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Noise suppression method and system

A technology for noise suppression and noisy speech. It is applied in speech analysis, instruments, etc. It can solve the problem that direct integration cannot be calculated, and achieve the effect of reducing the amount of calculation and improving performance.

Active Publication Date: 2013-09-11
SHANGHAI LINKCHIP SEMICON TECH CO LTD
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Problems solved by technology

[0011] 2. For the attenuation factor calculated by using Log-MMSE, direct integration cannot be calculated. There is a function expint in the mathematical software Matrix Laboratory (Matlab for short), which can be used to calculate the integral part of the exp exponent in formula 2 :

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Embodiment Construction

[0042]In order to make the object, technical solution and advantages of the present invention clearer, various embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. However, those of ordinary skill in the art can understand that, in each implementation manner of the present invention, many technical details are provided for readers to better understand the present application. However, even without these technical details and various changes and modifications based on the following implementation modes, the technical solution claimed in each claim of the present application can be realized.

[0043] A first embodiment of the present invention relates to a noise suppression method. The specific process is as image 3 shown, including the following steps:

[0044] Step 301, perform fast Fourier transform (FFT) on the noisy speech signal.

[0045] Step 302, perform noise estimation on the noisy speech signal after...

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Abstract

The invention relates to the field of voice signal processing, and discloses a noise suppression method and system. According to the noise suppression method, the prior signal to noise ratio and the posterior signal to noise ratio of a noisy voice signal are calculated, the estimated value of a clean voice signal in the short-term spectrum amplitude is calculated according to a maximum posterior MAP standard, the ratio of the estimated value and the noisy voice signal is calculated, an attenuation factor is obtained, and then inverse fast Fourier transform IFFT treatment is conducted on the noisy voice signal according to the attenuation factor obtained through calculation, so that calculated amount is greatly reduced during noise suppression. The noise suppression method and system is more suitable for practical application, and performance is also improved. Furthermore, when the attenuation factor is calculated, the calculation of the ratio of the first order and zero order of a first kind of the modified Bessel function is involved, and at the moment, the ratio is obtained through the table look-up method so that storage space can be further reduced; or the approximate calculation method is adopted, no storage table is required, and calculation is more simplified.

Description

technical field [0001] The invention relates to the field of speech signal processing, in particular to a noise suppression method and system thereof. Background technique [0002] Single microphone speech enhancement (i.e. noise suppression) usually adopts the processing method of frequency domain attenuation, including Fourier transform (FFT) analysis, noise estimation, calculation of anterior / posterior signal-to-noise ratio, calculation of attenuation factor, IFFT synthesis and other modules. The general process is as follows figure 1 shown. [0003] The noisy speech signal Y(w) collected by the microphone can be expressed as Y(w)=X(w)+N(w), where X(w) is a clean speech signal, and N(w) is an acoustic noise signal; X, N, Y respectively represent the short-time spectrum amplitude (Short-Time Spectral Amplitude, referred to as "STSA") of the corresponding signal, that is, X=|X(w)|, N=|N(w)|, Y=|Y (w)|. The noisy speech signal is transformed from the time domain to the fr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L21/0232
Inventor 谢单辉
Owner SHANGHAI LINKCHIP SEMICON TECH CO LTD
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