WO2011116569A1

WO2011116569A1 - Mobile phone mute identification apparatus and mobile phone mute noise cancellation method and system

Info

Publication number: WO2011116569A1
Application number: PCT/CN2010/075179
Authority: WO
Inventors: 屈胜; 周文春
Original assignee: 中兴通讯股份有限公司
Priority date: 2010-03-23
Filing date: 2010-07-15
Publication date: 2011-09-29
Also published as: CN101895870A

Abstract

A mobile phone mute identification apparatus and a mobile phone mute noise cancellation method and system are disclosed in the present invention, wherein the mobile phone mute identification apparatus includes a filter module (10), which is used to receive audio signals sent by a mobile phone baseband chip or an audio encoding and decoding chip and perform filtering, to filter out speech analogue signals, and to output noise analogue signals, a rectification module (20), which is used to transfer the noise analogue signals into noise digital signals, a amplifier module (30), which is used to amplify the noise digital signals, and a switch output module (40), which is used to compare the amplified noise digital signals with an initiation threshold of the switch output module, and to output a compare result as an action condition of a mobile phone mute noise cancellation. The present invention, through automatically identifying a mobile phone uplink mute mode, and closing a gain amplifier connected to a mobile phone phonation apparatus or reducing audio frequency power output to the mobile phone phonation apparatus, can avoid noise interference in an uplink mute mode, achieve the purpose of mute noise cancellation, and reduce the mobile phone power dissipation at the same time.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the field of mobile phone applications, and in particular, to a device for recognizing a mute recognition of a mobile phone and a method and system for denoising the mobile phone while muting. BACKGROUND During a mobile phone call, if one party has other things to deal with without hang up the phone, but does not want the other party to hear his voice, he/she often chooses to mute up. Ideally, there will be no sound on the other side of the receiver. However, in practical applications, there will still be annoying noise in the receiver's earpiece. The reason is very simple. When there is no signal input, the internal noise and external antenna input noise will cause a high noise level at the output of the receiver. The existing mobile phone receiving end audio processing system shown in Figure 1 is received. The terminal cannot recognize that the other party has been muted up, so the audio power gain amplifier 3 at the receiving end will still drive the handset, resulting in extremely high noise output. This phenomenon is particularly evident in the mode of using hands-free listening. In summary, if the receiving end can recognize that the other party has been mute up, and turn off the audio power gain amplifier 3 or reduce the audio signal power output to the earpiece, the noise can be eliminated and the power consumption of the receiving end can be saved. SUMMARY OF THE INVENTION An object of the present invention is to provide a device for silently recognizing a mobile phone and a method and system for silently denoising the mobile phone, so that when the calling party is muted up, the receiving party cancels the interference of the still existing noise signal. The present invention provides a device for silently recognizing a mobile phone, comprising: a filtering module, configured to receive and filter an audio signal sent by a baseband chip or an audio codec chip of a mobile phone, filter out a voice analog signal, and output a noise analog signal; a rectifier module, configured to convert the noise analog signal into a noise digital signal; and an amplification module, configured to amplify the noise digital signal; The switch output module is configured to compare the amplified noise digital signal with a start threshold of the switch output module, and output the result as a comparison result of the mute denoising action condition of the mobile phone. Further, the device may further include an amplification sensitivity module configured to set an amplification parameter of the amplification module. Further, the device may further include a switch sensitivity module for setting a start threshold of the switch output module. Further, the switch output module may further include a timer for timing the continuous state in which the noise digital signal is greater than the start threshold. The invention provides a method for silently denoising a mobile phone, which comprises: filtering, rectifying, amplifying, and outputting a noise digital signal on an audio signal sent by a baseband chip or an audio codec chip of a mobile phone during a call state of the mobile phone; The noise digital signal is compared with a preset start threshold, and the comparison result is sent to a power gain amplifier enable control pin connected to the mobile phone sounding device; the power gain amplifier switch is controlled according to the comparison result. Further, controlling the switch of the gain amplifier according to the comparison result comprises: turning off the power gain amplifier when the noise digital signal is greater than the start threshold; and turning the power gain amplifier on when the noise digital signal is less than the start threshold. Further, the method further includes: setting a time parameter to time the continuous state when the noise digital signal is greater than the start threshold. The invention provides a system for realizing