Automotive headrest, automotive audio system, and automotive privacy call system
By installing a speaker array inside the car headrest, the problem of sound interference between different seating areas in the car is solved, achieving sound reduction and sound effect improvement in private areas.
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- SUZHOU SONAVOX ELECTRONICS CO LTD
- Filing Date
- 2025-03-31
- Publication Date
- 2026-06-18
AI Technical Summary
Sound interference between different seating areas inside a car is severe, affecting the user experience. Existing technologies are insufficient to effectively reduce sound leakage from private areas to other areas.
It adopts a car headrest design, with multiple speaker arrays inside the headrest. By combining the speaker arrays, it plays target sounds and cancels out other sounds, reducing the propagation of sound between different seating areas.
It effectively reduces the mutual sound interference between different seating areas in the car, achieving privacy and good sound effects in each area, and reducing interference between neighboring seats.
Smart Images
Figure CN2025086070_18062026_PF_FP_ABST
Abstract
Description
Car headrests, car audio systems, and car privacy calling systems Cross-references to related applications
[0001] This application claims priority to Chinese patent application No. CN 2024230602979, filed on December 11, 2024, the entire contents of which are incorporated herein by reference. Technical Field
[0002] This disclosure relates to a car headrest and a car audio system, and a car privacy call system. Background Technology
[0003] A car cabin is a relatively small, enclosed space where everyone's voice can be heard by their neighbor, offering virtually no privacy; moreover, it causes interference, becoming a source of noise. A typical application scenario is the need for the driver to listen to navigation voice commands while the passenger listens to music. For this scenario, the mainstream solution currently uses speakers mounted on the doors and the dashboard to simultaneously achieve these two functions. However, this solution interferes with the experience for both the driver and passenger. While some solutions exist for partitioning the interior space (cabin), almost no explanation is provided regarding speaker placement.
[0004] The information disclosed in the background section is only intended to enhance the understanding of the background of this application, and therefore may include information that does not constitute prior art known to those skilled in the art. Summary of the Invention
[0005] This disclosure relates to a car headrest and a car audio system and a car privacy call system using the car headrest, which can reduce the mutual influence of sound between different seating areas in a car, especially reduce the leakage of sound from a target private area to other areas.
[0006] The first aspect of this disclosure provides an automotive headrest comprising:
[0007] The main body has a left extension and a right extension that are spaced apart from each other;
[0008] A first loudspeaker array is disposed in the left extension, and the first loudspeaker array includes m loudspeakers;
[0009] A second loudspeaker array is provided in the left extension, and the second loudspeaker array includes n loudspeakers;
[0010] A third loudspeaker array is disposed in the right extension, the third loudspeaker array comprising p loudspeakers; and
[0011] A fourth speaker array is provided in the right extension, and the fourth speaker array includes q speakers;
[0012] Where m, n, p, and q are all positive integers greater than 1;
[0013] The first speaker array, the second speaker array, the third speaker array, and the fourth speaker array are arranged sequentially from left to right. The front of the speakers of the second speaker array and the front of the speakers of the third speaker array face each other and form a space between them corresponding to a person's head. The front of the speakers of the first speaker array faces the outside of the car headrest, and the front of the speakers of the fourth speaker array faces the outside of the car headrest.
[0014] In one embodiment, the m loudspeakers are arranged sequentially in the vertical direction, the n loudspeakers are arranged sequentially in the vertical direction, the p loudspeakers are arranged sequentially in the vertical direction, and the q loudspeakers are arranged sequentially in the vertical direction.
[0015] In one embodiment, the vibration axes of the speakers in the first speaker array and the second speaker array are parallel to each other, and their speakers face opposite directions; the vibration axes of the speakers in the third speaker array and the fourth speaker array are parallel to each other, and their speakers face opposite directions.
[0016] In one embodiment, m and n are equal, and each speaker in the first speaker array and one speaker in the second speaker array correspond to each other and are equal.
[0017] In one embodiment, p and q are equal, and each speaker in the third speaker array corresponds to and is equal to one speaker in the fourth speaker array.
[0018] In one embodiment, m is less than n, and p is greater than q.
[0019] In one embodiment, 2≤m≤10, 3≤n≤10, 3≤p≤10, and 2≤q≤10. In a specific embodiment, m is between 2 and 6, n is between 3 and 6, p is between 3 and 6, and q is between 2 and 6.
[0020] In one specific embodiment, m=q, n=p.
