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Method and device for reducing noise of two microphones of terminal

A dual-microphone and microphone technology, applied in transducer circuits, speech analysis, instruments, etc., can solve the problems of loss of noise reduction function and affecting normal voice calls, etc., to achieve the effect of eliminating the decline of the effect and overcoming the limitations

Active Publication Date: 2013-05-01
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Once you adjust the hand-held state of the phone during a call, causing the distance between the main microphone and the sound source (usually the person's mouth) to change constantly, the noise reduction function will lose its effect
In some cases, if the distance between the primary microphone and the sound source is greater than or equal to the distance between the secondary microphone and the sound source, normal voice signals will also be suppressed by the noise reduction module, affecting normal voice calls, such as Figure 4 and Figure 5 shown

Method used

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  • Method and device for reducing noise of two microphones of terminal
  • Method and device for reducing noise of two microphones of terminal
  • Method and device for reducing noise of two microphones of terminal

Examples

Experimental program
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Embodiment 1

[0047] step 1, figure 2 with image 3 They are the front view and the side view of the mobile phone in the standard hand-holding posture in the call state, assuming that the earpiece of the terminal is close to the ear, the secondary microphone is near the earpiece, and the main microphone is close to the mouth in the standard hand-holding posture, and the length of the terminal is L. At this time, The distance between the main microphone and the sound source is the first standard distance Mainmiclen 0 , the distance between the secondary microphone and the sound source is the second standard distance Auxmiclen 0 , the standard three-dimensional angle of the terminal is α 1 ,β 1 ,γ 1 , the terminal uses the secondary microphone initial gain Auxmicgain 0 Perform noise reduction processing.

[0048] Step 2. When the handheld posture of the terminal changes, such as Figure 4 or Figure 5 The handheld state shown in the terminal records the actual three-dimensional angle...

Embodiment 2

[0056] step 1, figure 2 with image 3 They are the front view and the side view of the mobile phone in the standard hand-held posture in the call state, assuming that the earpiece of the terminal is close to the ear, and the vertical distance between the secondary microphone and the earpiece is h. In the standard hand-held posture, the main microphone is close to the mouth, and the length of the terminal is L , the vertical distance between the earpiece and the main microphone is L. At this time, the distance between the main microphone and the sound source is the first standard distance Mainmiclen 0 , the distance between the secondary microphone and the sound source is the second standard distance Auxmiclen 0 , the standard three-dimensional angle of the terminal is α 1 ,β 1 ,γ 1 , the terminal uses the secondary microphone initial gain Auxmicgain 0 Perform noise reduction processing.

[0057] Wherein, a shorter side of the terminal is used as the X axis, and a longe...

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Abstract

The invention discloses a method and a device for reducing noise of two microphones of a terminal, and relates to the technical field of communications. The method comprises the following steps of collecting handheld gesture information of the terminal in a real-time way during terminal conversation; according to the handheld gesture information, obtaining a first actual distance between a primary microphone of the terminal and a sound source, and a second actual distance between a secondary microphone of the terminal and the sound source; according to the first actual distance and the second actual distance, adjusting initial noise-reduction parameters in the terminal in a real-time way, so as to obtain a self-adaptive noise-reduction parameter; and according to the self-adaptive noise-reduction parameter, reducing the noise of the conversation audio frequency.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular to a method for noise reduction with dual microphones in a terminal and a related device. Background technique [0002] The use of dual-microphone noise reduction technology on mobile phones and other communication devices has become a mainstream trend. Dual-microphone noise reduction technology refers to the built-in two microphones in the mobile phone, which can realize the noise suppression function by collecting the voice signal and environmental noise of the call, such as figure 1 shown. Among them, the main microphone receives the voice signal and background noise signal of the call at the same time; the secondary microphone mainly collects the noise in the environment, and after processing the signal waveform, it is used to synthesize the sampling signal of the main microphone, so that the receiver of the call can only Hear the voice of the call, but not the ...

Claims

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Application Information

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IPC IPC(8): H04R3/00
CPCG10L21/02G10L2021/02165
Inventor 邢蓓蕾胡蝶
Owner ZTE CORP
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