Directional sound production headrest and directional sound production system
The directional sound-emitting headrest uses ultrasonic modules and phased array control to concentrate sound within a small area, addressing poor privacy in existing headrests by making sound inaudible to co-passengers.
Patent Information
- Application Number
- CN202420632088.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-28
- Publication Date
- 2024-12-31
- Estimated Expiration
- 2034-03-28
AI Technical Summary
Existing car headrests with traditional speakers or directional functions using ultrasonic sensors fail to provide effective privacy due to spherical sound characteristics and large sound reflection areas, leading to poor privacy for passengers.
A directional sound-emitting headrest equipped with first and second ultrasonic modules, controlled by a driving module, to emit sound directly to the human ear, using ultrasonic arrays and a phased array control system to concentrate sound within a small area, enhancing privacy.
The headrest achieves directional sound emission, ensuring sound is inaudible to the co-driver, providing enhanced privacy by attenuating sound by 15-20 dB per meter, thus improving privacy in vehicle compartments.
Smart Images
Figure CN222283470U_ABST
Abstract
Description
Technical Field
[0001] The embodiments of the utility model relate to the technical field of directional sound generation, and in particular to a directional sound generation headrest and a directional sound generation system. Background Art
[0002] With the development of society, cars have gradually become an indispensable means of transportation for families, and the need for independent private space in different positions in the car has gradually been put on the agenda. Imagine if there are 5 people sitting in the car, each listening to their own music without interfering with each other, which is a very good sound experience.
[0003] However, currently the most popular headrests on the market are directional headrests made with traditional speakers and played through different partitions. However, due to the spherical sound characteristics of the speakers, people sitting in the front passenger seat can still hear the music played in other positions, so the privacy effect is not obvious. There are also some patents that use headrests made with directional functions similar to ultrasonic sensors, but the privacy effect is still not obvious. The range area of this type of headrest is a large area with an angle, which is easy to cause sound reflection and diffusion; it does not envelop a small area, and the privacy is also poor. Utility Model Content
[0004] The utility model provides a directional sound headrest and a directional sound system, which can realize true directional sound, so that the privacy between different seats in the car is enhanced, and people in the space will not be disturbed by sounds from other positions, thereby enhancing privacy.
[0005] According to one aspect of the utility model, a directional sound-emitting headrest is provided, the directional sound-emitting headrest comprising: a headrest, a first ultrasonic module, a second ultrasonic module and a control and driving module;
[0006] Receiving areas are provided on both sides of the headrest, and the receiving areas are used to accommodate the first ultrasonic module and the second ultrasonic module;
[0007] The first ultrasonic module and the second ultrasonic module are respectively arranged on the inner frame of the headrest and correspond to the receiving area and the position of the human ear respectively, and the first ultrasonic module and the second ultrasonic module are used as sound-generating components;
[0008] The control and driving module is electrically connected to the first ultrasonic module and the second ultrasonic module, and is used to drive the first ultrasonic module and the second ultrasonic module to emit sound in a directionally directed manner.
[0009] Optionally, the directional sound-emitting headrest further includes at least two upper shells and a lower shell, and the upper shell and the lower shell are used to protect the first ultrasonic module and the second ultrasonic module.
[0010] Optionally, the first ultrasonic module and the second ultrasonic module both include ultrasonic arrays, and the ultrasonic arrays are used as sound-emitting components.
[0011] Optionally, the ultrasonic array includes 35 ultrasonic sensors.
[0012] Optionally, the operating frequency of the ultrasonic sensor is 40KHZ or 45KHZ.
[0013] Optionally, the first ultrasonic module and the second ultrasonic module further include: a DCDC conversion unit, a low voltage drop linear regulator, a Bluetooth module, an FPGA chip and a driver chip;
[0014] The DCDC conversion unit is connected to the low voltage drop linear regulator and the driving chip, and the DCDC conversion unit is used for voltage conversion;
[0015] The low voltage drop linear regulator is connected to the Bluetooth module and the FPGA chip, and the low voltage drop linear regulator is used to provide a stable DC voltage output;
[0016] The Bluetooth module, the FPGA chip, the driver chip and the ultrasonic array are connected in sequence. The Bluetooth module is used for wireless communication, and the FPGA chip and the driver chip are used to drive the ultrasonic array to emit sound in a directional manner.