[0021] In one embodiment, the main body has a central portion, the left extension is located on the left side of the main body, the right extension is located on the right side of the main body, and the left and right extensions of the main body protrude forward relative to the central portion of the main body, thereby forming a recessed portion suitable for accommodating a human head.
[0022] In one embodiment, the left extension and the right extension each have an inner surface, which are disposed opposite to each other. The n speakers of the second speaker array are disposed in the left extension, and the inner surface of the left extension is provided with a plurality of sound transmission holes corresponding to the n speakers. The p speakers of the third speaker are disposed in the right extension, and the inner surface of the right extension is provided with a plurality of sound transmission holes corresponding to the p speakers.
[0023] In one embodiment, the left extension has an outer surface facing the left side of the car headrest, the m speakers are disposed in the left extension, and the outer surface of the left extension is provided with a plurality of sound-transmitting holes corresponding to the m speakers.
[0024] In one embodiment, the right extension has an outer surface facing the right side of the car headrest, the q speakers are disposed within the right extension, and the outer surface of the right extension has a plurality of sound-transmitting holes corresponding to the q speakers.
[0025] In one embodiment, the speakers of the first speaker array face to the left, the speakers of the second speaker array face to the right, the speakers of the third speaker array face to the left, and the speakers of the fourth speaker array face to the right.
[0026] A second aspect of this disclosure provides a car audio system including a plurality of car headrests, wherein a first car headrest is configured to be installed in the driver's side area of the car, and a second car headrest is configured to be installed in the passenger side area of the car.
[0027] In one embodiment, the fourth speaker array of the first car headrest and the first speaker array of the second car headrest are aligned with each other; or, the first speaker array of the first car headrest and the fourth speaker array of the second car headrest are aligned with each other.
[0028] In one embodiment, the first car headrest and the second car headrest are arranged side by side.
[0029] A third aspect of this disclosure provides a car privacy calling system, wherein the interior of the car is divided into multiple privacy zones, and the car privacy calling system includes:
[0030] The first car headrest is located in the first privacy area; and
[0031] The second car headrest is located in the second privacy area;
[0032] The first car headrest and the second car headrest are arranged side by side, and the first car headrest and the second car headrest respectively include the car headrests as described above.
[0033] The advantages of adopting the above solution in this disclosure are as follows:
[0034] The car headrest disclosed herein plays target sound to a target area (e.g., the driver's ears) through a second speaker array and a third speaker array, and plays canceling sound outside the target area through a first speaker array and a fourth speaker array to cancel sound transmitted from other areas, thereby reducing the sound transmitted to the target area from other areas (e.g., adjacent seats), thereby reducing the mutual influence of sound between different seating areas in the car. Attached Figure Description
[0035] To more clearly illustrate the technical solutions of this disclosure, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0036] Figure 1 is a schematic diagram of the distribution of a car audio system according to an embodiment of the present disclosure.
[0037] Figure 2 is a perspective view of a first type of car headrest according to an embodiment of the present disclosure.
[0038] Figure 3 is a top view of a first type of car headrest according to an embodiment of the present disclosure.
[0039] Figure 4 is a front view of a first type of car headrest according to an embodiment of the present disclosure.
[0040] Figure 5 is a perspective view of a second type of car headrest according to an embodiment of the present disclosure.
[0041] Figure 6 is a top view of a second type of car headrest according to an embodiment of the present disclosure.
[0042] Figure 7 is a front view of a second type of car headrest according to an embodiment of the present disclosure.
[0043] Figure 8 is a structural diagram of a loudspeaker according to an embodiment of the present disclosure.
[0044] Figure 9 is a sound energy ratio curve of a first type of car headrest according to an embodiment of the present disclosure.
[0045] In the above attached figures,
[0046] 1 - Car headrest; 10 - Main body; 101 - Left extension; 102 - Right extension; 110 - Speaker; 1101 - Diaphragm;
[0047] 111 - First loudspeaker array; 112 - Second loudspeaker array; 113 - Third loudspeaker array; 114 - Fourth loudspeaker array. Detailed Implementation
[0048] The preferred embodiments of this disclosure will now be described in detail with reference to the accompanying drawings, so that the advantages and features of this disclosure can be more easily understood by those skilled in the art. It should be noted that the description of these embodiments is for the purpose of aiding understanding of this disclosure, but does not constitute a limitation thereof. Furthermore, the technical features involved in the various embodiments of this disclosure described below can be combined with each other as long as they do not conflict with each other.
