal and the second signal can be the same or different. In practical applications, the amplitudes of the first signal and the second signal are mostly different.

[0102] Optionally, the first and second sub-circuits are preset analog circuits in the sound-generating device used to process sound signals.

[0103] It is understood that the various modules in the sound-generating device can be installed in combination (e.g., integrated into the same device) or independently. Taking the sound-generating device installed in a vehicle as an example, the processing circuit, the first speaker, and the second speaker in the sound-generating device are integrated into the headrest. Alternatively, the processing circuit in the sound-generating device is installed in the seat back, and the first speaker and the second speaker are installed in the headrest. The embodiments of this application do not limit the installation method of the sound-generating device.

[0104] Optionally, the sound-generating device 400 may include more or fewer components, and each component may include multiple elements. The components and elements in the sound-generating device 400 are communicatively connected.

[0105] The input signal is the signal received by the sound-generating device and used to control the sound-generating device to produce sound. The input signal can be a digital signal or an analog signal, used to instruct the sound-generating device to produce sound.

[0106] Optionally, the input signal may include frequency information, amplitude information, time domain information, spectrum information, and phase information.

[0107] Using vehicles as an application scenario, in some examples, the vehicle controller generates an input signal in response to user operation and transmits the input signal to the sound-generating device. For example, when the 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, which then plays the music based on the audio signal.

[0108] In other examples, the vehicle controller generates an input signal in response to signals detected by sensors and transmits the input signal to a sound-generating device. For instance, a microphone sensor in the vehicle cabin detects noise in the cabin and sends the detection data to the vehicle controller. The vehicle controller generates an input signal based on the detection data and transmits the input signal to the sound-generating device. The sound-generating device emits an anti-phase sound wave based on the input signal to cancel out the noise in the vehicle cabin.

[0109] The first signal is the signal output by the first sub-circuit after the input signal is transmitted through the first sub-circuit.

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

[0111] In this embodiment, the first speaker and the second speaker can be enclosed speakers, and the enclosed enclosures used for the first speaker and the second speaker are of the same size.

[0112] Understandably, because the enclosure is sealed, the speaker unit's vibration is constrained, reducing audio distortion. Sealed speakers effectively control the speaker unit's vibration, minimizing resonance and reflections, thus maintaining the phase characteristics of the sound waves and improving clarity. Their compact design allows for flexible installation and placement, making them suitable for small spaces. When producing sound, sealed speakers reproduce the signal received by the speaker, providing a more natural and balanced tone.

[0113] In some embodiments of this application, the sound-generating device further includes a first enclosure and a second enclosure, with a first speaker disposed in the first enclosure and a second speaker disposed in the second enclosure.

[0114] It is understandable that in the above embodiments, each speaker is installed independently, with one speaker per enclosure. Independent placement of each speaker within the enclosure allows for better control of the sound field and sound directionality. Independent installation also reduces sound interference between different speakers and simplifies the structure, facilitating subsequent maintenance.

[0115] In other embodiments of this application, the sound-generating device further includes a third enclosure, the third enclosure including a partition; a first speaker and a second speaker are disposed in the third enclosure, the first speaker and the second speaker being located on both sides of the partition.

[0116] It is understood that in the above embodiments, multiple speakers are integrated into the same enclosure, with each speaker separated by a partition within the enclosure. Integrating multiple speakers into the same enclosure and separating them with partitions can reduce the number of enclosures, save space and materials, and optimize space utilization and material costs. The partitions can effectively isolate the sound produced by different speakers, preventing mutual interference between the sound emitted by different speakers.

[0117] In this embodiment, the speaker units used in the first speaker and the second speaker can be moving-coil speakers. The moving-coil speakers in the first speaker and the second speaker are of the same model.

[0118] In some embodiments of this application, the sound outlet of the first speaker faces a different direction than that of the second speaker. For example, the first speaker and the second speaker are arranged back to back, with the sound outlet of the first speaker facing the front of the vehicle and the sound outlet of the second speaker facing the rear of the vehicle.

[0119] For example, such as Figure 5AThe diagram shows the structure of the first and second loudspeakers in a sound-generating device. The analog circuitry is not shown, and the arrows indicate the direction of the sound outlets. The example assumes the sound-generating device is used in a vehicle, with the first and second loudspeakers being enclosed enclosure loudspeakers of the same size.

[0120] like Figure 5A As shown in (a), this is a top view of the first and second loudspeakers in the sound-generating device. For example, the sound-generating 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, with the sound outlet of the first loudspeaker 501 facing in the opposite direction to the sound outlet of the second loudspeaker 502. For example, the sound outlet of the first loudspeaker 501 faces the front of the vehicle (directly in front of the vehicle), and the sound outlet of the second loudspeaker 502 faces the rear of the vehicle (directly behind the vehicle). The plane containing the sound outlet of the first loudspeaker 501 is parallel to the plane containing the sound outlet of the second loudspeaker 502.

[0121] For example, the sound-generating device includes a first speaker 503 and a second speaker 504, with the sound outlet of the first speaker 503 facing different directions than that of the second speaker 504. For instance, the sound outlet of the first speaker 501 faces the front left of the vehicle, while the sound outlet of the second speaker 502 faces the rear left of the vehicle. The plane containing the sound outlet of the first speaker 503 intersects with the plane containing the sound outlet of the second speaker 504. As another example, the sound-generating device includes a first speaker 505 and a second speaker 506, with the sound outlet of the first speaker 505 facing different directions than that of the second speaker 506. For instance, the sound outlet of the first speaker 501 faces the front of the vehicle (directly in front), while the sound outlet of the second speaker 502 faces the front right of the vehicle. The plane containing the sound outlet of the first speaker 505 intersects with the plane containing the sound outlet of the second speaker 506.

[0122] like Figure 5A As shown in (b) of the diagram, this is a side view of the first speaker 501 and the second speaker 502 in the sound-generating device, with the sound outlet of the first speaker 501 facing the front of the vehicle. For example, the back panel of the first speaker 501 is in complete contact with the back panel of the second speaker 502. Alternatively, the back panel of the first speaker 501 is in partial contact with the back panel of the second speaker 502. Yet another example is that the back panels of the first speaker 501 and the second speaker 502 are not in contact and are located on the same plane.

[0123] It is understandable that the back plates of the first speaker and the second speaker in the sound-generating device are in complete contact, and the first speaker and the second speaker face opposite directions, which is the most space-saving structure.

[0124] In some other embodiments of this application, the sound outlet of the first speaker faces the same direction as the sound outlet of the second speaker, but the sound outlets of the first speaker and the second speaker are not located on the same plane. For example, the sound outlets of the first speaker and the second speaker both face the front of the vehicle, but the sound outlets of the first speaker and the second speaker are not located on the same plane in the vertical direction, and the first speaker and the second speaker are staggered.

[0125] Understandably, staggering the speaker outlets can widen the sound field, reduce sound field shift, and enhance stereo sound, thereby improving the sound effect in the target area.

[0126] For example, such as Figure 5B The diagram shows the structure of the first and second loudspeakers in a sound-generating device. The analog circuitry is not shown, and the arrows indicate the direction of the sound outlets. The example assumes the sound-generating device is used in a vehicle, with the first and second loudspeakers being enclosed enclosure loudspeakers of the same size.