silent cancellation of a mobile phone, comprising: a mobile phone baseband chip or an audio codec chip for outputting an audio signal, a mobile phone sounding device, and a power gain amplifier connected to the mobile phone sounding device, wherein The utility model comprises a mobile phone mute identification device, comprising: a filtering module, configured to receive and filter an audio signal sent by a mobile phone baseband chip or an audio codec chip, filter out a voice analog signal, and output a noise analog signal; and a rectifier module, configured to simulate noise Converting the signal into a noisy digital signal; The amplifying module is configured to amplify the noise digital signal; the switch output module is configured to compare the amplified noise digital signal with a starting threshold of the switch output module, and output the comparison result to the power gain amplifier enable control pin. Further, the mobile phone mute recognition device may further include an amplification sensitivity module configured to set an amplification parameter of the amplification module. Further, the mobile phone mute recognition device may further include a switch sensitivity module for a startup threshold of the device switch output module. Further, the switch output module may further include a timer for timing the continuous state in which the noise digital signal is greater than the start threshold. The invention further provides a method for silently denoising a mobile phone, which comprises: filtering, rectifying, amplifying, and outputting a noise digital signal on an audio signal sent by a baseband chip or an audio codec chip of a mobile phone under a call state of the mobile phone; The noise digital signal is compared with a preset start threshold, and the comparison result is sent to the baseband chip or the audio codec chip of the mobile phone; and the audio signal power output to the mobile phone sounding device is controlled according to the comparison result. Further, controlling the audio signal power output to the mobile phone sounding device according to the comparison result includes: when the noise digital signal is greater than the startup threshold, the mobile phone baseband chip or the audio codec chip reduces the gain amplification parameter value of the mobile phone baseband chip or the audio codec chip; The noise digital signal is less than the startup threshold, and the gain amplification parameter value of the mobile phone baseband chip or the audio codec chip does not change. Further, controlling the audio signal power output to the mobile phone sounding device according to the comparison result includes: when the noise digital signal is greater than the startup threshold, the mobile phone baseband chip or the audio codec chip sends the control signal to the adjustable power gain amplifier connected to the mobile phone sounding device. , reducing the gain amplification parameter value of the adjustable power gain amplifier; when the noise digital signal is less than the startup threshold, the gain amplification parameter value of the adjustable power gain amplifier is unchanged. Further, controlling the audio signal power outputted to the mobile phone sounding device according to the comparison result further includes: when the noise digital signal is greater than the startup threshold, the mobile phone baseband chip or the audio codec chip sends the control signal to the adjustable power gain connected to the mobile phone sounding device. The amplifier reduces the gain amplification parameter value of the adjustable power gain amplifier; when the noise digital signal is less than the startup threshold, the gain amplification parameter value of the adjustable power gain amplifier does not change. Further, the method may further include: setting an amplification parameter to control the amplification parameter in the amplification step. The invention further provides a system for silently denoising a mobile phone, comprising: a mobile phone baseband chip or an audio codec chip for outputting an audio signal, controlling the audio signal power output to the mobile phone sounding device, a mobile phone sounding device and a mobile phone sounding device The connected power gain amplifier is characterized in that it further comprises a mobile phone mute identification device, comprising: a filtering module, configured to receive and filter an audio signal sent by the baseband chip or the audio codec chip of the mobile phone, filter out the voice analog signal, and output noise. An analog signal; a rectifier module for converting the noise analog signal into a noise digital signal; an amplification module for amplifying the noise digital signal; and a switch output module for performing the amplified noise digital signal and the start threshold of the switch output module Compare, output the comparison result to the mobile phone baseband chip or audio codec chip. Further, the mobile phone mute recognition device may further include an amplification sensitivity module configured to set an amplification parameter of the amplification module. Further, the mobile phone mute recognition device may further include a switch sensitivity module for a startup threshold of the device switch output module. Further, the switch output module may further include a timer for timing the continuous state in which the noise digital signal is greater than the start threshold. The mobile phone mute recognition device and the mobile phone mute denoising method and system provided by the invention can automatically Identify the mobile phone's uplink mute mode, turn