[0017] Optionally, it further includes a plurality of driving units, wherein the driving units are connected between the driving chip and the ultrasonic sensor;
[0018] The driving unit includes an inductor and a capacitor, a first end of the inductor is connected to the driving chip, a second end of the inductor is connected to a first end of the ultrasonic sensor and a first end of the capacitor, and a second end of the capacitor is connected to a second end of the ultrasonic sensor and then grounded.
[0019] Optionally, the distance between adjacent ultrasonic sensors is 1 / 2 of the wavelength of the ultrasonic sensors.
[0020] Optionally, for every additional meter of distance between the directional sound-emitting headrest and the human ear, the sound decibel is attenuated by 15dB-20dB.
[0021] According to another aspect of the present invention, a directional sound emission system is provided, and the directional sound emission system comprises the directional sound emission headrest as described in any one of the above aspects.
[0022] The technical solution of the embodiment of the utility model improves the existing headrest to make a headrest with a small envelope range of the human ear area that is more private. The control and drive module drives the first ultrasonic module and the second ultrasonic module to directional sound, so that the sound of the first ultrasonic module and the second ultrasonic module is concentrated in a small range of the human ear through the receiving areas set on both sides of the headrest, so as to achieve better privacy. The sound emitted by the headrest on the main driving position is basically inaudible to the co-driver. In summary, the utility model solves the problem that the existing headrests have unclear privacy effects and poor privacy.
[0023] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present utility model, nor are they intended to limit the scope of the present utility model. Other features of the present utility model will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS
[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.
[0025] Figure 1 It is a structural schematic diagram of a directional sound-emitting headrest provided according to an embodiment of the utility model;
[0026] Figure 2 It is an exploded diagram of a housing structure provided according to an embodiment of the utility model;
[0027] Figure 3 It is a control logic block diagram of an overall ultrasonic module provided according to an embodiment of the utility model;
[0028] Figure 4 It is a schematic diagram of a driving ultrasonic array provided according to an embodiment of the utility model. DETAILED DESCRIPTION
[0029] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.
[0030] It should be noted that the terms "first", "second", etc. in the specification and claims of the utility model and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the utility model described here can be implemented in an order other than those illustrated or described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.
[0031] Figure 1 is a schematic diagram of a directional sound-emitting headrest provided according to an embodiment of the utility model, with reference to Figure 1 The embodiment of the utility model provides a directional sound-emitting headrest, which includes: a headrest 10, a first ultrasonic module 20, a second ultrasonic module 30 and a control and driving module 40; a receiving area 11 is set on both sides of the headrest 10, and the receiving area 11 is used to accommodate the first ultrasonic module 20 and the second ultrasonic module 30; the first ultrasonic module 20 and the second ultrasonic module 30 are respectively arranged on the inner frame of the headrest 10, and correspond to the positions of the receiving area and the human ear respectively, and the first ultrasonic module and the second ultrasonic module are used as sound-emitting components; the control and driving module 40 is electrically connected to the first ultrasonic module 20 and the second ultrasonic module 30, and the control and driving module 40 is used to drive the first ultrasonic module 20 and the second ultrasonic module 30 to directional sound.
[0032] Specifically, the headrest 10 can be a traditional headrest and modified. The sponge inside the traditional headrest can be made into a receiving area 11 based on the size of the first ultrasonic module 20 and the second ultrasonic module 30, or the sponge can be made into a honeycomb shape according to the diameter of the ultrasonic sensor in the ultrasonic module, so as to facilitate better transmission of sound. The control and drive module 40 is electrically connected to the first ultrasonic module 20 and the second ultrasonic module 30 as the sound-emitting components to drive them to directional sound. The first ultrasonic module 20 and the second ultrasonic module 30 are respectively arranged in the receiving area 11 on both sides of the headrest 10, and the position corresponds approximately to the position of the human ear. The sound of the first ultrasonic module 20 and the second ultrasonic module 30 is concentrated at the left and right human ear positions of the headrest 10, thereby achieving the effect of directional envelope sound. The corresponding audio data emits the sound through the principle of high-frequency modulation and demodulation of the control and drive module 40.