[0049] This embodiment provides a car headrest and a car audio system including multiple car headrests, used to create one or more private areas in a car, reduce sound leakage from the target private area to other areas, and reduce the mutual influence of sound between different seating areas in the car.
[0050] Referring to Figure 1, the car audio system includes multiple headrests 1 with built-in speaker arrays. Specifically, the car cabin is divided into multiple areas, including at least a driver's area and a front passenger area, and may also include multiple passenger areas in the rear. Each area has one headrest 1, which is specifically located at the top of the backrest of the car seat. The first headrest 1 is configured to be installed in the driver's area, the second headrest 1 is configured to be installed in the front passenger area, and each rear passenger area also has one headrest 1.
[0051] [Correction based on Rule 91, 22.04.2025] Referring to Figures 2 to 8, each car headrest 1 includes a main body 10, which has a left extension 101 and a right extension 102 protruding forward relative to its central portion. The left extension 101 and the right extension 102 are spaced apart from each other and are located on the left and right sides of the main body 10, respectively. A recessed portion (space) is formed between the left extension 101 and the right extension 102 to accommodate a person's head. When a person sits on the car seat, both ears are located at position P adjacent to the left extension 101 and the right extension 102 of the headrest main body 10.
[0052] The car headrest 1 also includes a first speaker array 111 and a second speaker array 112 disposed on the left extension 101 of the main body 10. The first speaker array 111 includes m speakers 110, and the second speaker array 112 includes n speakers 110. m and n are both positive integers greater than 1. In one example, m and n are equal, and each speaker 110 of the first speaker array 111 and one speaker 110 of the second speaker array 112 correspond to each other and are equal, as shown in Figures 2 to 4. In another example, m is less than n, and each speaker 110 of the first speaker array 111 and one speaker 110 of the second speaker array 112 correspond to each other and are equal, as shown in Figures 5 to 7.
[0053] The car headrest 1 also includes a third speaker array 113 and a fourth speaker array 114 disposed on the right extension 102 of the main body 10. The third speaker array 113 includes p speakers 110, and the fourth speaker array 114 includes q speakers 110. p and q are both positive integers greater than 1. In one example, p and q are equal, and each speaker 110 of the third speaker array 113 and one speaker 110 of the fourth speaker array 114 correspond to each other and are equal, as shown in Figures 2 to 4. In another example, q is less than p, and each speaker 110 of the fourth speaker array 114 and one speaker 110 of the third speaker array 113 correspond to each other and are equal, as shown in Figures 5 to 7.
[0054] The first speaker array 111, the second speaker array 112, the third speaker array 113, and the fourth speaker array 114 are arranged sequentially from left to right. The front faces of the speakers 110 of the second speaker array 112 and the third speaker array 113 face each other and have space corresponding to a person's head. The front faces of the speakers 110 of the first speaker array 111 face the outside of the car headrest 1, and the front faces of the speakers 110 of the fourth speaker array 114 face the outside of the car headrest 1. The vibration axes of the speakers 110 of the first speaker array 111 and the second speaker array 112 are parallel to each other, but their speakers 110 face opposite directions. The vibration axes of the speakers 110 of the third speaker array 113 and the fourth speaker array 114 are parallel to each other, but their speakers 110 face opposite directions.
[0055] The meanings of the aforementioned terms related to loudspeaker 110 will be explained in detail below with reference to Figure 8. As shown in Figure 8, loudspeaker 110 is specifically a moving-coil loudspeaker 110, which includes a vibration system and a drive system that drives the vibration system to produce sound. The vibration system and the drive system are housed in a bracket. The vibration system mainly includes a diaphragm 1101 and a voice coil connected to the diaphragm 1101. After the voice coil receives an audio electrical signal, it generates an electromagnetic induction phenomenon with the magnetic circuit of the drive system, thereby enabling it to reciprocate along the center line of the voice coil, thereby driving the diaphragm 1101 to reciprocate and produce sound. In this text, the "vibration axis of loudspeaker 110" refers to the direction of the reciprocating vibration of the diaphragm 1101 and the voice coil, specifically the center line of the voice coil; the "orientation" of loudspeaker 110 specifically refers to the direction facing the front of the diaphragm 1101 and the direction of sound radiation. The diaphragm 1101 has a front and a back, with the front being the surface facing the outside of loudspeaker 110.