[0127] For example, such as Figure 5B As shown in (a), this is a side view of the first and second loudspeakers in the sound-generating device. For example, the sound-generating device includes a first loudspeaker 507 and a second loudspeaker 508. The sound outlet of the first loudspeaker 507 faces the same direction as the sound outlet of the second loudspeaker 508, both facing the front of the vehicle. The sound outlets of the first loudspeaker 507 and the second loudspeaker 508 are not located on the same plane. As another example, the sound-generating device includes a first loudspeaker 509 and a second loudspeaker 510. The sound outlets of the first loudspeaker 509 and the second loudspeaker 510 face the same direction, both facing the roof of the vehicle. The sound outlets of the first loudspeaker 509 and the second loudspeaker 510 are not located on the same plane.

[0128] Optionally, when the first speaker and the second speaker are facing the front of the vehicle, the sound outlets of the first speaker and the second speaker can be located on the same plane.

[0129] like Figure 5B Image (b) shows a side view of the first speaker 507 and the second speaker 508 in the sound-generating device. The sound outlets of the first speaker 507 and the first speaker 508 are the same, both facing the front of the vehicle. The sound outlets of the first speaker 507 and the second speaker 508 are not located on the same plane. For example, the first speaker 507 is located directly in front of the first speaker 508. Or, the first speaker 507 is located to the lower left of the first speaker 508.

[0130] It is understandable that the above Figure 5A and Figure 5BThe structures of the first and second loudspeakers in the sound-generating device shown are merely examples. In practical applications, the structures of the first and second loudspeakers in the sound-generating device can have different designs, and this application does not impose any limitations on them.

[0131] It is understood that in this application, the first and second sub-circuits in the processing circuit receive input signals and output signals with different amplitudes and phases, causing the first and second loudspeakers to produce different sound fields. When the sound fields of the first and second loudspeakers are superimposed, the desired sound field effect can be formed in the area where the sound-emitting device is located. In other areas, the sound intensity will be reduced or eliminated due to the interference and superposition effect of sound waves, thereby reducing the impact of the sound-emitting device on other areas.

[0132] As is understandable, a sound-generating device produces sound waves through vibration. These sound waves propagate through a medium (such as air), allowing the user to hear the sound. Amplitude refers to the size of the sound wave's amplitude, i.e., the intensity of the sound. This application, by adjusting the amplitude of the signal received by the loudspeaker, can change the intensity of the sound waves emitted by different loudspeakers, thereby affecting the range and intensity of sound propagation in space. Phase refers to the position of the vibration waveform relative to a reference point (usually the starting point of the waveform) within one cycle; phase can represent the vibration state of the sound wave. This application, by adjusting the phase of the signal received by the loudspeaker, can adjust the phase of the sound waves emitted by different loudspeakers, thereby changing the superposition of sound waves in space.

[0133] It should be understood that when two or more sound waves meet, they interfere and superimpose. The superposition of sound waves with different phases and amplitudes produces different superposition effects. This application adjusts the amplitude and phase of the signals received by the first and second speakers through processing circuitry, thereby controlling the interference and superposition effects of sound waves when the first and second speakers emit sound, controlling the distribution of sound in space, and achieving directional emission and precise adjustment of sound. This reduces the impact on other areas when changing the sound experience in a target area, achieving localized adjustment without interfering with the sound experience in other areas.

[0134] As is understood, the basic modules of the sound-generating device provided in this application have been introduced above. The specific circuit structure of the sound-generating device will now be described in detail, assuming the first and second speakers are arranged back-to-back.

[0135] 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 amplifier circuit and a phase adjustment circuit, with the phase adjustment circuit 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 a second signal to the second speaker.

[0136] The amplifier circuit includes an inverting amplifier circuit.

[0137] like Figure 6 The diagram shown is a structural schematic of another sound-generating device 600 provided in an embodiment of this application. The sound-generating device 600 includes a processing circuit 610, a first loudspeaker 620, and a second loudspeaker 630. The processing circuit 610 includes a first sub-circuit 640 and a second sub-circuit 650.

[0138] The first terminal 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 terminal of the first sub-circuit 640. For example, the first sub-circuit 640 is a wire.

[0139] It should be understood that, in the embodiments of this 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.

[0140] The second sub-circuit 650 includes an amplifier circuit 660 and a phase adjustment circuit 670. The first terminal of the amplifier circuit 660 is configured to receive an input signal, and the amplifier circuit 660 is configured to amplify the amplitude of the input signal to obtain a first amplified signal. The first amplified signal is then transmitted to the phase adjustment circuit 670 through the second terminal of the amplifier circuit 660. The first terminal of the phase adjustment circuit 670 receives the first amplified signal transmitted from the amplifier circuit 660, and the phase adjustment circuit 670 is configured to adjust the phase of the first amplified signal to obtain a second signal. The second signal is then transmitted to the second speaker 630 through the second terminal of the phase adjustment circuit 670.

[0141] Specifically, the amplifier circuit 660 includes a first resistor 661, a second resistor 662, and a first amplifier 663. The first terminal of the first resistor 661 is configured to receive the input signal, and the second terminal of the first resistor 661 is connected to the inverting input terminal of the first amplifier 663. The first terminal of the second resistor 662 is connected to the output terminal of the first amplifier 663, and the second terminal 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.

[0142] Specifically, the phase adjustment circuit 670 includes a third resistor 671, a fourth resistor 672, a fifth resistor 673, a second amplifier 674, and a capacitor 675. The first terminal of the third resistor 671 is connected to the output terminal of the first amplifier 673, and the second terminal of the third resistor 671 is connected to the inverting input terminal of the second amplifier 674. The first terminal of the fourth resistor 672 is connected to the output terminal of the first amplifier 673, and the second terminal of the fourth resistor 672 is connected to the non-inverting input terminal of the second amplifier 674. The first terminal of the fifth resistor 673 is connected to the output terminal of the second amplifier 674, and the second terminal of the fifth resistor 673 is connected to the inverting input terminal of the second amplifier 674. The first terminal of the capacitor 675 is connected to the second terminal of the fourth resistor 672, and the second terminal of the capacitor 675 is grounded. The output terminal of the second amplifier 674 is connected to the second speaker 630.

[0143] Optionally, the first speaker is closer to the user's ear than the second speaker.

[0144] It is understandable that the above examples describe the connection methods of electrical components in each circuit according to the direction of signal transmission.

[0145] Understandably, in the example above, the first sub-circuit in the processing circuit does not process the input signal, while the second sub-circuit performs amplitude amplification and phase processing on the input signal. Thus, the amplitude and phase of the signals received by the first and second speakers are different. The first and second speakers precisely control the sound field based on the received signals, which can reduce the impact on other areas when changing the sound experience in the target area.

[0146] In other examples, the first sub-circuit includes an amplifier circuit configured to amplify the amplitude of the input signal and output the amplified signal as a 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 a second signal to the second speaker.

[0147] The amplifier circuit includes either an inverting amplifier circuit or a non-inverting amplifier circuit.

[0148] The first sub-circuit is an amplifier circuit. The first terminal of the first sub-circuit is configured to receive an input signal, amplify the amplitude of the input signal to obtain a first signal, and output the first signal to the first speaker through the second terminal of the first sub-circuit.

