A TWS headset with a shock-absorbing microphone and a noise reduction method

Abstract

The present invention discloses a TWS headset with a shock-absorbing microphone and a noise reduction method. The TWS headset of the present invention includes a PCBA circuit board and a speaker. The PCBA circuit board is provided with a shock-absorbing microphone and a noise reduction controller. The shock-absorbing microphone has a first sensor for picking up low-frequency vibration sound and a second sensor for picking up ambient noise. The first sensor is attached to the PCBA circuit board and enclosed by the PCBA circuit board, and the second sensor is exposed and not enclosed by the PCBA circuit board. The noise reduction controller is electrically connected to the shock-absorbing microphone and the speaker respectively. The shock-absorbing microphone converts the picked-up low-frequency vibration sound and ambient noise into a noise audio signal and then sends it to the noise reduction controller. The noise reduction controller generates an inverted noise audio signal based on the noise audio signal and sends it to the speaker for playback. The present invention achieves noise reduction by picking up low-frequency vibration sound and ambient noise through the shock-absorbing microphone. Its noise reduction value can be improved to 53-55dB, and the average depth of noise reduction value in the frequency range of 20-400Hz can reach 40dB.

Description

Technical Field

[0001] The present invention relates to the technical field of headphone noise reduction, and in particular to a TWS headphone with a shock-absorbing microphone and a noise reduction method. Background Art

[0002] Currently, TWS earbuds are popular among users due to their freedom from wires and easy storage. To improve their quality, more and more TWS earbuds are now equipped with noise reduction features. Noise reduction earbuds offer two types of noise reduction: passive noise reduction and active noise reduction (ANC). ANC noise reduction in a nutshell: The noise reduction microphone transmits ambient noise outside the earbuds to the noise reduction control system, which then generates an inverted sound wave and sends it to the speaker. The resulting sound is a combination of ambient noise and the inverted ambient noise. The two noises cancel each other out, resulting in a perceived reduction in noise that benefits the earbuds.

[0003] ANC noise reduction technology is mature. The noise reduction effect of mainstream noise reduction headphones on the market is -30 to -47dB. However, there are still some difficulties, such as POP sound (physical vibration sound), the bumpy sound when riding a bus over a speed bump, the vibration sound when riding a train, subway, high-speed rail, and the physical transmission of subway vibration and bumps. This type of physical vibration sound is usually low-frequency noise, and its frequency range is usually between 20 and 400Hz. The noise reduction microphones of existing ANC noise reduction headphones have difficulty picking up this low-frequency noise, resulting in consumers still being able to hear this low-frequency noise. Figure 1 , Figure 1 The signal below is the noise signal in the ANC off state in the prior art. Figure 1 The signal above is the noise signal in the ANC open state in the prior art. Figure 1 It can be seen that when ANC is turned on, the noise reduction is still not thorough enough, mainly because low-frequency noise is difficult to eliminate.

[0004] See Chinese patent document CN107172540A, which discloses a noise reduction circuit, filter circuit, and device for headphone microphone signals. The headphone microphone noise reduction circuit includes a low-frequency filter module, a mid-low-frequency filter module, and a high-frequency filter module. The low-frequency filter module filters noise in the low-frequency signal of the headphone microphone signal, the mid-low-frequency filter module filters noise in the mid-low-frequency signal of the headphone microphone signal, and the high-frequency filter module filters noise in the high-frequency signal of the headphone microphone signal. While CN107172540A can filter and reduce low-frequency noise through the low-frequency filter module, it does not address the problem of noise-canceling microphones having difficulty picking up low-frequency noise.

