Microphone and smart wearable device

Abstract

The application provides a microphone and a smart wearable device, which comprise a printed circuit board and a shell arranged on the printed circuit board, and the printed circuit board and the shell cooperate to form a containing cavity; a partition is arranged in the containing cavity, and the partition divides the containing cavity into a first cavity and a second cavity; a MEMS chip and an ASIC chip connected in signal are arranged in the first cavity; an acoustic hole and a communication hole are formed on the printed circuit board, the acoustic hole is communicated with the first cavity, the communication hole is communicated with the second cavity, the communication hole is used for facing the sound inlet direction, and the acoustic hole is used for acoustically connecting the position of the communication hole. The microphone has the advantages that wind noise can be reduced.

Description

Technical Field

[0001] This invention relates to the field of transducer technology, and more particularly to a microphone and a smart wearable device. Background Technology

[0002] Existing smart wearable devices with call and radio functions have microphones installed inside the casing. The microphone's sound hole is usually positioned directly opposite the sound pickup hole in the casing. In this case, when wind blows, it directly enters the microphone's sound hole, generating significant noise, which degrades the sound and call quality, resulting in a poor user experience.

[0003] Therefore, it is necessary to provide a new microphone and smart wearable device to solve or at least alleviate the aforementioned technical defects. Summary of the Invention

[0004] The main objective of this invention is to provide a microphone and a smart wearable device that aims to solve the technical problem of high microphone noise in the prior art.

[0005] To achieve the above objectives, according to one aspect of the present invention, a microphone is provided for use in a smart wearable device, comprising a printed circuit board and a housing covering the printed circuit board, wherein the printed circuit board and the housing cooperate to form a receiving cavity; a partition is provided within the receiving cavity, the partition dividing the receiving cavity into a first cavity and a second cavity, wherein a MEMS chip and an ASIC chip connected for signal connection are disposed within the first cavity, and a sound hole and a connecting hole are formed on the printed circuit board, the sound hole communicating with the first cavity, the connecting hole communicating with the second cavity, the connecting hole being directed towards the sound intake direction, and the sound hole being acoustically connected to the location of the connecting hole.

[0006] According to another aspect of the present invention, the present invention also provides a smart wearable device, the smart wearable device including the microphone described above.

[0007] In some embodiments, the smart wearable device further includes a housing, the housing including a mounting plate, an air inlet channel and a microphone hole, the printed circuit board being mounted on the mounting plate, the mounting plate having a first through hole and a second through hole, the first through hole communicating with the microphone hole, the second through hole communicating with the connecting hole, the air inlet side of the air inlet channel communicating with the microphone hole, and the air outlet side of the air inlet channel communicating with the first through hole and the second through hole respectively.

[0008] In some embodiments, the pickup hole faces the second through hole, and the pickup hole is offset from the first through hole.

[0009] In some embodiments, the air intake channel includes a first channel and a second channel that are connected at an angle and communicate with each other, the first channel being connected to the first through hole; the two ends of the second channel are respectively connected to the pickup hole and the second through hole.

[0010] In some embodiments, the first channel and the second channel are arranged perpendicularly, the first channel extends along the length direction of the mounting plate, and the second channel is arranged perpendicular to the mounting plate.

[0011] In some embodiments, on a cross-section perpendicular to the air inlet direction, let the cross-sectional area of ​​the first channel be S1 and the cross-sectional area of ​​the second channel be S2, then S1 <S2。

[0012] In some embodiments, a baffle is provided in the second channel, and a gap is formed between the baffle and the side wall of the second channel to allow air to flow through.

[0013] In some embodiments, the first cavity and the second cavity are arranged side by side along the length of the mounting plate.

[0014] In some embodiments, the smart wearable device includes a mobile phone, headphones, or a virtual reality device.