[0149] The second sub-circuit is a phase adjustment circuit. The first terminal 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 terminal of the second sub-circuit.

[0150] like Figure 7 The diagram shown is a structural schematic of another sound-generating device 700 provided in an embodiment of this application. The sound-generating device 700 includes a processing circuit 710, a first loudspeaker 720, and a second loudspeaker 730. The processing circuit 710 includes a first sub-circuit 740 and a second sub-circuit 750.

[0151] Specifically, the amplifier 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 terminal of the second resistor 762 is configured to receive an input signal, and the second terminal of the second resistor 762 is connected to the inverting input terminal of the first amplifier 763. The first terminal of the first resistor 761 is connected to the output terminal of the first amplifier 763, and the second terminal 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.

[0152] 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 terminal of the third resistor 771 is configured to receive the input signal, and the second terminal of the third resistor 771 is connected to the inverting input terminal of the second amplifier 774. The first terminal of the fourth resistor 772 is configured to receive the input signal, and the second terminal of the fourth resistor 772 is connected to the non-inverting input terminal of the second amplifier 774. The first terminal of the fifth resistor 773 is connected to the output terminal of the second amplifier 774, and the second terminal of the fifth resistor 773 is connected to the inverting input terminal of the second amplifier 774. The first terminal of the capacitor 775 is connected to the second terminal of the fourth resistor 772, and the second terminal of the capacitor 775 is grounded. The output terminal of the second amplifier 774 is connected to the second speaker 730.

[0153] Optionally, the first speaker is closer to the user's ear than the second speaker.

[0154] like Figure 8The diagram shown is a structural schematic of another sound-generating device 800 provided in an embodiment of this application. The sound-generating device 800 includes a processing circuit 810, a first loudspeaker 820, and a second loudspeaker 830. The processing circuit 810 includes a first sub-circuit 840 and a second sub-circuit 850.

[0155] Specifically, the amplifier 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.

[0156] 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 first terminal of the fourth resistor 873 is connected to the second terminal of the capacitor 872, and the second terminal of the fourth resistor 873 is grounded. The first terminal of the fifth resistor 874 is connected to the output terminal of the second amplifier 875, 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.

[0157] Optionally, the first speaker is closer to the user's ear than the second speaker.

[0158] Understandably, in the example above, the first sub-circuit in the processing circuit amplifies the input signal, while the second sub-circuit processes the phase of the input signal. Thus, the amplitude and phase of the signals received by the first and second speakers are different. The first and second speakers precisely control the sound field based on the received signals, minimizing the impact on other areas when changing the sound experience in the target area.

[0159] In the embodiments of this application, the amplification circuits in the sound-generating devices 600 and 700 can be implemented using inverting amplifiers. The amplification circuit in the sound-generating device 800 can be implemented using non-inverting amplifiers.

[0160] In the embodiments of this application, the ratio of the first resistor to the second resistor ranges from 1 to 10.

[0161] In the embodiments of this application, the phase adjustment circuits in the sound-generating devices 600, 700 and 800 can be implemented by a full-pass phase shifter.

[0162] 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.

[0163] Based on the above Figures 6-8 As exemplified in the present application, the sound-generating device may further include a first power amplifier and a second power amplifier.

[0164] 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.

[0165] For example, based on the above Figure 6 The sound-generating device in the middle, see Figure 9 This is a schematic diagram of the structure after adding a first power amplifier and a second power amplifier to the sound-generating device.

[0166] 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.

[0167] In the embodiments of this application, the sound-generating device may further include a third loudspeaker.

[0168] 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.

[0169] The amplitudes and phases of the third, second, and first signals are all different.

[0170] For example, such as Figure 10 The diagram shows a schematic of a sound-generating device 1000 including three speakers. 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, second, and third speakers all face the roof of the vehicle.

[0171] 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 described above. Figure 6The aforementioned sound-generating device 600.

[0172] The second sub-circuit includes an amplifier circuit 1 and a phase adjustment circuit 1. The amplifier circuit 1 includes a first resistor 1, a second resistor 1, and a first amplifier 1. The phase adjustment circuit includes a third resistor 1, a fourth resistor 1, a fifth resistor 1, a second amplifier 1, and a capacitor 1. The connection methods of the electrical components in the second sub-circuit and the connection method between the second sub-circuit and the second speaker are described above. Figure 6 The aforementioned sound-generating device 600.

[0173] In this device 1000, one end of the third sub-circuit is connected to the output of the second sub-circuit, and the other end is connected to the third loudspeaker. That is, the third sub-circuit receives the signal processed by the second sub-circuit, and this signal is then processed by the third sub-circuit before being transmitted to the third loudspeaker. The third sub-circuit includes an amplifier circuit 2 and a phase adjustment circuit 2. The amplifier circuit 2 includes a first resistor 2, a second resistor 2, and a first amplifier 2; the phase adjustment circuit includes a third resistor 2, a fourth resistor 2, a fifth resistor 2, a second amplifier 2, and a capacitor 2. The electrical components in the third sub-circuit are connected in the same way as those in the second sub-circuit.

[0174] It is understood that the above-described sound-generating device is merely an example, and the embodiments of this application do not limit the specific implementation of the sound-generating device.

[0175] This application also provides a headrest system, which includes a headrest and a sound-emitting device provided in this application embodiment, the sound-emitting device being disposed close to the headrest.

[0176] In some examples, the headrest system includes a headrest and one or more sound-generating devices. The headrest also includes a cushion with one or more mounting holes, and the sound-generating devices are disposed within the mounting holes.

[0177] For example, a headrest system includes a headrest and two sound-generating devices. The headrest's cushioning body has a mounting hole on each of its left and right sides, and a sound-generating device is installed in each mounting hole. Thus, there is one sound-generating device on each of the left and right sides of the headrest.

[0178] This application also provides a seat, which includes the sound-generating device provided in this application embodiment.

[0179] This application also provides a means of transportation, which includes at least one of the following: a sound-generating device provided in this application, a headrest system provided in this application, or a seat provided in this application.

[0180] Understandably, the above section introduced the basic structure of the sound-generating device. The following section details the design methods for various parameters of the sound-generating device in a headrest system when it is applied. See also... Figure 11 This is a flowchart illustrating a sound-generating device design method provided in an embodiment of this application.

[0181] Taking a headrest system installed in the passenger seat area, comprising two sound-emitting devices positioned on either side of the headrest, as an example, the design method of each component of the sound-emitting device in the headrest system will be explained. For instance, the headrest system includes sound-emitting device 1 and sound-emitting device 2, with sound-emitting device 1 located on the left side of the headrest and sound-emitting device 2 on the right side. The two speakers in sound-emitting device 1 and sound-emitting device 2 are arranged back-to-back, each speaker is a sealed speaker, and the speakers are of the same model.

[0182] S1100: Obtain vehicle data and determine the enclosure size of each speaker in the sound-generating device based on the vehicle data.

[0183] In some examples, the vehicle data refers to the vehicle's cabin data. For instance, this could be obtained through 3D scanning technology or by acquiring a 3D model of the vehicle cabin from the vehicle manufacturer. The dimensions of the headrests in the vehicle cabin are determined based on the vehicle data, and the cabinet dimensions of each speaker in the sound-emitting device are determined based on the headrest dimensions.

