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Voice gain factor estimating device and method

A gain factor and voice technology, applied in voice analysis, instruments, etc., can solve the problems of large calculation and memory requirements, difficulty in implementing integer DSP chips, and difficulty in meeting real-time operation requirements, and meet the requirements of reducing storage and calculation , meet real-time requirements, and avoid the effect of nonlinear operations

Inactive Publication Date: 2006-04-26
VIMICRO CORP
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Problems solved by technology

[0022] It can be seen that in formula (4), there is one integral operation and two exponentiation operations. These two operations are very difficult to implement in an integer DSP chip due to their large amount of calculation and memory requirements. Even if they can Realization, it is also difficult to meet the real-time operation requirements

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  • Voice gain factor estimating device and method
  • Voice gain factor estimating device and method
  • Voice gain factor estimating device and method

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Embodiment Construction

[0057] When the input signal Y[i] has speech at the frequency point i, since the speech signal and the noise signal are not correlated, there are: Y 2 [i]=X 2 [i]+N 2 [i], where X[i] is the speech signal at frequency point i, which can be represented by FFT coefficients, etc.; N[i] is the noise signal at frequency point i, which can be represented by FFT coefficients, etc.; Y[i] is the input signal at frequency point i, which can be represented by FFT coefficients, etc., then:

[0058] X 2 [ i ] Y 2 [ i ] = X 2 [ i ] X 2 [ i ] ...

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Abstract

The invention discloses a phonetic gain factor estimation device and method, which comprises the following parts: prior signal-to-noise ratio estimation unit, pure phonetic gain calculation unit, conditional phonetic existence probability estimation unit and gain factor calculation unit. The method comprises the following steps: calculating the prior signal-to-noise ratio of input signal; calculating the pure phonetic gain value according to the prior signal-to-noise ratio of input signal; calculating the existence phonetic probability of input signal; calculating the phonetic gain factor of input signal in connection with the self-keep noise signal reduction factor. The invention realizes the estimation of phonetic gain factor without integral and differential calculation, which decreases the demand of memory capacity and calculation quantity in the integer DSP chip operation.

Description

technical field [0001] The invention relates to the technical field of speech enhancement, in particular to a speech gain factor estimation device and method in speech enhancement. Background technique [0002] In the voice communication of the mobile terminal, the conversation is often disturbed by strong background noise, which leads to the degradation of the voice quality, and even makes the two parties in the call unable to correctly understand the meaning expressed by the other party. At present, before the voice is sent to the communication module, it is usually subjected to noise reduction processing through a voice enhancement method, so as to improve the voice quality. [0003] The voice enhancement algorithm used in mobile terminal communication must have the following characteristics: small delay, no interference to communication; adapt to changing background noise, thereby effectively suppressing background noise; avoid introducing noise caused by manual processi...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L21/007
Inventor 林中松邓昊冯宇红王萧程
Owner VIMICRO CORP