[0005] See Chinese patent document CN114390390A, which discloses a noise reduction method for headphones. The method comprises obtaining a correlation between sound signals collected by two microphones in the headphones, wherein the two microphones include a feedforward microphone and a call microphone; obtaining a first energy of the sound signal collected by the feedforward microphone; determining the spectral centroid of the sound spectrum based on the sound signal; performing wind noise detection on the headphones based on the correlation, the first energy, and the spectral centroid; and, in response to detecting the presence of wind noise, performing active noise reduction on the headphones. Thus, by comprehensively considering the effects of correlation, energy, and spectral centroid on noise detection, the introduction of the spectral centroid can improve the headphones' detection of low-frequency noise. However, CN114390390A does not address the problem of the feedforward microphone's difficulty in picking up low-frequency noise. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to address the deficiencies of the above-mentioned prior art and provide a TWS headset with a shock-absorbing microphone and a noise reduction method. A shock-absorbing microphone and a noise reduction controller are provided on the PCBA circuit board of the TWS headset. The shock-absorbing microphone has a first sensor for picking up low-frequency vibration sound and a second sensor for picking up ambient noise. The first sensor is attached to the PCBA circuit board and is enclosed by the PCBA circuit board, and the second sensor is exposed and not enclosed by the PCBA circuit board. The external low-frequency vibration sound is transmitted to the PCBA circuit board, which will cause the PCBA circuit board to resonate. The low-frequency vibration sound on the PCBA circuit board is picked up by the first sensor of the shock-absorbing microphone, and then the ambient noise is picked up by the second sensor. The low-frequency vibration sound and the ambient noise are converted into a noise audio signal and sent to the noise reduction controller. The noise reduction controller generates an inverted inverted noise audio signal according to the noise audio signal, and then sends it to the speaker. The speaker plays the inverted noise, and the inverted noise is superimposed and offset with the low-frequency vibration sound and the ambient noise to achieve noise reduction. The noise reduction value can be improved to -53~-55dB, 20~400Hz The average depth of noise reduction in the frequency range can reach -40dB.

[0007] To solve the above technical problems, the first technical solution of the present invention is: a TWS headset with a shock-absorbing microphone, including a PCBA circuit board and a speaker, the PCBA circuit board is provided with a shock-absorbing microphone and a noise reduction controller, the shock-absorbing microphone has a first sensor for picking up low-frequency vibration sound and a second sensor for picking up ambient noise, the first sensor is attached to the PCBA circuit board and is enclosed by the PCBA circuit board, and the second sensor is exposed and not enclosed by the PCBA circuit board; the noise reduction controller is electrically connected to the shock-absorbing microphone and the speaker respectively, the shock-absorbing microphone converts the picked-up low-frequency vibration sound and ambient noise into a noise audio signal and then sends it to the noise reduction controller, the noise reduction controller generates an inverted inverted noise audio signal according to the noise audio signal, and sends it to the speaker for play.

[0008] Preferably, the vibration reduction microphone is an FF feedforward noise reduction and vibration reduction microphone and / or a FB feedback noise reduction and vibration reduction microphone.

[0009] Preferably, the frequency range of the low-frequency vibration sound picked up by the first sensor of the shock-absorbing microphone is 20 to 400 Hz.

[0010] Preferably, the shock-absorbing microphone is welded on a PCBA circuit board. The PCBA circuit board is provided with a microphone hole, and the second sensor of the shock-absorbing microphone is placed in the microphone hole.

[0011] To solve the above technical problems, the second technical solution of the present invention is: the noise reduction method of the TWS headset with a shock-absorbing microphone comprises the following steps:

[0012] 1) The first sensor of the shock-absorbing microphone picks up low-frequency vibration sounds, while the second sensor of the shock-absorbing microphone picks up ambient noise;

[0013] 2) The vibration-reducing microphone converts the low-frequency vibration sound and ambient noise it picks up into a noise audio signal and sends it to the noise reduction controller;

[0014] 3) The noise reduction controller generates an inverted noise audio signal according to the noise audio signal;

[0015] 4) The noise reduction controller sends the anti-phase noise audio signal to the speaker, which plays the anti-phase noise. The anti-phase noise is superimposed and offset by the low-frequency vibration sound and ambient noise to achieve noise reduction.

[0016] Preferably, the noise reduction method includes a noise reduction method of an FF feedforward noise reduction and shock absorption microphone and / or a noise reduction method of an FB feedback noise reduction and shock absorption microphone.