[0184] In some examples, the sound-generating device is housed in the headrest, and the speaker enclosure size is determined based on the headrest dimensions of the passenger seat's headrest system. For instance, the headrest is divided into three sections: the left and right sections house the sound-generating device, and the middle section supports the user's head. The size of the sound-generating device is determined based on the headrest dimensions, and the speaker enclosure size is determined based on the sound-generating device dimensions. For example, as... Figure 12 As shown, the dimensions of the sound-generating devices on both sides of the headrest are determined to be L×W×H based on the headrest's dimensions, where L, W, and H are all positive numbers. Since the two speakers in the sound-generating device are arranged back-to-back and are of the same model, the cabinet dimensions of each speaker in the sound-generating device are L×(W / 2)×H.

[0185] In other examples, the sound-generating device is located outside the headrest. The speaker enclosure size in the sound-generating device is determined based on the dimensions of the headrest and the space on both sides of the headrest in the passenger seat headrest system. For example, the width and height of the sound-generating device are determined based on the width and height of the headrest, with the width of the sound-generating device being less than or equal to the width of the headrest, and the height of the sound-generating device being less than or equal to the width of the headrest. The length of the sound-generating device is determined based on the distance from the right side of the headrest to the passenger door, with the length of the sound-generating device being less than the distance from the right side of the headrest to the passenger door. Thus, the dimensions of the sound-generating device are determined, and then the speaker enclosure size is determined based on the dimensions of the sound-generating device.

[0186] Understandably, the speaker enclosure size is determined based on the vehicle's cabin environment. This enclosure size, in turn, determines the size of the speaker unit within the sound-generating device, and consequently, the type of speaker unit used. For example, the speaker unit might be a moving-coil speaker.

[0187] S1101. Determine the target area, non-target area, target requirements, and input signals.

[0188] The target area is the area inside the vehicle cabin where the sound field needs to be controlled to improve the audio experience. The non-target area is the area inside the vehicle cabin outside the target area. When the sound-emitting device emits sound, it can control the sound field in the target area, improving the audio experience for users in that area and minimizing the impact on non-target areas. For example, the target area might be the passenger side, while the non-target areas might be the driver's area and the rear seats.

[0189] In some examples, the target area can be an area actively defined by the user. For instance, the user might trigger a sound-emitting device in the headrest system of the passenger seat to play music.

[0190] In other examples, the target area may be an area that the vehicle controller determines requires sound improvement. For instance, the vehicle controller acquires noise data from microphone sensors in various areas of the vehicle cabin. If it determines that the noise in a certain area exceeds a preset threshold, it sends an input signal to the sound-emitting device in the headrest system of that area to reduce the noise in that area.

[0191] The target requirement refers to the desired sound effect in a pre-defined target area when the sound-emitting device emits sound. For example, target requirements may include target operation and target frequency band. For instance, the target operation might be noise reduction, and the target frequency band might be 88-707Hz. The target requirement can be understood as performing noise reduction processing when the sound frequency in the passenger area falls within the target frequency band.

[0192] The input signal is the signal input to the sound-generating device. For example, the input signal is white noise.

[0193] Optionally, the input signals include input signal 1 for the left-side sound-emitting device in the headrest system and input signal 2 for the right-side sound-emitting device in the headrest system. Input signal 1 and input signal 2 may be the same or different.

[0194] Understandably, by considering the target and non-target areas, we can determine the areas that the sound-generating device should cover when emitting sound, as well as the areas where radiated sound energy needs to be reduced. Based on the target requirements, we can determine the usage requirements of the sound-generating device, and subsequently, based on these requirements, design the parameters of each component of the device to ensure that the device effectively meets the user's expectations.

[0195] S1102. Determine the electroacoustic transfer function of each loudspeaker to each measurement point in the target area and the electroacoustic transfer function of each loudspeaker to each measurement point in the non-target area.

[0196] In some examples, measurement points can be set in both the target and non-target regions to detect the sound pressure level when each speaker is emitting sound, thereby determining the electroacoustic transfer function from each speaker to each measurement point.

[0197] like Figure 13 As shown is a top-down view of the vehicle. Sound-emitting devices are installed on both sides of the headrest in the passenger area, forming a headrest system. The two sound-emitting devices are identical in construction, each consisting of two back-to-back enclosed speakers. One enclosed speaker's outlet faces the front of the vehicle, and the other's outlet faces the rear.

[0198] Users can experience the sound effects inside the vehicle cabin when they are riding in the vehicle. Therefore, measurement points are set according to the position of the user's ears in the vehicle cabin. Figure 13 The black circles in the diagram represent measurement points within the vehicle's cabin. The passenger side area includes two measurement points, the driver's side area includes two measurement points, and the rear passenger area includes multiple measurement points. It should be understood that... Figure 13 The measurement points shown are merely an example. In practical applications, the vehicle cabin may contain more or fewer measurement points, and this application does not impose any limitations on the comparison.

[0199] Based on the preset circuit, determine the electroacoustic transfer function from each loudspeaker to each measurement point.

[0200] The preset circuit is the processing circuit used when designing the sound-generating device. This processing circuit can be as described above. Figure 6 , Figure 7 or Figure 8 Any one of them. Multiple sound-generating devices in the headrest system can use the same processing circuit or different processing circuits.

[0201] It is understandable that this application is intended for use in vehicle cabins, and the circuits used for near-field sound sources in free space can be referenced when designing circuits in vehicle cabins.

[0202] For example, circuit data (such as voltage ratio formulas in circuits) for designing a center-oriented directional sound source in free space can be applied to a vehicle cabin scenario, and a preliminary preset circuit can be constructed based on this data. Subsequently, after determining the preset circuit, actual testing and experiments are conducted to evaluate its performance in the vehicle cabin. The preset circuit is adjusted or optimized based on the test results, and the optimal circuit parameters that meet the target requirements are determined. Based on the optimal circuit parameters, the circuit design of the actual product is constructed to ensure stable operation in the vehicle cabin and to achieve the expected acoustic effects, meeting the user's needs.

[0203] For example, Figure 13 The two sound-generating devices in the middle adopt the above-mentioned Figure 6 The processing circuit is shown. That is, in each sound-emitting device, the speaker with the sound outlet facing the front of the vehicle is connected to the first sub-circuit, and the speaker with the sound outlet facing the rear of the vehicle is connected to the second sub-circuit.

[0204] For the speaker with its left headrest outlet facing the front of the vehicle, the first sub-circuit controls the speaker to emit sound based on the input voltage 1 corresponding to input signal 1 in S1101. The sound pressure level of the speaker is detected at each measurement point in the vehicle cabin. The ratio of the sound pressure level detected at each measurement point to the input voltage 1 is determined as the electroacoustic transfer function from the speaker to each measurement point. For example, if the input voltage 1 is V1, and the sound pressure level detected at the passenger's left ear measurement point is p, then the electroacoustic transfer function (which can be represented by z) from the speaker with its left headrest outlet facing the front of the vehicle to the left ear measurement point is: z = p / V1.