[0033] The technical solution of the embodiment of the utility model improves the existing headrest to make a headrest with a small envelope range of the human ear area that is more private. The control and drive module drives the first ultrasonic module and the second ultrasonic module to directional sound, so that the sound of the first ultrasonic module and the second ultrasonic module is concentrated in a small range of the human ear through the receiving areas set on both sides of the headrest, so as to achieve better privacy. The sound emitted by the headrest on the main driving position is basically inaudible to the co-driver. In summary, the utility model solves the problem that the existing headrests have unclear privacy effects and poor privacy.
[0034] Figure 2 This is an exploded view of a housing structure provided according to an embodiment of the utility model, referring to Figure 2 Optionally, the directional sound-emitting headrest further includes at least two upper shells 50 and a lower shell 60 , and the upper shell 50 and the lower shell 60 are used to protect the first ultrasonic module 20 and the second ultrasonic module.
[0035] Specifically, the upper shell 50 and the lower shell 60 are mainly used to protect the first ultrasonic module 20 and the second ultrasonic module from being squeezed.
[0036] The upper shell 50 and the lower shell 60 can be designed as T-shaped protective brackets to ensure that the tolerance fully meets the requirements; if the tolerance is too large, the protection is insufficient; if the tolerance is too small, it will easily cause the ultrasonic wave to hit the bracket and produce a harsh sound.
[0037] Optionally, the first ultrasonic module and the second ultrasonic module both include ultrasonic arrays, and the ultrasonic arrays are used as sound-emitting components.
[0038] Figure 3 This is a control logic block diagram of an ultrasonic module as a whole provided according to an embodiment of the present utility model, referring to Figure 3 Optionally, the first ultrasonic module and the second ultrasonic module further include: a DCDC conversion unit 21, a low voltage drop linear regulator 22, a Bluetooth module 23, an FPGA chip 24 and a driver chip 25;
[0039] The DCDC conversion unit 21 is connected to the low voltage drop linear regulator 22 and the driving chip 25, and the DCDC conversion unit 21 is used for voltage conversion;
[0040] The low voltage drop linear regulator 22 is connected to the Bluetooth module 23 and the FPGA chip 24, and the low voltage drop linear regulator 22 is used to provide a stable DC voltage output;
[0041] The Bluetooth module 23, the FPGA chip 24, the driver chip 25 are connected to the ultrasonic array in sequence. The Bluetooth module 23 is used for wireless communication, and the FPGA chip 24 and the driver chip 25 are used to drive the ultrasonic array to emit directionally sound.
[0042] Figure 4 is a schematic diagram of a driving ultrasonic array according to an embodiment of the utility model, referring to Figure 4 , optionally, further comprising a plurality of driving units 26, the driving units 26 being connected between the driving chip 25 and the ultrasonic sensor;
[0043] The driving unit 26 includes an inductor and a capacitor. The first end of the inductor is connected to the driving chip 25, the second end of the inductor is connected to the first end of the ultrasonic sensor and the first end of the capacitor, and the second end of the capacitor is connected to the second end of the ultrasonic sensor and then grounded.
[0044] Optionally, the ultrasonic array includes 35 ultrasonic sensors.
[0045] Optionally, the operating frequency of the ultrasonic sensor is 40KHZ or 45KHZ.
[0046] Specific, combined Figure 3 and Figure 4 Each ultrasonic module uses 35 40KHZ or 45KHZ ultrasonic sensors (X1-X35) on the front, arranged in a regular array. The control and drive module can drive the array after filtering through the inductor and capacitor in the driver chip 25 and the peripheral drive unit 26. The driver chip 25 can drive 70 ultrasonic sensors; the FPGA chip 24 uses the control principle of the phased array to concentrate the sound of the two groups of 35 ultrasonic sensors on the left and right sides of the headrest, thereby achieving the effect of directional envelope sound. The corresponding audio data emits the sound through the principle of high-frequency modulation and demodulation.
[0047] It should be noted that Figure 4 The electrical nodes with the same label in the circuit are electrically connected, such as DOUT 0, DOUT1, DOUT 3, DOUT 15, DOUT 33, DOUT 34, DOUT 35, etc. Figure 4 Electrical nodes with the same Chinese characters are electrically connected to each other. This is done to make the drawing clear.
[0048] Optionally, the distance between adjacent ultrasonic sensors is 1 / 2 of the wavelength of the ultrasonic sensors.