[0015] The above solution, applied to smart wearable devices, includes a printed circuit board (PCB) and a housing covering the PCB. The PCB and housing cooperate to form a receiving cavity. A separator is provided within the receiving cavity, dividing it into a first cavity and a second cavity. A MEMS chip and an ASIC chip for signal connection are housed within the first cavity. A sound hole and a connecting hole are formed on the PCB. The sound hole communicates with the first cavity, and the connecting hole communicates with the second cavity. The connecting hole faces the direction of sound intake, and the sound hole acoustically connects to the location of the connecting hole. In this embodiment, a separate second cavity is partitioned within the microphone's receiving cavity. The microphone's MEMS chip and ASIC chip, among other components, are housed within the first cavity. The first and second cavities are separated from each other and arranged side-by-side relative to the PCB. Simultaneously, the PCB has a sound hole and a connecting hole. The sound hole communicates with the first cavity and faces the MEMS chip, functioning as a traditional MEMS microphone. The connecting hole communicates with the second cavity. Thus, when the microphone is mounted on the device, which can be an electronic device such as a smart wearable device, a mobile phone, headphones, or a virtual reality device, etc., the mounting plate of the device has a first through hole and a second through hole. The first through hole connects to the sound hole to facilitate normal microphone pickup. The second through hole connects to the connecting hole, so that at least part of the air entering the device is consumed by the second cavity. The second cavity structure of this microphone has higher attenuation for low-frequency incident waves and lower attenuation for high-frequency incident waves. The noise we want to eliminate is generally in the low-frequency band, such as traffic noise, elevator noise, noise from central air conditioning, and transformers. Therefore, this invention has the advantage of reducing wind noise, and it reduces wind noise by selectively eliminating low-frequency noise, minimizing the impact on the microphone's normal pickup function. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the microphone structure according to an embodiment of the present invention;

[0018] Figure 2 This is a schematic diagram of the structure of a smart wearable device according to an embodiment of the present invention;

[0019] Figure 3 This is a schematic diagram of the mounting plate and microphone of the smart wearable device according to an embodiment of the present invention;

[0020] Figure 4 This is a schematic diagram of the airflow structure of the smart wearable device according to an embodiment of the present invention;

[0021] Figure 5 This diagram illustrates the relationship between sound frequency and microphone noise reduction.

[0022] Figure 6 This is another structural schematic diagram of the smart wearable device according to an embodiment of the present invention.

[0023] Explanation of icon numbers:

[0024] 100. Smart wearable devices;

[0025] 10. Microphone; 20. Mounting plate; 30. First through hole; 40. Second through hole; 50. Air inlet channel; 51. First channel; 52. Second channel; 60. Housing; 70. Sound pickup hole; 80. Baffle plate;

[0026] 1. Printed circuit board; 2. Housing; 3. Separator; 4. First cavity; 5. Second cavity; 6. MEMS chip; 7. ASIC chip; 8. Sound hole; 9. Connecting hole.

[0027] The realization of the objective, functional characteristics and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] It should be noted that all directional indicators (such as up, down, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0030] Furthermore, in this invention, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature.

[0031] Furthermore, the technical solutions of the various embodiments of the present invention can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

[0032] Reference Figure 1 According to one aspect of the present invention, a microphone 10 is provided for use in a smart wearable device 100. The smart wearable device 100 further includes a housing 60, which includes a mounting plate 20, an air inlet channel 50, and a pickup hole 70. The air outlet side of the air inlet channel 50 is connected to a first through hole 30 and a second through hole 40, respectively. The microphone 10 includes a printed circuit board 1 and a housing 2 covering the printed circuit board 1. The printed circuit board 1 and the housing 2 cooperate to form a receiving cavity. A partition 3 is provided inside the receiving cavity, which divides the receiving cavity into a first cavity 4 and a second cavity 5. A MEMS chip 6 and an ASIC chip 7 for signal connection are provided inside the first cavity 4. A sound hole 8 and a connecting hole 9 are formed on the printed circuit board 1. The sound hole 8 is connected to the first cavity 4, and the connecting hole 9 is connected to the second cavity 5. The connecting hole 9 is used to face the sound inlet direction, and the sound hole 8 is used to acoustically connect to the position of the connecting hole 9. The side of the printed circuit board 1 facing away from the housing 2 is used to mount it on the mounting plate 20. The sound hole 8 connects the first through hole 30 and the first cavity 4, and the connecting hole 9 connects the second through hole 40 and the second cavity 5.