[0205] Understandably, when determining the electroacoustic transfer function of the speaker with the left sound outlet of the headrest facing the front of the vehicle, the circuit in the processing circuit connected to the speaker with the left sound outlet of the headrest facing the front of the vehicle (i.e., the first sub-circuit) is energized, while the other circuits (i.e., the second sub-circuit) are not energized.

[0206] For the speaker with its sound outlet on the left side of the headrest facing the rear of the vehicle, the second sub-circuit controls the speaker to produce sound based on the input voltage 1 corresponding to input signal 1 in S1101. The sound pressure level of the speaker is detected at each measurement point in the vehicle cabin. The ratio of the sound pressure level detected at each measurement point to the input voltage 1 is determined as the electroacoustic transfer function from the speaker to each measurement point.

[0207] Correspondingly, the two speakers on the right side of the headrest determine their electroacoustic transfer function to each measurement point using the method described above. For the speaker with its sound outlet facing the front of the vehicle, the first sub-circuit controls the speaker to emit sound based on the input voltage 2 corresponding to input signal 2 in S1101. The sound pressure level of the speaker is detected at each measurement point in the vehicle cabin. The ratio of the sound pressure level detected at each measurement point to the input voltage 2 is determined as the electroacoustic transfer function from the speaker to each measurement point. For the speaker with its sound outlet facing the rear of the vehicle, the second sub-circuit controls the speaker to emit sound based on the input voltage 2 corresponding to input signal 2 in S1101. The sound pressure level of the speaker is detected at each measurement point in the vehicle cabin. The ratio of the sound pressure level detected at each measurement point to the input voltage 2 is determined as the electroacoustic transfer function from the speaker to each measurement point.

[0208] Understandably, when determining the electroacoustic transfer function from each speaker to each measurement point, the input voltage corresponding to the input signal of the same sound-generating device is the same. The voltage received by each speaker is determined according to the circuit connected to that speaker. By measuring the electroacoustic transfer function from each speaker to each measurement point, the sound transmission within the vehicle can be determined, allowing for accurate determination of the circuit parameters in the subsequent processing circuitry.

[0209] It is understood that the above-mentioned electroacoustic transfer function can be determined through simulation experiments or through actual vehicle testing. The embodiments of this application do not limit the specific method of determining the electroacoustic transfer function.

[0210] S1103. Determine the circuit parameters in the preset circuit based on the electroacoustic transfer function of each loudspeaker to each measurement point in the target area and the electroacoustic transfer function of each loudspeaker to each measurement point in the non-target area.

[0211] The ratio of the voltage received by the two speakers in each sound-generating device of the headrest system is determined according to the preset circuit. For example, based on the above... Figure 6 The circuit shown in the diagram determines the ratio (or voltage ratio) of the voltage received by the speaker with its sound outlet facing the front of the vehicle and the speaker with its sound outlet facing the rear of the vehicle, according to the following formula 1.

[0212]

[0213] Where r is the voltage ratio received by the speaker with its sound outlet facing the front of the vehicle and the speaker with its sound outlet facing the rear of the vehicle, V f V is the voltage received by the speaker in the sound-generating device whose sound outlet faces the front of the vehicle. bThis represents the voltage received by the speaker whose sound outlet faces the rear of the vehicle. R1 is the resistance of the first resistor, and R2 is the resistance of the second resistor. R represents the resistances of the third, fourth, and fifth resistors, and these resistors have the same resistance. 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.

[0214] For example, according to Formula 1 above, the voltage ratio received by the speaker in the left sound-emitting device of the headrest system is determined to be r1, and the voltage ratio received by the speaker in the right sound-emitting device is determined to be r2.

[0215] It is understandable that the voltage received by each loudspeaker in the different processing circuits of the sound-generating device is determined by the circuit connected to that loudspeaker.

[0216] for Figure 6 In the example of the processing circuit and S1101 shown, the circuit connected to the speaker with its sound outlet facing the front of the vehicle (i.e., the first sub-circuit) does not contain resistors, capacitors, or other electrical components. Therefore, the voltage received by the speaker with its 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 speaker with its sound outlet facing the front of the vehicle remains unchanged; the input voltage is simply the voltage received by that speaker. However, the circuit connected to the speaker with its sound outlet facing the rear of the vehicle contains resistors, capacitors, and other electrical components. The voltage received by the speaker with its sound outlet facing the rear of the vehicle is determined based on the connection method of each electrical component.

[0217] For example, if the input voltage to the sound-generating device is V0, then V f =V0; The various parameters are described above and will not be repeated here.

[0218] For example, the input voltage of the sound-emitting device on the left side of the headrest system is V. f1 Then the voltage received by the speaker with its sound outlet facing the front of the car in the left-side sound-emitting device is V. f1 The voltage received by the speaker in the left-side sound-emitting device, whose sound outlet faces the rear of the vehicle, is V. f1 / r1. The input voltage of the right-side sound-emitting device in the headrest system is V. f2 Then the voltage received by the speaker with its sound outlet facing the front of the car in the right-side sound-emitting device is V. f2 The voltage received by the speaker with its sound outlet facing the rear of the vehicle in the right-side sound-emitting device is V. f2 / r2.

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

[0220] Specifically, the average sound pressure in the target area is calculated based on the electroacoustic transfer function of each loudspeaker to the measurement point in the target area and the voltage received by each loudspeaker.

[0221] Based on the example above, the target area (passenger area) includes two measurement points: a left measurement point and a right measurement point. Taking the example that the input voltage received by the left and right sound-emitting devices in the headrest system is the same, the average sound pressure level of the target area is calculated according to the following formula 2.

[0222]

[0223] Where, r t1 Let r be the coordinates of the measurement point on the left. t2 Here are the coordinates of the measurement point on the right. f indicates the speaker's output is facing the front of the vehicle, and b indicates the speaker's output is facing the rear of the vehicle. pt is the average sound pressure level in the target area. p(r t1 ) represents the sound pressure at the measurement point on the left, p(r) t2 () represents the sound pressure at the measurement point on the right. f1 (r t1 Let z be the electroacoustic transfer function from the speaker with its sound outlet facing the front of the vehicle in the left-side sound-emitting device to the measurement point on the left side. b1 (r t1 ) represents the electroacoustic transfer function from the speaker with its sound outlet facing the rear of the vehicle on the left side to the measurement point on the left side; z f2 (r t1 ) represents the electroacoustic transfer function from the speaker with its sound outlet facing the front of the vehicle on the right side to the measurement point on the left side; z b2 (r t1 ) represents the electroacoustic transfer function from the speaker with its sound outlet facing the rear of the vehicle on the right side of the sound-emitting device to the measurement point on the left side. f1 (r t2 Let z be the electroacoustic transfer function from the speaker with its sound outlet facing the front of the vehicle in the left-side sound-emitting device to the measurement point on the right side. b1 (r t2 ) represents the electroacoustic transfer function from the speaker with its sound outlet facing the rear of the vehicle on the left side to the measurement point on the right side; z f2 (r t2 ) represents the electroacoustic transfer function from the loudspeaker with its sound outlet facing the front of the vehicle to the measurement point on the right side; z b2 (r t2V is the electroacoustic transfer function from the speaker with its sound outlet facing the rear of the vehicle in the right-side sound-emitting device to the measurement point on the right side. f1 V is the voltage received by the speaker in the left-side sound-emitting device, whose sound outlet faces the front of the vehicle. f1 / r1 is the voltage received by the speaker in the left-side sound-emitting device, whose outlet faces the rear of the vehicle; V f2 V is the voltage received by the speaker in the right-side sound-emitting device, whose sound outlet faces the front of the vehicle. f2 / r2 represents the voltage received by the speaker in the right-side sound-emitting device facing the rear of the vehicle, and the superscript T indicates the transpose of the matrix.

