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Digital auto gain control method and device

An automatic gain control, digital technology, applied in voice analysis, instruments, etc., can solve problems such as sudden changes in gain values ​​at sudden amplitude changes, affecting subjective auditory quality of voice, and voice changes

Inactive Publication Date: 2007-08-01
VIMICRO CORP
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this prior art can achieve the purpose of unifying the voice volume by amplifying the voice signal, it also has the following disadvantages: since the gain values ​​of adjacent frames are different, and the first or last sample point in the voice frame The energy value of the speech frame is different from the average energy value of the speech frame. Each frame is amplified with the same gain value, which will cause a sudden change in the gain value at the junction of adjacent speech frames and the sudden change in amplitude, resulting in a large instantaneous change in the speech , making the speech incoherent and affecting the subjective auditory quality of the speech

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  • Digital auto gain control method and device

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Embodiment 1

[0080] With reference to accompanying drawing 1, the digital automatic gain control method of the present embodiment comprises:

[0081] Step 1. Perform frame-by-frame processing on the voice signal to be input.

[0082] The voice signal to be input is divided into several frames according to a fixed duration (for example, 20 ms), each frame includes several voice samples, and each voice sample has its own amplitude value.

[0083] In step 2, the active voice detection module (VAD detection module) detects the input voice signal of each frame, and distinguishes two types of voice frames and noise frames.

[0084] Select a frame of speech signal as the current frame. The current frame is detected by the active voice detection module to obtain the information vad_flag whether the current frame contains a voice signal, if it contains a voice signal vad_flag=1, otherwise vad_flag=0. The main function of the active speech detection module is to distinguish the speech frame from t...

Embodiment 2

[0141] With reference to accompanying drawing 2, the digital automatic gain control method of the present embodiment comprises:

[0142] Step 100 (not shown in the figure), divide the speech signal to be input into frames.

[0143] That is, the speech signal to be input is divided into several frames according to a fixed duration (such as 20 ms), each frame includes several speech samples, and each speech sample has its own amplitude value.

[0144] Step 101, the active voice detection module (VAD detection module) detects the input voice signal of each frame, distinguishes it into two types of voice frame and noise frame, and saves the type of voice signal of each frame.

[0145] Select a frame of speech signal as the current frame. The current frame is detected by the active voice detection module to obtain the information vad_flag whether the current frame contains a voice signal, if it contains a voice signal vad_flag=1, otherwise vad_flag=0. The main function of the act...

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Abstract

This invention discloses one digital automatic gains control method and its device, which comprises the following steps: dividing the sound signals by fix interval into several frames; processing active sound test on each sound signal and dividing them into two types of sound frame and noise frame; according to current frame and next frame of sound types to processing slide on current sound samples gains between frames; processing frame slide on current each sound sample.

Description

technical field [0001] The invention relates to a method and device for processing voice signals, in particular to a method and device for controlling voice gain. Background technique [0002] After digital processing such as coding and enhancement is performed on the voice signal, the voice signal will generally be damaged to a certain extent. We can apply digital automatic gain control (AGC) to compensate for this impairment. The main purpose of the digital AGC algorithm is to process the received digital signal to make its amplitude relatively stable, thereby increasing the subjective auditory quality of the sound. [0003] There are two main types of common AGC structures: a feedback structure and a non-feedback structure. The adjustment method of the feedback method is: compare the amplitude of the output signal after the gain adjustment at the previous moment with our expected amplitude R to control the change of the gain, if the output is less than R, increase the g...

Claims

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Application Information

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IPC IPC(8): G10L21/00G10L21/02G10L11/02
Inventor 赵永刚冯宇红
Owner VIMICRO CORP
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