[0056] The speakers 110 of the first speaker array 111 face to the left, and the speakers 110 of the second speaker array 112 face to the right. The speakers 110 of the third speaker array 113 face to the left, and the speakers 110 of the fourth speaker array 114 face to the right. The speaker arrays 110 of the multiple headrests 1 on the same row of seats are aligned with each other, and the multiple headrests 1 on the same row of seats are arranged side-by-side. Specifically, the fourth speaker array 114 of the first headrest (in the driver's area) and the first speaker array 111 of the second headrest (in the passenger's area) are aligned with each other. In another embodiment, the first speaker array 111 of the first headrest (in the driver's area) and the fourth speaker array 114 of the second headrest (in the passenger's area) are aligned with each other.
[0057] Specifically, the left extension 101 and the right extension 102 each have an inner surface, which are arranged opposite to each other. The n speakers of the second speaker array 112 are disposed within the left extension 101, and the inner surface of the left extension 101 has multiple sound-transmitting holes corresponding to the n speakers. The p speakers of the third speaker 113 are disposed within the right extension 102, and the inner surface of the right extension 102 has multiple sound-transmitting holes corresponding to the p speakers. The left extension 101 has an outer surface facing the left side of the car headrest, and m speakers are disposed within the left extension, with multiple sound-transmitting holes corresponding to the m speakers on the outer surface. The right extension 102 has an outer surface facing the right side of the car headrest, and q speakers are disposed within the right extension 102, with multiple sound-transmitting holes corresponding to the q speakers on the outer surface. Specifically, the left extension 101 and the right extension 102 each include a rigid frame and a cloth cover covering the outside of the frame. The aforementioned speakers are mounted on the frame or in the mounting holes opened on the frame. The aforementioned sound transmission holes are opened on the cloth cover and face the front of the speaker diaphragm and are positioned directly opposite each other so that sound can be radiated.
[0058] In this embodiment, m speakers 110 are arranged sequentially in the vertical direction, n speakers 110 are arranged sequentially in the vertical direction, p speakers 110 are arranged sequentially in the vertical direction, and q speakers 110 are arranged sequentially in the vertical direction. In one embodiment, 2≤m≤10, 3≤n≤10, 3≤p≤10, and 2≤q≤10. Further, m is between 2 and 6, n is between 3 and 6, p is between 3 and 6, and q is between 2 and 6.
[0059] This embodiment also provides a car privacy call system. Similar to Figure 1, the car's interior is divided into multiple privacy zones, including a driver's area, a front passenger area, and several rear passenger areas. The car privacy call system includes: a first car headrest located in the first privacy zone; and a second car headrest located in the second privacy zone. The first and second car headrests are arranged side-by-side, and each includes the type of headrest shown in Figures 2 to 7. If a person in the first privacy zone uses the first car headrest in that zone to make a remote call, the sound transmitted through the first car headrest to the first privacy zone will not be heard by a person in the second privacy zone; conversely, the same applies, thus achieving privacy call functionality.
[0060] Performance testing:
[0061] The goal is to make the driver's area a private area. A test point is set up in the passenger's area, and the sound of the corresponding passenger's ears P is collected by a microphone. During the test, the sound source (which can be played through other speakers 110, or through the second speaker array 112 and the third speaker array 113 of the car headrest 1 in this area) is located in the driver's area, and no sound source is set up in the passenger's area. The sound collected is the sound that is transmitted from the driver's area to the passenger's area.
[0062] With all four speaker arrays (111, 112, 113, and 114) of the headrest 1 in the driver's seat area operating, sound levels are collected at point P in the passenger seat area before and after each speaker array (110) of the headrest 1 in the driver's seat area is activated. The difference between these two measurements yields the sound energy ratio, as shown by the solid line in Figure 9. Sound Energy Ratio = (Sound decibels collected in the passenger seat area before each speaker array (110) of the headrest 1 is activated) - (Sound decibels collected in the passenger seat area after each speaker array (110) of the headrest 1 is activated).
[0063] In a mode where only the second speaker array 112 and the third speaker array 113 of the car headrest 1 in the driver's area are working, while the first speaker array 111 and the fourth speaker array 114 are not working, the sound before and after each speaker array 110 of the car headrest 1 in the driver's area is collected at point P in the passenger area, and the sound energy ratio is obtained by subtracting them. The sound energy ratio curve is shown as the dashed line in Figure 9.
[0064] As can be seen from Figure 9, when both the inner and outer speaker arrays 110 of the car headrest 1 are working, the sound leakage from the target privacy area to other areas can be significantly reduced, and the sound interference between different areas of the car can be reduced.