[0224] Specifically, the average sound pressure in the non-target area is calculated based on the electroacoustic transfer function of each loudspeaker to the measurement point in the non-target area and the voltage received by each loudspeaker.

[0225] Based on the example above, the non-target area (driving area and rear seat area) includes M measurement points, where M is a positive integer. The average sound pressure level of the non-target area is calculated using the following formula 3.

[0226]

[0227] Where, r u1 ,r u2 ,…,r uM This represents the coordinates of M measurement points in the non-target area, such as measurement point 1, measurement point 2, ..., measurement point M. f indicates that the speaker's output is facing the front of the vehicle, and b indicates that the speaker's output is facing the rear of the vehicle. p u p(r) represents the average sound pressure level in the non-target region. u1 p(r) represents the sound pressure at measurement point 1. u2 Let be the sound pressure at measurement point 2, ..., p(r) uM () represents the sound pressure at measurement point M. f1 (r u1 Let z be the electroacoustic transfer function from the speaker with its sound outlet facing the front of the vehicle in the left-side sound-emitting device to measurement point 1. b1 (r u1 (z) represents the electroacoustic transfer function from the speaker with its sound outlet facing the rear of the vehicle in the left-side sound-emitting device to measurement point 1; f2 (r u1 (z) represents the electroacoustic transfer function from the loudspeaker with its sound outlet facing the front of the vehicle in the right-side sound-emitting device to measurement point 1; b2 (r u1 ) represents the electroacoustic transfer function from the speaker with its sound outlet facing the rear of the vehicle in the right-side sound-emitting device to measurement point 1. f1 (r u2 Let z be the electroacoustic transfer function from the speaker with its sound outlet facing the front of the vehicle in the left-side sound-emitting device to measurement point 2. b1 (r u2(z) represents the electroacoustic transfer function from the speaker with its sound outlet facing the rear of the vehicle in the left-side sound-emitting device to measurement point 2; f2 (r u2 (z) represents the electroacoustic transfer function from the speaker with its sound outlet facing the front of the vehicle in the right-side sound-emitting device to measurement point 2; b2 (r u2 Let be the electroacoustic transfer function from the speaker with its sound outlet facing the rear of the vehicle in the right-side sound-emitting device to measurement point 2. ...z f1 (r uM Let z be the electroacoustic transfer function from the loudspeaker (with its sound outlet facing the front of the vehicle) in the left-side sound-emitting device to the measurement point M. f1 (r uM ) represents the electroacoustic transfer function from the speaker with its sound outlet facing the rear of the vehicle in the left-side sound-emitting device to the measurement point M; z f2 (r uM (z) represents the electroacoustic transfer function from the loudspeaker (with its outlet facing the front of the vehicle) in the right-side sound-emitting device to the measurement point M; b2 (r uM V is the electroacoustic transfer function from the speaker in the right-side sound-emitting device, whose sound outlet faces the rear of the vehicle, to the measurement point M. f1 V is the voltage received by the speaker in the left-side sound-emitting device, whose sound outlet faces the front of the vehicle. f1 / r1 is the voltage received by the speaker in the left-side sound-emitting device, whose outlet faces the rear of the vehicle; V f2 V is the voltage received by the speaker in the right-side sound-emitting device, whose sound outlet faces the front of the vehicle. f2 / r2 represents the voltage received by the speaker in the right-side sound-emitting device facing the rear of the vehicle, and the superscript T indicates the transpose of the matrix.

[0228] After determining the average sound pressure in the target area and the average sound pressure in the non-target area, the difference in average sound pressure between the target area and the non-target area is calculated according to the following formula 4.

[0229]

[0230] Where ΔSPL is the average sound pressure difference between the target area and the non-target area, M is the number of measurement points in the non-target area, and 2 is the number of measurement points in the target area. t p is the average sound pressure level in the target area. u This represents the average sound pressure level in the non-target area.

[0231] By iterating through the data, the available R1 / R2 and CR values ​​for both the left and right sound-generating devices are substituted into the above formula to calculate the average sound pressure difference between the target and non-target regions when the preset circuit parameters of the left and right sound-generating devices are set to these values. The circuit parameters of the left sound-generating device corresponding to the maximum average sound pressure difference between the target and non-target regions are then determined as the preset circuit parameters of the left sound-generating device. Similarly, the circuit parameters of the right sound-generating device corresponding to the maximum average sound pressure difference between the target and non-target regions are determined as the preset circuit parameters of the right sound-generating device.

[0232] It should be understood that the maximum average sound pressure difference between the target area and the non-target area indicates that the circuit parameters used at this time produce the best acoustic effect.

[0233] For example, such as Figure 14 The diagram shows the relationship between the simulated circuit parameters and the average sound pressure difference between the target and non-target areas when the left and right sound-generating devices in the headrest system use the same circuit parameters. It can be seen that the range of R1 / R2 is 0-10, and the range of CR (unit: seconds / s) is 1×10⁻⁶. –5 -1×10 –3 The average sound pressure difference (unit: decibel / dB) ranges from 0 to 20. For example... Figure 14 As shown, with the increase of R1 / R2 and CR, the average sound pressure level difference between the target area and the non-target area first increases sharply, and then slowly decreases to a convergent value.

[0234] For example, according to Figure 14 The image shown indicates the circuit parameters corresponding to the maximum average sound pressure level difference between the target area and the non-target area.

[0235] It should be understood that there may be one or more circuit parameters that maximize the average sound pressure level difference between the target and non-target areas. However, the average sound pressure level difference between the target and non-target areas is affected by the cabin environment. If the environment changes, the sound-generating device using these circuit parameters may not provide optimal acoustic performance. The circuit parameters can be within a preset range, such as the circuit parameters corresponding to an average sound pressure level difference between the target and non-target areas exceeding a certain threshold. This preset range provides a degree of tolerance; even if the environment in which the sound-generating device operates or the electrical components of the device age or deviate from their design values, as long as the circuit parameters remain within the preset range, the performance of the sound-generating device will not be significantly affected. Furthermore, electrical components within the preset range can be used, eliminating the need for strict selection of components with specific values ​​during production, thus simplifying the manufacturing process.

[0236] For example, according to Figure 14 The image shown is used to obtain circuit parameters when the average sound pressure level difference between the target area and the non-target area exceeds a certain value (e.g., 15 dB), resulting in the following: Figure 15 The circuit parameter values ​​are shown in the diagram. Figure 15 The diagram shows the circuit parameters corresponding to an average sound pressure level difference greater than 15 dB between the target area and the non-target area in the shaded region. Specifically, R1 / R2 ranges from 1.3 to 5.7, and CR ranges from 1.5 × 10⁻⁶. –4 -7×10 –4 Subsequently, the specific values ​​of the circuit parameters of the left and right sound-generating devices can be taken from the values ​​within the above range.