[0017] Preferably, the noise reduction method of the FB feedback noise reduction and shock reduction microphone includes the following steps:

[0018] i. The first sensor of the FB rear-feedback noise-cancelling and shock-absorbing microphone picks up low-frequency vibration sounds, while the second sensor of the FB rear-feedback noise-cancelling and shock-absorbing microphone picks up ambient noise in the ear canal;

[0019] ii. The FB rear-feedback noise reduction and shock-reduction microphone converts the low-frequency vibration sound picked up and the ambient noise in the ear canal into a first noise audio signal and sends it to the noise reduction controller;

[0020] ⅲ noise reduction controller generates an inverted first inverted noise audio signal according to the first noise audio signal;

[0021] iv. The noise reduction controller sends the first inverted phase noise audio signal to the speaker, which plays the first inverted phase noise. The first inverted phase noise is superimposed and offset with the low-frequency vibration sound and the ambient noise to achieve noise reduction.

[0022] Preferably, the noise reduction depth of the FB feedback noise reduction and shock reduction microphone is adjusted to -20dB.

[0023] Preferably, the noise reduction method of the FF feedforward noise reduction and vibration reduction microphone includes the following steps:

[0024] i. The first sensor of the FF Feedforward Noise Cancelling and Shock-Cancelling Microphone picks up low-frequency vibration sounds, while the second sensor of the FF Feedforward Noise Cancelling and Shock-Cancelling Microphone picks up ambient noise outside the ear canal;

[0025] ⅱ. The FF feedforward noise reduction and shock-absorbing microphone converts the low-frequency vibration sound picked up and the ambient noise outside the ear canal into a second noise audio signal and sends it to the noise reduction controller;

[0026] ⅲ noise reduction controller generates an inverted second noise audio signal according to the second noise audio signal;

[0027] iv. The noise reduction controller sends the second noise audio signal to the speaker, which plays the second anti-phase noise. The second anti-phase noise is superimposed and offset with the low-frequency vibration sound and the ambient noise to achieve noise reduction.

[0028] Preferably, the noise reduction depth of the combination of the FB feedback noise reduction and vibration reduction microphone and the FF feedforward noise reduction and vibration reduction microphone is adjusted to -53 to -55dB.

[0029] The beneficial effect of the present invention is as follows: the present invention is provided with a shock-absorbing microphone and a noise reduction controller on the PCBA circuit board of the TWS headset. The shock-absorbing microphone has a first sensor for picking up low-frequency vibration sound and a second sensor for picking up ambient noise. The first sensor is attached to the PCBA circuit board and is enclosed by the PCBA circuit board, and the second sensor is exposed and not enclosed by the PCBA circuit board. The external low-frequency vibration sound is transmitted to the PCBA circuit board, which will cause the PCBA circuit board to vibrate. The low-frequency vibration sound on the PCBA circuit board is picked up by the first sensor of the shock-absorbing microphone, and then the ambient noise is picked up by the second sensor. The low-frequency vibration sound and the ambient noise are converted into a noise audio signal and sent to the noise reduction controller. The noise reduction controller generates an inverted inverted noise audio signal according to the noise audio signal, and then sends it to the speaker. The speaker plays the inverted noise. The inverted noise is superimposed and offset with the low-frequency vibration sound and the ambient noise to achieve noise reduction. The noise reduction value can be improved to -53~-55dB, and the average depth of the noise reduction value in the frequency range of 20~400Hz can reach -40dB. The present invention uses a shock-absorbing microphone to solve the problem of reducing the bumpy noise caused by physical sound transmission such as buses, high-speed railways, trains, and subways when the noise-canceling headphones are in ANC mode. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 Graphs of noise signals received in the prior art when ANC is turned on and turned off.

[0031] Figure 2 This is a structural block diagram of the TWS headset with a shock-absorbing microphone of the present invention.

[0032] Figure 3 This is a structural schematic diagram of the welding process of the shock-absorbing microphone and PCBA circuit board of the present invention.

[0033] Figure 4 Schematic diagram of noise signals received by a common noise reduction microphone and a vibration reduction microphone of the present invention.

[0034] Figure 5 This is a step-by-step diagram of the noise reduction method for a shock-absorbing microphone.

[0035] Figure 6 This is a step-by-step diagram of the noise reduction method for the FB feedback noise reduction and shock-absorbing microphone.

[0036] Figure 7 This is a step-by-step diagram of the noise reduction method for the FF feedforward noise reduction and shock-reduction microphone. DETAILED DESCRIPTION

[0037] The structural principle and working principle of the present invention are further described in detail below with reference to the accompanying drawings.