[0033] Compared to a conventional microphone 10, this embodiment separates a second cavity 5 within the receiving cavity of the microphone 10. The MEMS chip 6 and ASIC chip 7 of the microphone 10 are housed within the first cavity 4. The first cavity 4 and the second cavity 5 are separated from each other and arranged side-by-side relative to the printed circuit board 1. Simultaneously, the printed circuit board 1 has a sound hole 8 and a connecting hole 9. The sound hole 8 connects to the first cavity 4 and faces the MEMS chip 6, functioning as a traditional MEMS microphone. The connecting hole 9 faces the sound inlet direction, while the sound hole 8 does not. This allows external sound signals to enter the connecting hole 9 more easily, requiring a change in airflow direction to enter the sound hole 8. Sound entering the second cavity 5 through the connecting hole 9 provides noise reduction. The connecting hole 9 connects to the second cavity 5, thus providing noise reduction. The specific principle is as follows: Assuming the acoustic capacitance of the second cavity 5 is C, and the acoustic mass of the connecting hole 9 of the second cavity 5 is M, then the acoustic impedance of the second cavity 5 is... ,in Let π be the frequency of the sound, and π be the constant of pi. Since the connecting hole 9 is positioned directly opposite the direction of sound entry, by setting appropriate acoustic capacitance values ​​C and M, when wind enters the second cavity 5, the resonant frequency of the second cavity 5 is the same as or close to that of the incident wave, thus achieving a filtering effect. Based on the above description, it can be known that the energy dissipation of the second cavity 5 for sound is as follows: Figure 5As shown in the figure. The horizontal axis represents the frequency of the sound, in Hz, and the vertical axis represents the noise reduction, in decibels (dB). Figure 5 It can be seen that the second cavity 5 structure of the microphone 10 has relatively high noise loss for low-frequency incident waves (sound is a wave) and relatively low noise loss for high-frequency incident waves. The noise we need to eliminate is generally in the low-frequency band, such as traffic noise, elevator noise, noise from central air conditioning, and transformers. Therefore, this embodiment has the advantage of reducing wind noise, and it reduces wind noise by selectively eliminating low-frequency noise, minimizing the impact on the normal sound pickup function of the microphone 10, i.e., it does not affect our acquisition of the desired sound frequencies.

[0034] It should be noted that the microphone 10 can be installed on the entire device and work in conjunction with the device's structure to achieve noise reduction. This device can be an electronic device such as a smart wearable device 100, specifically a mobile phone, headphones, or virtual reality device. When the microphone 10 is installed on the wearable device 100, the smart wearable device 100 also includes a housing 60. The housing 60 includes a mounting plate 20, an air inlet channel 50, and a pickup hole 70. The air outlet side of the air inlet channel 50 is connected to the first through hole 30 and the second through hole 40, respectively. The side of the printed circuit board 1 facing away from the housing 2 is used to mount it on the mounting plate 20. The sound hole 8 connects the first through hole 30 and the first cavity 4, and the connecting hole 9 connects the second through hole 40 and the second cavity 5. The connecting hole 9 is positioned directly opposite the sound inlet direction of the air inlet channel 50. The connection between the first through hole 30 and the sound hole 8 allows the microphone 10 to pick up sound normally. The connection between the second through hole 40 and the connecting hole 9 ensures that at least part of the air entering the device is consumed by the second cavity 5 of the microphone 10. The acoustic hole 8 is used for acoustic connection. The position of the connecting hole 9 means that the acoustic hole 8 and the connecting hole 9 can be connected through the air inlet channel 59.

[0035] Reference Figures 2-4 According to another aspect of the present invention, the present invention also provides a smart wearable device 100, which includes the microphone 10 described above. The smart wearable device 100 can be a mobile phone, headphones, or a virtual reality device, etc. Since the smart wearable device includes all the technical solutions of all embodiments of the microphone 10 described above, it possesses at least all the beneficial effects brought by all the above technical solutions, which will not be elaborated upon here.