[0237] It is understandable that the circuit parameters used by the left and right sound-generating devices in the headrest system in the above example are the same. In actual experiments, the circuit parameters used by the left and right sound-generating devices in the headrest system may be different.

[0238] It should be understood that in practical applications, due to factors such as cabin shape, placement of sound-generating devices, or acoustic characteristics, the circuit parameters used by the left and right sound-generating devices in the headrest system are mostly different.

[0239] For example, the circuit parameters in the left-side sound-generating device are R1 / R2 = 1.7, CR = 4.6 × 10⁻⁶. –4 The circuit parameters in the right-side sound-generating device are R1 / R2 = 2.9, CR = 3.4 × 10⁻⁶. –4 At time s, the average sound pressure difference between the target area and the non-target area is at its maximum. Based on these circuit parameters, preset circuits for the left and right sound-generating devices can be designed separately.

[0240] Understandably, in practical applications, the circuit parameters of the sound-generating devices on the left and right sides of the headrest system are determined according to the specific application scenario, and the circuit parameters of the sound-generating devices used in different vehicle cabins may be the same or different.

[0241] S1104. Construct a sound-generating device based on circuit parameters.

[0242] Based on the determined circuit parameters, a processing circuit is constructed, and the processing circuit is connected to the corresponding speaker to form a sound-generating device.

[0243] Thus, by completing the above steps, the design of the sound-generating device in the headrest system is finished. The sound-generating device can then be used directly, thereby reducing the impact on other areas when changing the sound effect experience in the target area.

[0244] Understandably, the above examples are based on Figure 6Taking the processing circuit in the example as an example, in practical applications, it can also be set up according to... Figure 7 or Figure 8 The design focuses on the processing circuitry. When designing a sound-generating device based on other processing circuits, the voltage ratio received by the speaker with its sound outlet facing the front of the vehicle differs from that of the speaker with its sound outlet facing the rear of the vehicle due to the different circuit structures. During the design process, only the voltage ratio is changed, while other design procedures remain unchanged.

[0245] It is understandable that, according to the above description, the voltage received by each loudspeaker in the different processing circuits of the sound-generating device is determined by the circuit connected to that loudspeaker. Therefore, the voltage received by each loudspeaker in the sound-generating device will be different depending on the processing circuit.

[0246] Correspondingly, for Figure 7 The processing circuit shown, based on the example in S1103 above, has an input voltage of V0 input to the sound-generating device. The various parameters are described above and will not be repeated here.

[0247] for Figure 7 The voltage ratio formula for the speaker with its sound outlet facing the front of the vehicle and the speaker with its sound outlet facing the rear of the vehicle in the processing circuit shown is the same as Formula 1 above.

[0248] Correspondingly, for Figure 8 The processing circuit shown, based on the example in S1103 above, has an input voltage of V0 input to the sound-generating device. The various parameters are described above and will not be repeated here.

[0249] for Figure 8 In the processing circuit shown, the voltage ratio received by the speaker with its sound outlet facing the front of the vehicle and the speaker with its sound outlet facing the rear of the vehicle in the sound-generating device can be determined by formula 5.

[0250]

[0251] Where r is the voltage ratio received by the speaker with its sound outlet facing the front of the vehicle and the speaker with its sound outlet facing the rear of the vehicle, V f V is the voltage received by the speaker in the sound-generating device whose sound outlet faces the front of the vehicle. b R is the voltage received by the speaker whose sound outlet faces the rear of the vehicle; R1 is the resistance of the first resistor, R2 is the resistance of the second resistor, and R is the resistance of the third, fourth, and fifth resistors, all of which have the same resistance. 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.

[0252] It is understood that the above example is based on the sound-generating device having two loudspeakers. If the sound-generating device has multiple loudspeakers, the proportion of voltage received by each loudspeaker is determined according to the connection method of the processing circuit in each sound-generating device.

[0253] Correspondingly, for Figure 10 The processing circuit shown, based on the example in S1103 above, if the values ​​of the electrical components in the second sub-circuit are the same as the values ​​of the electrical components in the third sub-circuit, then the input voltage to the sound-generating device is V0, and the voltage received by the first speaker is V1 = V0, while the voltage received by the second speaker is... The voltage received by the third speaker is The various parameters are described above and will not be repeated here.

[0254] For example, such as Figure 16 As shown, Figure 16 (a) is a sound pressure level distribution diagram in the vehicle cabin when the headrest system's sound-emitting device emits sound before the front passenger seat uses the headrest system provided in this application. The vehicle cabin includes the driver's area 1601, the front passenger area 1602, and the rear area 1603. Figure 16 Image (b) shows the sound pressure level distribution within the vehicle cabin when the headrest system's sound-emitting device emits sound after the front passenger seat is equipped with the headrest system provided in this application. The vehicle cabin includes the driver's area 1604, the front passenger area 1605, and the rear passenger area 1606. It is evident that after using the headrest system provided in this application, the sound pressure level in the rear passenger area and the driver's area is significantly reduced, and the average sound pressure level difference between the front passenger area and other areas is greater than the average sound pressure level difference between the front passenger area and other areas before using the headrest system. The headrest system provided in this application can significantly reduce the impact on non-target areas.

[0255] The foregoing mainly describes the solutions provided by the embodiments of this application from a methodological perspective. To achieve the above functions, it includes corresponding hardware structures and / or software modules for executing each function. Those skilled in the art should readily recognize that, based on the units and algorithm steps of the examples described in conjunction with the embodiments disclosed herein, this application can be implemented in hardware or a combination of hardware and computer software. Whether a function is executed in hardware or by computer software driving hardware depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0256] Based on the same inventive concept, embodiments of this application provide a design for a sound-generating device. For example... Figure 17The diagram shown is a structural schematic of a sound-generating device design apparatus provided in an embodiment of this application. For example, the sound-generating device design apparatus 1700 may specifically include: a processing module 1701 and an acquisition module 1702. This sound-generating device design apparatus 1700 is used to perform the above-described... Figure 11 The method described in the embodiments is a sound-generating device design method.

[0257] The processing module 1701 is used by the sound-generating device design device 1700 to execute... Figure 11 The processing module 1701 is configured to determine the enclosure size of each loudspeaker in the sound-generating device based on the vehicle data; the processing module 1701 is also configured to determine the target area, the non-target area, the target requirement, and the input signal; the processing module 1701 is also configured to determine the electroacoustic transfer function from each loudspeaker to each measurement point in the target area and the electroacoustic transfer function from each loudspeaker to each measurement point in the non-target area; the processing module 1701 is also configured to determine the circuit parameters in the preset circuit based on the electroacoustic transfer function from each loudspeaker to each measurement point in the target area and the electroacoustic transfer function from each loudspeaker to each measurement point in the non-target area; the processing module 1701 is also configured to construct the sound-generating device based on the circuit parameters.

[0258] The acquisition module 1702 is used to support the execution of the sound-generating device design device 1700. Figure 11 The acquisition module 1702 is used to acquire vehicle data. In this embodiment, the acquisition module 1702 is used to acquire vehicle data.