[0065] In this embodiment, the car headrest 1 plays target sound to a target area (e.g., the driver's ears) through a second speaker array 112 and a third speaker array 113 to achieve better sound effects. It also plays canceling sound outside the target area through a first speaker array 111 and a fourth speaker array 114 (the specific principle can be found in patent CN2019101282309) to cancel sound from other areas, reducing the sound propagating to the target area from other areas (e.g., neighboring seats), thereby reducing the mutual influence of sound between different seating areas in the car. While providing good sound effects, it also offers good privacy. The arrayed speakers can achieve a large sound field coverage and a wide controllable area.
[0066] Features of the embodiments of this disclosure are set forth in the following terms:
[0067] Clause 1. A car headrest, comprising a main body, characterized in that the car headrest further comprises a first speaker array and a second speaker array disposed on the left side of the main body, the first speaker array comprising m speakers and the second speaker array comprising n speakers;
[0068] The car headrest also includes a third speaker array and a fourth speaker array located on the right side of the main body. The third speaker array includes p speakers, and the fourth speaker array includes q speakers.
[0069] m, n, p, and q are all positive integers greater than 1;
[0070] The first speaker array, the second speaker array, the third speaker array, and the fourth speaker array are arranged sequentially from left to right. The front of the speakers in the second speaker array and the front of the speakers in the third speaker array face each other and have space corresponding to a person's head. The front of the speakers in the first speaker array faces the outside of the car headrest, and the front of the speakers in the fourth speaker array faces the outside of the car headrest.
[0071] Clause 2. The car headrest according to Clause 1, wherein the m speakers are arranged sequentially in the vertical direction, the n speakers are arranged sequentially in the vertical direction, the p speakers are arranged sequentially in the vertical direction, and the q speakers are arranged sequentially in the vertical direction.
[0072] Clause 3. The car headrest according to Clause 1, wherein the vibration axes of the speakers of the first speaker array and the second speaker array are parallel to each other and the speakers of the two arrays are facing opposite directions; the vibration axes of the speakers of the third speaker array and the fourth speaker array are parallel to each other and the speakers of the two arrays are facing opposite directions.
[0073] Clause 4. The automotive headrest as described in Clause 1, wherein m and n are equal, and each speaker of the first speaker array and one speaker of the second speaker array correspond to each other and are equal.
[0074] Clause 5. The automotive headrest as described in Clause 1 or 4, wherein p and q are equal, and each speaker of the third speaker array and one speaker of the fourth speaker array correspond to each other and are equal.
[0075] Clause 6. The car headrest as described in Clause 1, wherein m is less than n and p is greater than q.
[0076] Clause 7. The car headrest as described in Clause 1, wherein 2≤m≤10, 3≤n≤10, 3≤p≤10, and 2≤q≤10.
[0077] Clause 8. The automotive headrest according to Clause 1, wherein the left and right portions of the body protrude forward relative to the middle portion of the body.
[0078] Clause 9. The car headrest as described in Clause 1 or 8, wherein the speakers of the first speaker array face to the left, the speakers of the second speaker array face to the right, the speakers of the third speaker array face to the left, and the speakers of the fourth speaker array face to the right.
[0079] Clause 10. A car audio system comprising a plurality of car headrests as described in the preceding clause, wherein a first car headrest is configured to be installed in the driver's side area of the car, and a second car headrest is configured to be installed in the passenger side area of the car.
[0080] As indicated in this specification and claims, the terms "comprising" and "including" only indicate the inclusion of explicitly identified steps and elements, and these steps and elements do not constitute an exclusive list, and the method or apparatus may also include other steps or elements.
[0081] Those skilled in the art will understand that, unless otherwise stated, the singular forms “a,” “the,” and “the” used herein may also include the plural forms. It will be further understood that “multiple” in this disclosure refers to two or more, and other quantifiers are similarly understood.
[0082] It is further understood that the terms "first," "second," etc., are used to describe various types of information, but this information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another, and do not indicate a specific order or degree of importance. In fact, the expressions "first," "second," etc., are completely interchangeable. For example, without departing from the scope of this disclosure, first information can also be referred to as second information, and similarly, second information can also be referred to as first information.
[0083] In this disclosure, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.
[0084] The above embodiments are only for illustrating the technical concept and features of this disclosure, and are preferred embodiments. Their purpose is to enable those skilled in the art to understand the content of this disclosure and implement it accordingly, and they cannot be used to limit the scope of protection of this disclosure.