[0038] like Figure 2 and Figure 3As shown, the present invention is a TWS headset with a shock-absorbing microphone, including a PCBA circuit board 1 and a speaker 2. The PCBA circuit board 1 is provided with a shock-absorbing microphone 3 and a noise reduction controller 4. The shock-absorbing microphone 3 has a first sensor 301 for picking up low-frequency vibration sound and a second sensor 302 for picking up ambient noise. The first sensor 301 is attached to the PCBA circuit board 1 and is enclosed by the PCBA circuit board 1, and the second sensor 302 is exposed and not enclosed by the PCBA circuit board 1; the noise reduction controller 4 is electrically connected to the shock-absorbing microphone 3 and the speaker 2 respectively. The shock-absorbing microphone 3 converts the picked-up low-frequency vibration sound and ambient noise into a noise audio signal and then sends it to the noise reduction controller 4. The noise reduction controller 4 generates an inverted noise audio signal according to the noise audio signal and sends it to the speaker 2 for playback. The frequency range of the low-frequency vibration sound picked up by the first sensor 301 of the shock-absorbing microphone 3 of the present invention is 20 to 400 Hz. Low-frequency vibrations from the outside world are transmitted to PCBA 1, causing it to vibrate. The first sensor 301 of the shock-absorbing microphone 3 picks up the low-frequency vibrations, while the second sensor 302 picks up ambient noise. The low-frequency vibrations and ambient noise are then converted into a noise audio signal and sent to the noise reduction controller 4. The noise reduction controller then generates an inverted noise audio signal based on the noise audio signal, which is then sent to the speaker 2, which plays the inverted noise. The inverted noise, combined with the low-frequency vibrations and ambient noise, cancels each other out, achieving noise reduction. The noise reduction value can be increased to -53 to -55 dB, with an average noise reduction depth of -40 dB in the 20-400 Hz frequency range. This invention utilizes the shock-absorbing microphone 3 to address the problem of reducing the physically transmitted noise of buses, high-speed trains, trains, subways, and other vehicles when the noise-canceling headphones are in ANC mode.

[0039] like Figure 4 The figure shows the noise signals received by the common noise reduction microphone and the vibration reduction microphone of the present invention. Figure 4 The signal below is the noise signal received by the shock-absorbing microphone of the present invention. Figure 4 The signal above represents the noise signal received by an ordinary noise-canceling microphone. Ordinary microphones have a maximum reception AOP of 130dBSPL, while the shock-canceling microphone of the present invention avoids AOP saturation. The first sensor of the shock-canceling microphone of the present invention picks up mechanical vibrations, while the second sensor picks up ambient noise. When the second sensor reaches saturation, the first sensor, due to its sealing scheme, can attenuate the sound range by 40-60dBSPL, achieving the advantage of receiving a maximum AOP greater than 130dBSPL. The bumpy sounds of cars, trains, and high-speed trains, as well as the slamming of high-speed train / subway doors, are all greater than the microphone's AOP of 130dBSPL. However, the shock-canceling microphone of the present invention can remain within its normal reception range, picking up sound and outputting an inverted signal through the speaker to cancel out the noise.

[0040] like Figure 1As shown, the vibration reduction microphone 3 is an FF feedforward noise reduction vibration reduction microphone 31 and / or a FB feedback noise reduction vibration reduction microphone 32. That is, the vibration reduction microphone of the present invention can be applied to the FF feedforward noise reduction microphone alone, or to the FB feedback noise reduction microphone alone, or to a dual-feed noise reduction circuit combining the FF feedforward noise reduction microphone and the FB feedback noise reduction microphone.

[0041] like Figure 3 As shown, the shock-absorbing microphone 3 is soldered to the PCBA 1, which has a microphone hole 11. The second sensor 302 of the shock-absorbing microphone 3 is placed in the microphone hole 11. The shock-absorbing microphone 3 has two solder points 303, and the PCBA 1 also has two solder points 12. During soldering, the two solder points 303 of the shock-absorbing microphone 3 are soldered to the two solder points 12 of the PCBA 1. During soldering, it is important to ensure that the second sensor 302 of the shock-absorbing microphone 3 is placed in the microphone hole 11 of the PCBA 1, while the first sensor 301 of the shock-absorbing microphone 3 is closely attached to the PCBA 1 and enclosed by the PCBA 1.