off the gain amplifier connected to the mobile phone sound device or reduce the audio signal power output to the mobile phone sound device, avoid the noise interference in the uplink mute mode, achieve true mute noise reduction, and reduce the power consumption of the mobile phone. . BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic structural diagram of an audio processing system of a mobile phone receiving end; FIG. 2 is a schematic structural diagram of a mobile phone mute identification device according to an embodiment of the present invention; FIG. 3 is a schematic diagram of a mobile phone silent denoising according to another embodiment of the present invention; FIG. 4 is a system structural diagram of the embodiment of FIG. 3; FIG. 5 is a flowchart of a method for silently denoising a mobile phone according to another embodiment of the present invention; FIG. 6 is a system structure of the embodiment of FIG. Figure. The implementation, functional features, and advantages of the present invention will be further described in conjunction with the embodiments herein. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the process of a mobile phone call, the receiving end recognizes the uplink silent mode of the transmitting end, turns off the local power gain amplifier or reduces the amplification power of the audio signal to achieve noise cancellation. Referring to FIG. 2, an embodiment of the present invention provides a mobile phone mute identification device 70, which mainly includes: a filtering module 10, configured to receive and filter an audio signal sent by a baseband chip or an audio codec chip of a mobile phone, and filter out a voice analog signal. And outputting a noise analog signal; the rectifier module 20 is configured to convert the noise analog signal into a noise digital signal; the amplification module 30 is configured to amplify the noise digital signal; and the switch output module 40 is configured to use the amplified noise digital signal and the switch The startup thresholds of the output module 40 are compared, and the output is used as a comparison result of the mute denoising action conditions of the mobile phone. In this embodiment, the device 70 recognizes that the mobile phone is in the uplink silent mode or the normal voice call mode, and sends a low level 0 or a high level 1 according to the recognition result, as a strip triggering the mobile phone silent noise canceling action. The working principle of the device is described in detail below with reference to FIG. 2: When the mobile phone is in a call state, due to internal noise and external antenna input noise, the receiving end receives a noise analog signal whether it is a normal voice call or an uplink silent mode. However, the noise analog signal power in the normal voice call mode is much lower than the noise analog signal power in the uplink silent mode. According to the difference of the noise analog signal power in the two states, the implementation device 70 can recognize that the mobile phone is in a normal voice call. Mode or uplink mute mode. The implementation device 70 receives the audio signal sent by the mobile phone baseband chip or the audio codec chip, and then obtains a noise digital signal for comparison by filtering, rectifying, and amplifying, and compares with the startup threshold of the switch output module 40, if the noise current level If the threshold is greater than the startup threshold, the mobile phone is in the uplink silent mode, and the switch output module 40 outputs a low level 0 to trigger the next step of the mobile phone to cancel the noise. If the noise current level is lower than the startup threshold, the mobile phone is in the normal voice call mode, and the switch output module 40 Output high level 1, the phone audio signal is output normally. The above-mentioned mobile phone mute recognition device 70 can set the amplification sensitivity module 50 and the switch sensitivity module 60 as needed, the amplification sensitivity module 50 is used to adjust the amplification parameter of the amplification module 30, and the switch sensitivity module 60 is used to adjust the activation threshold of the switch output module 40. In order to ensure the user's subjective feeling, the switch output module 40 may also be internally provided with a timer. If the output level of the amplification module 30 is always greater than the startup threshold set by the switch sensitivity module 60 within a predetermined time, the switch output module 40 outputs氐 Level 0. The mobile phone mute recognition device 70 can automatically recognize the mobile phone silent mute mode to trigger the mobile phone mute denoising action, avoiding noise interference and reducing the power consumption of the mobile phone. Referring to FIG. 3, another embodiment of the present invention provides a method for silently canceling a mobile phone, including the following steps: Step 101: In a mobile phone call state, filter an audio signal output by a baseband chip or an audio codec chip of a mobile phone, and filter out voice. Analog signal, preserving the noise analog signal; Step 102, rectifying the noise analog signal, converting the noise analog signal into a noise digital signal; Step 103, amplifying the noise digital signal; Step 104, and amplifying the noise digital signal with preset A good start threshold is compared. If the noise digital signal is greater than the start threshold, the low level 0 is output to connect with the mobile phone sound device. Connect the power gain amplifier to step 106; if the noise digital signal is less than the start