Claims
1. A car headrest, comprising: The main body has a left extension and a right extension that are spaced apart from each other; A first loudspeaker array is disposed in the left extension, and the first loudspeaker array includes m loudspeakers; A second loudspeaker array is provided in the left extension, and the second loudspeaker array includes n loudspeakers; A third loudspeaker array is provided in the right extension, and the third loudspeaker array includes p loudspeakers; and A fourth speaker array is provided in the right extension, and the fourth speaker array includes q speakers; Where m, n, p, and q are all positive integers greater than 1; The first speaker array, the second speaker array, the third speaker array, and the fourth speaker array are arranged sequentially from left to right. The front of the speakers of the second speaker array and the front of the speakers of the third speaker array face each other and form a space between them corresponding to a person's head. The front of the speakers of the first speaker array faces the outside of the car headrest, and the front of the speakers of the fourth speaker array faces the outside of the car headrest.
2. The car headrest according to claim 1, characterized in that, The m loudspeakers are arranged sequentially in the vertical direction, the n loudspeakers are arranged sequentially in the vertical direction, the p loudspeakers are arranged sequentially in the vertical direction, and the q loudspeakers are arranged sequentially in the vertical direction.
3. The automotive headrest according to any of the preceding claims, characterized in that, The vibration axes of the speakers in the first speaker array and the second speaker array are parallel to each other, and their speakers face opposite directions; the vibration axes of the speakers in the third speaker array and the fourth speaker array are parallel to each other, and their speakers face opposite directions.
4. The automotive headrest according to any of the preceding claims, characterized in that, m and n are equal, and each speaker in the first speaker array corresponds to and is equal to one speaker in the second speaker array.
5. The automotive headrest according to any of the preceding claims, characterized in that, p and q are equal, and each speaker in the third speaker array corresponds to and is equal to one speaker in the fourth speaker array.
6. The automobile headrest according to any one of claims 1 to 3, characterized in that, m is less than n, and p is greater than q.
7. The automotive headrest according to any of the preceding claims, characterized in that, 2≤m≤10, 3≤n≤10, 3≤p≤10, 2≤q≤10.
8. The automotive headrest according to any of the preceding claims, characterized in that, The main body has a middle section, the left extension is located on the left side of the main body, and the right extension is located on the right side of the main body. The left extension and the right extension of the main body protrude forward relative to the middle section of the main body, thereby forming a recessed part suitable for accommodating a person's head.
9. The automotive headrest according to any of the preceding claims, characterized in that, The left extension and the right extension each have an inner surface, and the inner surfaces of the two are arranged opposite to each other. The n speakers of the second speaker array are arranged in the left extension, and the inner surface of the left extension is provided with a plurality of sound transmission holes corresponding to the n speakers. The third loudspeaker has p loudspeakers located inside the right extension, and the inner surface of the right extension has a plurality of sound-transmitting holes corresponding to the p loudspeakers.
10. The car headrest according to claim 9, characterized in that, The left extension has an outer surface facing the left side of the car headrest, the m speakers are disposed in the left extension, and the outer surface of the left extension is provided with a plurality of sound transmission holes corresponding to the m speakers.
11. The car headrest according to claim 9 or 10, characterized in that, The right extension has an outer surface facing the right side of the car headrest, the q speakers are disposed in the right extension, and the outer surface of the right extension is provided with a plurality of sound transmission holes corresponding to the q speakers.
12. The automotive headrest according to any of the preceding claims, characterized in that, The speakers of the first speaker array face to the left, the speakers of the second speaker array face to the right, the speakers of the third speaker array face to the left, and the speakers of the fourth speaker array face to the right.
13. A car audio system comprising a plurality of car headrests as described in any one of claims 1 to 12, wherein a first car headrest is configured to be installed in the driver's side area of the car, and a second car headrest is configured to be installed in the passenger side area of the car.
14. The car audio system according to claim 13, characterized in that, The fourth speaker array of the first car headrest and the first speaker array of the second car headrest are aligned with each other; or, the first speaker array of the first car headrest and the fourth speaker array of the second car headrest are aligned with each other.
15. A car privacy calling system, wherein the interior of the car is divided into multiple privacy zones, the car privacy calling system comprising: The first car headrest is located in the first privacy area; and The second car headrest is located in the second privacy area; The first car headrest and the second car headrest are arranged side by side, and the first car headrest and the second car headrest are respectively the car headrests as described in any one of claims 1 to 12.