[0042] like Figure 5 As shown, the noise reduction method of the TWS headset with a shock-absorbing microphone includes the following steps:

[0043] 1) The first sensor of the shock-absorbing microphone picks up low-frequency vibration sounds, while the second sensor of the shock-absorbing microphone picks up ambient noise;

[0044] 2) The vibration-reducing microphone converts the low-frequency vibration sound and ambient noise it picks up into a noise audio signal and sends it to the noise reduction controller;

[0045] 3) The noise reduction controller generates an inverted noise audio signal according to the noise audio signal;

[0046] 4) The noise reduction controller sends the anti-phase noise audio signal to the speaker, which plays the anti-phase noise. The anti-phase noise is superimposed and offset by the low-frequency vibration sound and ambient noise to achieve noise reduction.

[0047] like Figure 6 and Figure 7 As shown, the noise reduction method includes a noise reduction method of an FF feedforward noise reduction and shock reduction microphone and / or a noise reduction method of an FB feedback noise reduction and shock reduction microphone.

[0048] like Figure 6 As shown, the noise reduction method of the FB feedback noise reduction and shock reduction microphone includes the following steps:

[0049] i. The first sensor of the FB rear-feedback noise-cancelling and shock-absorbing microphone picks up low-frequency vibration sounds, while the second sensor of the FB rear-feedback noise-cancelling and shock-absorbing microphone picks up ambient noise in the ear canal;

[0050] ii. The FB rear-feedback noise reduction and shock-reduction microphone converts the low-frequency vibration sound picked up and the ambient noise in the ear canal into a first noise audio signal and sends it to the noise reduction controller;

[0051] ⅲ noise reduction controller generates an inverted first inverted noise audio signal according to the first noise audio signal;

[0052] iv. The noise reduction controller sends the first inverted phase noise audio signal to the speaker, which plays the first inverted phase noise. The first inverted phase noise is superimposed and offset with the low-frequency vibration sound and the ambient noise to achieve noise reduction.

[0053] like Figure 6 As shown, the noise reduction depth of the FB feedback noise reduction and shock reduction microphone is adjusted to -20dB.

[0054] like Figure 7 As shown, the noise reduction method of the FF feedforward noise reduction and shock reduction microphone includes the following steps:

[0055] i. The first sensor of the FF Feedforward Noise Cancelling and Shock-Cancelling Microphone picks up low-frequency vibration sounds, while the second sensor of the FF Feedforward Noise Cancelling and Shock-Cancelling Microphone picks up ambient noise outside the ear canal;

[0056] ⅱ. The FF feedforward noise reduction and shock-absorbing microphone converts the low-frequency vibration sound picked up and the ambient noise outside the ear canal into a second noise audio signal and sends it to the noise reduction controller;

[0057] ⅲ noise reduction controller generates an inverted second noise audio signal according to the second noise audio signal;

[0058] iv. The noise reduction controller sends the second noise audio signal to the speaker, which plays the second anti-phase noise. The second anti-phase noise is superimposed and offset with the low-frequency vibration sound and the ambient noise to achieve noise reduction.

[0059] like Figure 7 As shown, the noise reduction depth of the combination of the FB feedback noise reduction and shock reduction microphone and the FF feedforward noise reduction and shock reduction microphone is adjusted to -53 to -55dB.

[0060] The above description is only a preferred embodiment of the present invention. Any slight modifications, equivalent changes and modifications made to the above embodiment according to the technical solution of the present invention are within the scope of the technical solution of the present invention.

Claims

1. A TWS headset with a shock-absorbing microphone, characterized by: The invention comprises a PCBA circuit board and a speaker. A shock-absorbing microphone and a noise reduction controller are provided on the PCBA circuit board. The shock-absorbing microphone has a first sensor for picking up low-frequency vibration sound and a second sensor for picking up ambient noise. The first sensor is attached to the PCBA circuit board and enclosed by the PCBA circuit board, while the second sensor is exposed and not enclosed by the PCBA circuit board. The noise reduction controller is electrically connected to the shock-absorbing microphone and the speaker respectively. The shock-absorbing microphone converts the picked-up low-frequency vibration sound and ambient noise into noise audio signals and then sends them to the noise reduction controller. The noise reduction controller generates an inverted noise audio signal according to the noise audio signal and sends it to the speaker for playback.