threshold, output a high level 1 to the power gain amplifier connected to the mobile phone sounding device, and perform step 105; Step 105, the power gain connected to the mobile phone sounding device The amplifier is turned on and the audio signal is output; in step 106, the power gain amplifier connected to the mobile phone sounding device is turned off, and the mobile phone is muted and denoised. In step 103, the amplification parameter may be set as needed; in step 104, the startup threshold parameter may be set according to requirements, and step 104 may further set a time parameter to time the continuous state of the noise current level greater than the startup threshold. During the specified time, the noise current level is always greater than the startup threshold, and step 4 is performed 106, otherwise step 4 is performed. The above-mentioned mobile phone silent noise canceling method can automatically recognize the mobile phone uplink silent mode, turn off the power gain amplifier connected with the mobile phone sounding device, avoid the noise interference in the uplink silent mode, achieve true silent noise cancellation, and reduce the power consumption of the mobile phone. Referring to FIG. 4, a system structural diagram of another embodiment of the present invention includes: a mobile phone baseband chip or an audio codec chip 301 for outputting an audio signal; a mobile phone sounding device 304 and a power gain amplifier 303 connected to the mobile phone sounding device 304. The mobile phone mute identification device 302 includes the following functional modules: a filtering module, configured to receive and filter an audio signal sent by the mobile phone baseband chip or the audio codec chip 301, filter out the voice analog signal, and output a noise analog signal; For converting a noise analog signal into a noise digital signal; an amplification module for amplifying the noise digital signal; and a switch output module, configured to compare the amplified noise digital signal with a start threshold of the switch output module, and output the comparison result to Power gain amplifier 303 enables the control pin. The working principle of the system in this embodiment is: The noise analog signal power of the normal voice call mode is smaller than the noise analog signal power of the uplink silent mode, and the mobile phone mute recognition device 302 is in the above difference, and is sent to the mobile phone baseband chip or the audio codec chip 301. The audio signal is identified, and the power gain amplifier is controlled according to the recognition result If the recognition result is the normal voice call mode, the switch output module of the mobile phone mute recognition device 302 outputs the high level 1 to the enable control pin of the power gain amplifier 303, the power gain amplifier 303 is turned on, and the signal is output; In the uplink silent mode, the switch output module of the mobile phone mute recognition device 302 outputs a low level 0 to the enable control pin of the power gain amplifier 303, the power gain amplifier 303 is turned off, and the mobile phone is muted. The mobile phone mute recognition device 302 sets an amplification sensitivity module, a switch sensitivity module, and a timer according to requirements, and the amplification sensitivity module is configured to set an amplification parameter of the amplification module, and the switch sensitivity module is configured to set a startup threshold of the switch output module, and the timer is used to The noise digital signal is greater than the continuous state of the startup threshold for timing. If the noise digital signal is always greater than the startup threshold within a predetermined time, the switch output module outputs a low level 0, and the power gain amplifier 303 is closed, that is, the action of musing the uplink. A delay of a certain time is made instead of turning off the power gain amplifier 303 immediately after detecting the uplink mute. The above-mentioned mobile phone silent noise cancellation system can automatically recognize the mobile phone silent mute mode, turn off the power gain amplifier connected with the mobile phone sounding device, avoid the noise interference in the uplink silent mode, achieve true mute noise reduction, and reduce the power consumption of the mobile phone. Referring to FIG. 5, a method for silently canceling a mobile phone according to another embodiment of the present invention includes the following steps: Step 201: In a mobile phone call state, filtering an audio signal output by a baseband chip or an audio codec chip of a mobile phone, and filtering out a voice analog signal. Retaining the noise analog signal; Step 202, rectifying the noise analog signal, converting the noise analog signal into a noise digital signal; Step 203, amplifying the noise digital signal; Step 204, and setting the amplified noise digital signal with a preset The startup threshold is compared. If the noise digital signal is greater than the startup threshold, the low level 0 is output to the mobile phone baseband chip or the audio codec chip, and step 206 is performed; if the noise digital signal is less than the startup threshold, the high level 1 is output to the mobile phone baseband. The chip or the audio codec chip performs step 205; step 4 gathers 205, and the audio signal outputs normally; step 206, reduces the audio signal power output to the mobile phone sounding device, and the mobile phone mute and denoise. Wherein, step 206 can achieve the reduction of the audio signal gain amplification parameter by the following two methods:

1) The baseband chip or audio codec chip of the mobile phone reduces the gain amplification parameter value of the baseband chip or the audio codec chip of the mobile phone;

2) When the power gain amplifier connected to the mobile phone sounding device is an adjustable power gain amplifier, the mobile phone baseband chip or the audio codec chip sends a control signal to the adjustable power amplifier to reduce the amplification parameter of the adjustable power amplifier; Step 206 When the power gain amplifier connected to the mobile phone sounding device is not adjustable, only mode 1) can be used to reduce the audio signal power output to the mobile phone sounding device. When the power gain amplifier connected to the mobile phone sounding device is adjustable, the mode 1 can be selected. Or mode 2), or mode 1) and mode 2) simultaneously. In step 203 of the above method, the amplification parameter may be set according to requirements; in step 204, the startup threshold parameter may be set according to requirements, and step 204 may further set a time parameter to time the continuous state of the noise current level greater than the startup threshold, if If the noise current level is always greater than the startup threshold within the specified time, step 206 is performed; otherwise, step 205 is performed. The above-mentioned mobile phone mute denoising method can automatically recognize the mobile phone uplink mute mode, reduce the audio signal output power, and make the noise analog signal of the receiving end very low, achieve the mute noise elimination effect and at the same time take care of the user's feeling, and avoid the user being completely muted. The illusion of a broken call. Referring to FIG. 6, a system structure diagram of another embodiment of the present invention includes: a mobile phone baseband chip or an audio codec chip 401, configured to output an audio signal and control audio signal power output to the mobile phone sounding device; the mobile phone sounding device 404 and Power amplifier amplifier connected to mobile phone sounding device 404

403; a mobile phone mute identification device 402, comprising the following functional modules: a filtering module, configured to receive an audio signal sent by a mobile phone baseband chip or an audio codec chip 401 and filter, filter out a voice analog signal, and output a noise analog signal; , for converting a noise analog signal into a noise digital signal; an amplification module, configured to amplify the noise digital signal; The switch output module is configured to compare the amplified noise digital signal with a startup threshold of the switch output module, and output the comparison result to the mobile phone baseband chip or the audio codec chip 401. The working principle of the system in the above embodiment is: The noise analog signal power of the normal voice call mode is smaller than the noise analog signal power of the uplink silent mode, and the mobile phone mute recognition device 402 is in the above difference, and is sent to the mobile phone baseband chip or the audio codec chip 401. The audio signal is identified, and the audio signal power output to the handset sounding device 404 is controlled based on the recognition result. It should be noted that the system uses the adjustment parameter of the adjustment control audio signal instead of directly turning off the power gain amplifier 403, because it is considered that the user may generate the illusion that the other party hangs up or the signal is interrupted in a completely muted state. If the recognition result is a normal voice call mode, the switch output module of the mobile phone mute recognition device 402 outputs a high level 1 to the mobile phone baseband chip or the audio codec chip 401, and the mobile phone baseband chip or the audio codec chip 401 works normally, and the signal output; The recognition result is the uplink silent mode, and the switch output module of the mobile phone mute recognition device 402 outputs a low level 0 to the mobile phone baseband chip or the audio codec chip 401, and the mobile phone baseband chip or the audio codec chip 401 reduces the audio output to the mobile phone sounding device 404. Signal power. The mobile phone baseband chip or the audio codec chip 401 reduces the audio signal amplification parameters according to the following two methods:

