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Method and device for conducting self-adaption spectrum reduction and wavelet packet noise elimination processing on voice signals

A voice signal and wavelet packet technology, applied in voice analysis, instruments, etc., to achieve the effect of solving background noise problems

Inactive Publication Date: 2015-01-07
HUADI COMP GROUP
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  • Abstract
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Problems solved by technology

[0008] As can be seen from the technical solutions provided by the above-mentioned embodiments of the present invention, the embodiments of the present invention establish an additive model of the speech signal, and obtain the The estimated value of the power of the voice signal and the enhanced voice signal, and then the denoised voice signal is obtained according to the noise power estimated in real time and the wavelet transform matrix, which effectively solves the background noise problem of the voice signal in the conference call, and No noise such as other "musical noise" will be brought

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  • Method and device for conducting self-adaption spectrum reduction and wavelet packet noise elimination processing on voice signals

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Embodiment 1

[0017] A schematic structural diagram of a voice resource processing and switching service platform provided by an embodiment of the present invention is as follows figure 1 As shown, the platform mainly completes functions such as voice enhancement, transcoding of audio media streams, multi-channel audio mixing, recording, playback, and echo cancellation. The platform has the code stream forwarding function, which can forward the front-end audio stream to the dispatching console and storage device; it has powerful streaming media processing capabilities, and a single unit supports 1440 channels of voice non-blocking scheduling and forwarding processing, and a single conference supports 480 parties sound.

[0018] The above-mentioned I / O board in the voice resource processing and switching service platform: mainly realizes the external connection between the switch and the hardware platform, and at the same time, uses the pins of the front and rear boards to realize the trunk ...

Embodiment 2

[0084] This embodiment provides a device for performing adaptive spectral subtraction and wavelet packet denoising processing on speech signals, and its specific structure is as follows Figure 5 As shown, the following modules are included:

[0085] The power estimated value acquisition module 51 of the speech signal is used to calculate the power spectrum of the additive model of the speech signal, and obtains the described an estimate of the power of the speech signal;

[0086] The enhanced speech signal acquisition module 52 is used to perform inverse Fourier transform on the power estimate of the speech signal to obtain the enhanced speech signal;

[0087] Wavelet transform processing processing module 53, for utilizing wavelet transform matrix to carry out wavelet transform processing to the speech signal after described enhancement;

[0088] The denoising speech signal acquisition module 54 is used to perform threshold processing on the wavelet transform matrix, and i...

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Abstract

The embodiment of the invention provides a method and device for conducting self-adaption spectrum reduction and wavelet packet noise elimination processing on voice signals. The method mainly includes the steps of calculating power spectra of an additive model of the voice signals; obtaining a power estimation value of the voice signals according to the power spectra of the additive model of the voice signals and power estimation values of signals with noise and noisy signals; conducting inverse Fourier transformation on the power estimation value of the voice signals to obtain strengthened voice signals; conducting wavelet transformation processing on the strengthened voice signals through the adoption of a wavelet transformation matrix; and conducting threshold processing on the wavelet transformation matrix, conducting inverse transformation on the wavelet transformation matrix after threshold processing, and obtaining the voice signals without noise. By means of the method and device, the problem of the background noise of the voice signals in a teleconference is effectively solved; in addition, other kinds of noise like music noise cannot be caused.

Description

technical field [0001] The invention relates to the technical field of speech signal processing, in particular to a method and device for performing adaptive spectral subtraction and wavelet packet denoising processing on speech signals. Background technique [0002] In large-scale enterprises in my country's armed police, public security, railway, electric power, petroleum and petrochemical industries, production scheduling meetings are often held, and a large-capacity fully interactive conference call system is required. In these teleconferencing systems, there are a large number of heterogeneous voice resource terminals, and these heterogeneous voice resource terminals need to communicate with each other through conversion equipment, such as analog terminals in public communication networks, digital trunking systems, satellite networks and cable networks ( Telephones) realize intercommunication through program-controlled switches; VoIP voice telephone terminals realize in...

Claims

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Application Information

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IPC IPC(8): G10L21/0208
Inventor 张金明刘宇陈少卿
Owner HUADI COMP GROUP
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