2. The TWS earphones with a shock-absorbing microphone according to claim 1, characterized in that: The vibration reduction microphone is an FF feedforward noise reduction and vibration reduction microphone and / or a FB feedback noise reduction and vibration reduction microphone.

3. The TWS earphones with a shock-absorbing microphone according to claim 1, characterized in that: The frequency range of the low-frequency vibration sound picked up by the first sensor of the shock-absorbing microphone is 20 to 400 Hz.

4. The TWS earphones with a shock-absorbing microphone according to claim 1, characterized in that: The shock-absorbing microphone is welded on a PCBA circuit board. The PCBA circuit board is provided with a microphone hole, and the second sensor of the shock-absorbing microphone is placed in the microphone hole.

5. The noise reduction method for TWS earphones with a shock-absorbing microphone according to claim 1, characterized in that: The steps include: 1) The first sensor of the shock-absorbing microphone picks up low-frequency vibration sounds, while the second sensor of the shock-absorbing microphone picks up ambient noise; 2) The vibration-reducing microphone converts the low-frequency vibration sound and ambient noise it picks up into a noise audio signal and sends it to the noise reduction controller; 3) The noise reduction controller generates an inverted noise audio signal according to the noise audio signal; 4) The noise reduction controller sends the anti-phase noise audio signal to the speaker, which plays the anti-phase noise. The anti-phase noise is superimposed and offset by the low-frequency vibration sound and ambient noise to achieve noise reduction.

6. The noise reduction method for a TWS headset with a shock-absorbing microphone according to claim 5, characterized in that: The noise reduction method includes a noise reduction method of an FF feedforward noise reduction and shock reduction microphone and / or a noise reduction method of an FB feedback noise reduction and shock reduction microphone.

7. The noise reduction method for a TWS headset with a shock-absorbing microphone according to claim 6, characterized in that: The noise reduction method of the FB feedback noise reduction and shock reduction microphone includes the following steps: i. The first sensor of the FB rear-feedback noise-cancelling and shock-absorbing microphone picks up low-frequency vibration sounds, while the second sensor of the FB rear-feedback noise-cancelling and shock-absorbing microphone picks up ambient noise in the ear canal; ii. The FB rear-feedback noise reduction and shock-reduction microphone converts the low-frequency vibration sound picked up and the ambient noise in the ear canal into a first noise audio signal and sends it to the noise reduction controller; ⅲ noise reduction controller generates an inverted first inverted noise audio signal according to the first noise audio signal; iv. The noise reduction controller sends the first inverted phase noise audio signal to the speaker, which plays the first inverted phase noise. The first inverted phase noise is superimposed and offset with the low-frequency vibration sound and the ambient noise to achieve noise reduction.

8. The noise reduction method for a TWS headset with a shock-absorbing microphone according to claim 7, characterized in that: The noise reduction depth of the FB feed-back noise reduction and shock reduction microphone is adjusted to -20dB.

9. The noise reduction method for a TWS headset with a shock-absorbing microphone according to claim 7, characterized in that: The noise reduction method of the FF feedforward noise reduction and shock reduction microphone includes the following steps: i. The first sensor of the FF Feedforward Noise Cancelling and Shock-Cancelling Microphone picks up low-frequency vibration sounds, while the second sensor of the FF Feedforward Noise Cancelling and Shock-Cancelling Microphone picks up ambient noise outside the ear canal; ⅱ. The FF feedforward noise reduction and shock-absorbing microphone converts the low-frequency vibration sound picked up and the ambient noise outside the ear canal into a second noise audio signal and sends it to the noise reduction controller; ⅲ noise reduction controller generates an inverted second noise audio signal according to the second noise audio signal; iv. The noise reduction controller sends the second noise audio signal to the speaker, which plays the second anti-phase noise. The second anti-phase noise is superimposed and offset with the low-frequency vibration sound and the ambient noise to achieve noise reduction.

10. The noise reduction method for a TWS headset with a shock-absorbing microphone according to claim 9, characterized in that: The noise reduction depth of the FB feedback noise reduction and shock reduction microphone combined with the FF feedforward noise reduction and shock reduction microphone is adjusted to -53 to -55dB.

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