1) The mobile phone baseband chip or audio codec chip 401 reduces the gain amplification inside the mobile phone baseband chip or the audio codec chip 401; 2) when the power gain amplifier 403 connected to the mobile phone sounding device 404 is an adjustable power gain amplifier, the mobile phone The baseband chip or audio codec chip 401 sends a control signal to the power gain amplifier 403 to reduce the amplification parameter of the power gain amplifier 403; when the power gain amplifier 403 connected to the handset sounding device 404 is not adjustable, only the mode 1) can be reduced. The audio signal power output to the mobile phone sounding device 404, when the power gain amplifier 403 connected to the mobile phone sounding device 404 is adjustable, may select either mode 1) or mode 2), or mode 1) and mode 2) At the same time. The mobile phone mute recognition device 402 sets an amplification sensitivity module, a switch sensitivity module, and a timer according to requirements, and the amplification sensitivity module is configured to set an amplification parameter of the amplification module, and the switch sensitivity module is configured to set a startup threshold of the switch output module, and the timer is used to Noise digital signal If the noise digital signal is always greater than the startup threshold within a specified time, the switch output module outputs a low level 0, that is, the uplink mute action is delayed for a certain period of time, instead of The amplification power of the audio signal is reduced immediately after the uplink mute is detected. The above-mentioned mobile phone silent noise canceling system realizes the automatic recognition of the mobile phone uplink silent mode, reduces the output power of the audio signal outputted to the mobile phone sounding device, and makes the noise analog signal of the receiving end very low, achieving the mute noise canceling effect and taking care of the user's feeling. Avoid the illusion that the user is interrupted by a completely silent call. The above description is only the preferred embodiment of the present invention, and is not intended to limit the scope of the invention, and the equivalent structure or equivalent flow transformation made by the specification and the drawings of the present invention may be directly or indirectly applied to other related The technical field is equally included in the scope of patent protection of the present invention.

Claims

Claim

A device for silently recognizing a mobile phone, comprising:

a filtering module, configured to receive and filter an audio signal sent by a baseband chip or an audio codec chip of the mobile phone, filter out the voice analog signal, and output a noise analog signal;

a rectifier module, configured to convert the noise analog signal into a noise digital signal; and an amplification module, configured to: amplify the noise digital signal;

And a switch output module, configured to compare the amplified noise digital signal with a start threshold of the switch output module, and output the result as a comparison result of the mute denoising action condition of the mobile phone.

2. The apparatus of claim 1 further comprising an amplification sensitivity module for setting an amplification parameter of the amplification module.

3. The apparatus of claim 1 or 2, further comprising a switch sensitivity module for setting the start threshold of the switch output module.

4. The apparatus according to claim 1 or 2, wherein the switch output module further comprises a timer for timing the continuous state in which the noise digital signal is greater than the start threshold.

5. A method for quietly denoising a mobile phone, characterized in that it comprises:

In the mobile phone call state, the audio signal transmitted by the baseband chip or the audio codec chip of the mobile phone is filtered, rectified and amplified, and the noise digital signal is output;

Comparing the noise digital signal with a preset start threshold, and transmitting the comparison result to a power gain amplifier enable control pin connected to the mobile phone sounding device;

The switch of the power gain amplifier is controlled according to the comparison result.

6. The method according to claim 5, wherein the controlling the switch of the gain amplifier according to the comparison result comprises:

When the noise digital signal is greater than the startup threshold, turning off the power gain amplifier;

When the noise digital signal is less than the start threshold, the power gain is placed on the female m turn on.