[0259] Optionally, the sound-generating device design device 1700 may also include a display module. Figure 17 (Not shown in the image), the display module is used to display the constructed sound-generating device. The sound-generating device design device 1700 may also include a storage module (…). Figure 17 (Not shown in the image), this storage module stores a program or instruction. When the processing module 1701 and the acquisition module 1702 execute the program or instruction, it causes... Figure 17 The sound-generating device design apparatus 1700 shown can perform the sound-generating device design method described in the above method embodiments. Of course, the sound-generating device design apparatus 1700 may also include other modules, or it may include even fewer modules. This application embodiment does not limit this.

[0260] The operation and / or function of each unit in the sound-generating device design device 1700 are respectively to realize the corresponding process of the sound-generating device design method described in the above method embodiments. All relevant contents of each step involved in the above method embodiments can be referred to the functional description of the corresponding functional unit. The technical effect of the sound-generating device design device can be referred to the technical effect of the method described in the above method embodiments. For the sake of brevity, it will not be repeated here.

[0261] This application also provides a chip system, such as... Figure 18 As shown, the chip system 1800 includes at least one processor 1801 and at least one interface circuit 1802. As an example, when the chip system 1800 includes a processor and an interface circuit, the processor can be... Figure 18 The processor 1801 shown in the solid box (or the processor 1801 shown in the dashed box) can have an interface circuit that can be... Figure 18 The interface circuit 1802 is shown in the solid box (or the dashed box). When the chip system 1800 includes two processors and two interface circuits, the two processors include... Figure 18 The processor 1801 shown in the solid box and the processor 1801 shown in the dashed box, the two interface circuits include Figure 18 Interface circuit 1802 is shown in both solid and dashed boxes. No limitations are imposed on this.

[0262] Processor 1801 and interface circuit 1802 can be interconnected via lines. For example, interface circuit 1802 can be used to receive signals. As another example, interface circuit 1802 can be used to send signals to other devices (e.g., processor 1801). Exemplarily, interface circuit 1802 can read instructions stored in memory and send the instructions to processor 1801. When the instructions are executed by processor 1801, the steps in the above embodiments can be performed. Of course, the chip system may also include other discrete devices, and this application embodiment does not specifically limit this.

[0263] Optionally, there can be one or more processors in the chip system. The processor can be implemented in hardware or software. When implemented in hardware, the processor can be a logic circuit, integrated circuit, etc. When implemented in software, the processor can be a general-purpose processor that reads software code stored in memory.

[0264] Optionally, the chip system may also include a memory ( Figure 18 (As shown in the image), there can be one or more memories. Memories can be integrated with the processor or separated from it; this application does not limit this. For example, a memory can be a non-transient processor, such as read-only memory (ROM), which can be integrated with the processor on the same chip or disposed on different chips. This application does not specifically limit the type of memory or the arrangement of the memory and processor.

[0265] For example, the chip system may 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.

[0266] It should be understood that each step in the above method embodiments can be completed by integrated logic circuits in the processor hardware or by instructions in software form. The method steps disclosed in the embodiments of this application can be directly manifested as being executed by a hardware processor, or being executed by a combination of hardware and software modules in the processor.

[0267] This application also provides a computer-readable storage medium for storing one or more computer programs, the one or more computer programs including instructions that, when executed by a computer, cause the computer to perform the corresponding flow of the method described in the above embodiments.

[0268] Computer-readable storage media include, but are not limited to, any of the following: USB flash drive, portable hard drive, read-only memory (ROM), random access memory (RAM), magnetic disk or optical disk, and other media capable of storing program code.

[0269] In some embodiments, the disclosed method may 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 art.

[0270] This application also provides a computer program product, which includes a computer program or instructions that, when run on a computer, cause the computer to execute the corresponding process of the method described in the above embodiments.

[0271] In addition, this application also provides an apparatus, which may specifically be a chip, component or module. The apparatus may include a connected processor and a memory. The memory is used to store computer execution instructions. When the apparatus is running, the processor can execute the computer execution instructions stored in the memory to cause the apparatus to perform the corresponding process of the method described in the above embodiments.

[0272] In addition, this application also provides a system, which may specifically be a chip, component or module. The system may include a connected processor and a memory. The memory is used to store computer execution instructions. When the system is running, the processor can execute the computer execution instructions stored in the memory to make the system execute the corresponding process of the method described in the above embodiments.

[0273] The apparatus, computer-readable storage medium, computer program product, or chip provided in the embodiments of this application are all used to execute the corresponding methods provided above. Therefore, the beneficial effects they can achieve can be referred to the beneficial effects of the corresponding methods provided above, and will not be repeated here.

[0274] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A sound producing device, characterized by, Comprising: processing circuitry, a first speaker, and a second speaker; the processing circuitry 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 speaker; the second sub-circuit is configured to receive the input signal, and output a second signal to the second speaker; wherein the first signal and the second signal are different in phase.

2. The apparatus of claim 1, wherein, the first sub-circuit is configured to output the input signal as the first signal to the first speaker; the second sub-circuit comprises 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 an 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 an adjusted signal as the second signal to the second speaker.

3. The apparatus of claim 2, wherein, 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, and 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, and 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, 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 connected to the output terminal of the first amplifier, 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.

4. The apparatus of claim 1, wherein, the first sub-circuit comprises an amplification circuit, the amplification circuit being configured to amplify the amplitude of the input signal, and output an amplified signal as the first signal to the first speaker; the second sub-circuit comprises a phase adjustment circuit, the phase adjustment circuit being configured to adjust the phase of the input signal, and output an adjusted signal as the second signal to the second speaker.

5. The apparatus of claim 4, wherein, 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 adjusting 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.

6. The apparatus of claim 4, wherein, The amplifying 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 adjusting 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.

7. The apparatus of any one of claims 1 to 6, wherein, The sound outlet of the first loudspeaker faces a direction different from that of the sound outlet of the second loudspeaker.

8. The apparatus of any one of claims 1 to 6, wherein, The sound outlet of the first loudspeaker faces a direction same as that of the sound outlet of the second loudspeaker, and the sound outlet of the first loudspeaker and the sound outlet of the second loudspeaker are not located in the same plane.

9. The apparatus of any one of claims 1 to 8, wherein, The sound generating device further comprises a first cabinet and a second cabinet, the first loudspeaker is arranged in the first cabinet, and the second loudspeaker is arranged in the second cabinet.

10. The apparatus of any one of claims 1 to 8, wherein, The sound generating device further comprises a third cabinet, the third cabinet comprises a partition plate, and the first loudspeaker and the second loudspeaker are arranged in the third cabinet and located on two sides of the partition plate.

11. The apparatus of any one of claims 1 to 10, wherein, The sound generating device further comprises a third loudspeaker. The processing circuit further comprises a third sub-circuit configured to receive the input signal and output a third signal to the third loudspeaker. The phases of the first signal, the second signal and the third signal are different.

12. A headrest system characterized by, The sound generating device of any one of claims 1 to 11 is arranged close to the headrest. The seat comprises the sound generating device of any one of claims 1 to 11.

13. A seat, characterized by ​ 14. A vehicle, characterized by at least one of the sound producing device of any one of claims 1 to 11, or the headrest system of claim 12, or the seat of claim 13.

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