[0049] Specifically, the most important thing about ultrasonic arrangement is to ensure reasonable spacing. The distance range between adjacent ultrasonic sensors can be 1 / 2 of the wavelength of the ultrasonic sensor, otherwise it will cause waveform distortion and sound loss. In addition, it is also conducive to directional control of circuit components.
[0050] Optionally, for every additional meter of distance between the directional sound-emitting headrest and the human ear, the sound decibel is attenuated by 15dB-20dB.
[0051] Specifically, the directional sound headrest can achieve a sound decibel attenuation of 15dB-20dB for every 1m increase in distance. The sound emitted by the headrest at the main driver's seat can basically be inaudible to the co-driver.
[0052] An embodiment of the utility model further provides a directional sound-emitting system, which includes the directional sound-emitting headrest provided by any embodiment of the utility model.
[0053] Since the directional sound emission system includes the directional sound emission headrest provided by any embodiment of the utility model, the beneficial effects of the above-mentioned directional sound emission system and the directional sound emission headrest are the same, which will not be repeated here.
[0054] The above specific implementations do not constitute a limitation on the protection scope of the present utility model. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present utility model shall be included in the protection scope of the present utility model.
Claims
1. A directional sound-emitting headrest, characterized in that: include: A headrest, a first ultrasonic module, a second ultrasonic module, and a control and drive module; Receiving areas are provided on both sides of the headrest, and the receiving areas are used to accommodate the first ultrasonic module and the second ultrasonic module; The first ultrasonic module and the second ultrasonic module are respectively arranged on the inner frame of the headrest and correspond to the receiving area and the position of the human ear respectively, and the first ultrasonic module and the second ultrasonic module are used as sound-generating components; The control and driving module is electrically connected to the first ultrasonic module and the second ultrasonic module, and is used to drive the first ultrasonic module and the second ultrasonic module to emit sound in a directionally directed manner.
2. The directional sound-emitting headrest according to claim 1, characterized in that: It also includes at least two upper shells and a lower shell, and the upper shell and the lower shell are used to protect the first ultrasonic module and the second ultrasonic module.
3. The directional sound-emitting headrest according to claim 1, characterized in that: The first ultrasonic module and the second ultrasonic module both include an ultrasonic array, and the ultrasonic array is used as a sound-generating component.
4. The directional sound-emitting headrest according to claim 3, characterized in that: The ultrasonic array includes 35 ultrasonic sensors.
5. The directional sound-emitting headrest according to claim 4, characterized in that: The operating frequency of the ultrasonic sensor is 40KHZ or 45KHZ.
6. The directional sound-emitting headrest according to claim 4, characterized in that: The first ultrasonic module and the second ultrasonic module further include: a DCDC conversion unit, a low voltage drop linear regulator, a Bluetooth module, an FPGA chip and a driver chip; The DCDC conversion unit is connected to the low voltage drop linear regulator and the driving chip, and the DCDC conversion unit is used for voltage conversion; The low voltage drop linear regulator is connected to the Bluetooth module and the FPGA chip, and the low voltage drop linear regulator is used to provide a stable DC voltage output; The Bluetooth module, the FPGA chip, the driver chip and the ultrasonic array are connected in sequence. The Bluetooth module is used for wireless communication, and the FPGA chip and the driver chip are used to drive the ultrasonic array to emit directionally sound.
7. The directional sound-emitting headrest according to claim 6, characterized in that: It also includes a plurality of driving units, wherein the driving units are connected between the driving chip and the ultrasonic sensor; The driving unit includes an inductor and a capacitor, a first end of the inductor is connected to the driving chip, a second end of the inductor is connected to a first end of the ultrasonic sensor and a first end of the capacitor, and a second end of the capacitor is connected to a second end of the ultrasonic sensor and then grounded.
8. The directional sound-emitting headrest according to claim 4, characterized in that: The distance between adjacent ultrasonic sensors is 1 / 2 of the wavelength of the ultrasonic sensors.
9. The directional sound-emitting headrest according to claim 1, characterized in that: For every additional meter of distance between the directional sound-emitting headrest and the human ear, the sound decibel is attenuated by 15dB-20dB.
10. A directional sound system, characterized in that: A directional sound-emitting headrest comprising the directional sound-emitting headrest described in any one of claims 1 to 9.