[0036] Reference Figure 2 and Figure 3In some embodiments, the smart wearable device 100 further includes a housing 60, which includes a mounting plate 20, an air inlet channel 50, and a microphone 70. A printed circuit board 1 is mounted on the mounting plate 20. The mounting plate 20 has a first through hole 30 and a second through hole 40. The first through hole 30 communicates with a sound hole 8, and the second through hole 40 communicates with a connecting hole 9. The air inlet side of the air inlet channel 50 communicates with the microphone 70, and the air outlet side of the air inlet channel 50 communicates with both the first through hole 30 and the second through hole 40. Specifically, the first cavity 4 and the second cavity 5 are arranged side-by-side along the length of the mounting plate 20. External wind or sound enters the interior of the smart wearable device 100 through the microphone 70, specifically into the air inlet channel 50. The microphone 10 is mounted on the side of the mounting plate 20 opposite to the air inlet channel 50. Unlike existing technologies, the circuit board corresponding to the microphone 10 has two sound holes, and the mounting plate 20 also has two through holes, namely a first through hole 30 and a second through hole 40. The first through hole 30 connects to the sound hole 8 to perform the normal sound pickup function of the microphone 10. The added second through hole 40 connects to the connecting hole 9 so that the air coming in from the air inlet channel 50 can enter the second cavity 5 through the second through hole 40 and the connecting hole 9, so that the energy of the wind can be consumed by the second cavity 5, especially the low-frequency environmental noise, thereby reducing wind noise. The specific principle is as described above: the acoustic impedance of the second cavity 5 is... ,in Let be the frequency of the sound, and π be the constant pi. By setting appropriate acoustic capacitance values ​​C and M, when wind enters the second cavity 5, the resonant frequency of the second cavity 5 is consistent with or close to that of the incident wave, thus achieving a filtering effect. Figure 2 It can be seen that the second cavity 5 structure of the microphone 10 has higher noise loss for low-frequency incident waves and lower noise loss for high-frequency incident waves. The noise we need to eliminate is generally in the low-frequency band, such as traffic noise, elevator noise, noise from central air conditioning, and transformers. Therefore, this embodiment has the advantage of reducing wind noise by selectively eliminating low-frequency noise, and also reduces the impact on the normal sound pickup function of the microphone 10.

[0037] Reference Figures 2-4 In some embodiments, the pickup hole 70 faces the second through hole 40, and the pickup hole 70 is offset from the first through hole 30. To ensure that as much sound as possible entering from the pickup hole 70 is filtered by the second cavity 5, the pickup hole 70 can be positioned facing the second through hole 40 to facilitate airflow into the second cavity 5. Simultaneously, offsetting the pickup hole 70 from the first through hole 30 increases the airflow path, reduces airflow volume and speed, allowing more air to enter the second cavity 5 while also reducing wind noise. (Refer to...) Figure 4, the arrow A indicates the direction of the wind. The number of arrows entering the second channel 52 is relatively reduced compared to the number of arrows entering the first channel 51, indicating that the amount of wind entering the second channel 52 is also decreased.

[0038] Referring to Figure 2 and Figure 4 , in some embodiments, the air inlet channel 50 includes a first channel 51 and a second channel 52 that are angled and connected and communicate with each other. The first channel 51 communicates with the first through hole 30, and both ends of the second channel 52 communicate with the sound pickup hole 70 and the second through hole 40 respectively. By setting the angled-connected first channel 51 and second channel 52, the wind entering from the sound pickup hole 70 directly enters the second cavity 5 through the first channel 51, enabling as much wind as possible to pass through the filtering effect of the second cavity 5, reducing low-frequency wind noise, and playing a role in reducing wind noise. At the same time, the wind that needs to enter the first cavity 4 needs to turn between the first channel 51 and the second channel 52, and both the amount of wind and the wind speed will be reduced, which can also play a role in reducing wind noise. In some specific embodiments, the first channel 51 and the second channel 52 are perpendicularly arranged, and the central axis of the first channel 51 and the central axis of the second channel 52 are perpendicular. The first channel 51 extends along the length direction of the mounting plate 20, and the second channel 52 is perpendicular to the mounting plate 20.