The method according to claim 5 or 6, wherein the method further comprises:

A time parameter is set to time the continuous state when the noise digital signal is greater than the start threshold.

The method according to claim 5 or 6, wherein the amplifying step further comprises: setting an amplification parameter.

9. A system for silently denoising a mobile phone, comprising: a mobile phone baseband chip or an audio codec chip for outputting an audio signal, a mobile phone sounding device, and a power gain amplifier connected to the mobile phone sounding device, characterized in that the mobile phone is further included A mute identification device, comprising:

And a switch output module, configured to compare the amplified noise digital signal with a start threshold of the switch output module, and output a comparison result to the power gain amplifier enable control pin.

10. The system according to claim 9, wherein the mobile phone mute recognition device further comprises an amplification sensitivity module, configured to set an amplification parameter of the amplification module.

The system according to claim 9 or 10, wherein the mobile phone mute recognition device further comprises a switch sensitivity module for the start threshold of the switch output module of the device.

12. The system of claim 9 or 10, wherein the switch output module further comprises a timer for timing the continuous state of the noise digital signal greater than the activation threshold.

13. A method for silently denoising a mobile phone, characterized in that it comprises:

Comparing the noise digital signal with a preset startup threshold, and transmitting the comparison result to the mobile phone baseband chip or the audio codec chip; The audio signal power output to the mobile phone sounding device is controlled according to the comparison result.

14. The method according to claim 13, wherein the controlling the audio signal power output to the mobile phone sounding device according to the comparison result comprises:

When the noise digital signal is greater than the startup threshold, the mobile phone baseband chip or the audio codec chip reduces a gain amplification parameter value of the mobile phone baseband chip or the audio codec chip;

When the noise digital signal is less than the start threshold, the gain amplification parameter value of the mobile phone baseband chip or the audio codec chip does not change.

The method according to claim 13, wherein the controlling the audio signal power output to the mobile phone sounding device according to the comparison result comprises:

When the noise digital signal is greater than the startup threshold, the mobile phone baseband chip or audio codec chip sends a control signal to an adjustable power gain amplifier connected to the mobile phone sounding device, and reduces the gain amplification of the adjustable power gain amplifier Parameter value

When the noise digital signal is less than the start threshold, the gain amplification parameter value of the adjustable power gain amplifier does not change.

The method according to claim 14, wherein the controlling the audio signal power output to the mobile phone sounding device according to the comparison result further comprises:

When the noise digital signal is greater than the startup threshold, the mobile phone baseband chip or the audio codec chip sends a control signal to the adjustable power gain amplifier connected to the mobile phone sounding device, and reduces the gain amplification parameter value of the adjustable power gain amplifier. ;

17. The method of claim 13 or 16, wherein the step of amplifying further comprises: setting an amplification parameter.

18. A system for silently denoising a mobile phone, comprising: a mobile phone baseband chip or an audio codec chip for outputting an audio signal, controlling an audio signal power output to a mobile phone sounding device, a mobile phone sounding device, and a mobile phone sounding device A power gain amplifier, further comprising a mobile phone mute identification device, comprising:

a filtering module, configured to receive audio sent by a mobile phone baseband chip or an audio codec chip And filtering the signal, filtering out the voice analog signal, and outputting the noise analog signal; the rectifier module is configured to convert the noise analog signal into a noise digital signal; and the amplifying module is configured to amplify the noise digital signal;

And a switch output module, configured to compare the amplified noise digital signal with an activation threshold of the switch output module, and output a comparison result to the mobile phone baseband chip or the audio codec chip.

19. The system of claim 18, wherein the handset mute identification device further comprises an amplification sensitivity module for setting an amplification parameter of the amplification module.

20. The system of claim 18 or 19, wherein the handset mute identification device further comprises a switch sensitivity module for the activation threshold of the switch output module of the device.

The system according to claim 18 or 19, wherein the switch output module further comprises a timer for timing the continuous state in which the noise digital signal is greater than the start threshold.