[0039] Referring to Figure 2 and Figure 4 , in some embodiments, in a cross-section perpendicular to the air inlet direction, the cross-sectional area of the first channel 51 is denoted as S1, and the cross-sectional area of the second channel 52 is denoted as S2, then S1 < S2. Designing the cross-sectional area of the first channel 51 to be smaller and the cross-sectional area of the second channel 52 to be larger, in this way, the resistance of the wind from the second channel 52 to the first channel 51 will increase, so more wind will enter the second cavity 5 from the second through hole 40 and the communication hole 9. In this way, both the amount of wind filtered by the second cavity 5 is increased, and more wind entering the microphone 10 passes through the filtering effect, which is beneficial to further reducing the sound noise.

[0040] Referring to Figure 6 , in some embodiments, a baffle 80 is provided in the second channel 52, and a gap for air to flow through is formed between the baffle 80 and the side wall of the second channel 52. The baffle 80 is mainly used to hinder the flow of wind in the second channel 52. The bottom end of the baffle 80 is installed on the side wall, and there is a gap between the top end of the baffle 80 and other positions of the side wall for air to pass through. By setting the baffle 80, both the wind speed entering the first cavity 4 can be reduced, and by increasing the flow resistance of the second channel 52, more wind enters the second cavity 5, and the second cavity 5 plays a role in reducing low-frequency noise.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application and are not intended to limit the patent scope of this invention. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that, under the technical concept of this invention, modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; or they can be directly / indirectly applied to other related technical fields. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A microphone, characterized in that, The device includes a printed circuit board and a housing covering the printed circuit board, the printed circuit board and the housing cooperate to form a receiving cavity; a partition is provided in the receiving cavity, the partition divides the receiving cavity into a first cavity and a second cavity, a MEMS chip and an ASIC chip with signal connection are provided in the first cavity, an acoustic hole and a connecting hole are formed on the printed circuit board, the acoustic hole communicates with the first cavity, the connecting hole communicates with the second cavity, the connecting hole is used to face the sound intake direction, and the acoustic hole is used to acoustically connect the position of the connecting hole.

2. A smart wearable device, characterized in that, The smart wearable device includes the microphone as described in claim 1.

3. The intelligent wearable device according to claim 2, characterized in that, The smart wearable device also includes a housing, which includes a mounting plate, an air inlet channel, and a microphone hole. The printed circuit board is mounted on the mounting plate, which has a first through hole and a second through hole. The first through hole communicates with the microphone hole, and the second through hole communicates with the connecting hole. The air inlet side of the air inlet channel communicates with the microphone hole, and the air outlet side of the air inlet channel communicates with the first through hole and the second through hole, respectively.

4. The smart wearable device according to claim 3, characterized in that, The pickup hole faces the second through hole, and the pickup hole is offset from the first through hole.

5. The smart wearable device according to claim 3, characterized in that, The air intake channel includes a first channel and a second channel that are connected at an angle and communicate with each other. The first channel is connected to the first through hole, and the two ends of the second channel are respectively connected to the pickup hole and the second through hole.

6. The smart wearable device according to claim 5, characterized in that, The first channel and the second channel are arranged perpendicularly, the first channel extends along the length of the mounting plate, and the second channel is arranged perpendicular to the mounting plate.

7. The smart wearable device according to claim 5, characterized in that, On a cross-section perpendicular to the air inlet direction, let the cross-sectional area of ​​the first channel be S1, and the cross-sectional area of ​​the second channel be S2, then S1 <S2。 8. The smart wearable device according to claim 5, characterized in that, A baffle is provided in the second channel, and a gap is formed between the baffle and the side wall of the second channel to allow air to flow through.

9. The smart wearable device according to any one of claims 3 to 8, characterized in that, The first cavity and the second cavity are arranged side by side along the length of the mounting plate.

10. The smart wearable device according to any one of claims 2 to 8, characterized in that, The smart wearable devices include mobile phones, headphones, or virtual reality devices.

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