Speech denoising method based on time frequency domain

A time-frequency, speech noise reduction technology, applied in speech analysis, instruments, etc., can solve problems such as poor noise reduction effect, achieve good noise reduction effect, reduce data processing amount, and improve signal-to-noise ratio

Active Publication Date: 2017-01-18
南京朗逸锐科电子科技有限公司
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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome the defects of the prior art, provide a voice noise reduction method based on t

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  • Speech denoising method based on time frequency domain
  • Speech denoising method based on time frequency domain
  • Speech denoising method based on time frequency domain

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Embodiment Construction

[0024] The present invention will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.

[0025] Such as figure 1 Shown, S_in is the sampling signal of one road microphone, and S_out is the output signal after noise reduction processing, and the control instruction of DSP output is used for controlling whether to carry out noise reduction processing and the depth of noise reduction, the voice of the present invention based on time-frequency domain Noise reduction method, comprising the following steps:

[0026] Step 1: Divide a single input sampling signal into time-ordered data blocks according to the number of discrete Fourier transform points in time order, then perform windowing on each data block, and perform discrete Fourier transform on the windowed data blocks to obtain the ...

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Abstract

The invention discloses a speech denoising method based on a time frequency domain. An input signal is divided into data blocks according to a sampling sequence, and each data block is converted into a frequency domain signal through discrete Fourier transform. A time frequency domain is formed by the data which is subjectd to discrete Fourier transform. A time frequency domain signal is subjected to statistical analysis and identification, a speech signal and a noise signal can be roughly separated, and the modeling of the two signals is carried out and characteristic values are extracted. According to the extracted characteristic values, a filter is designed and adjusted in real time, and the time frequency domain signal is filtered. Finally, the filtered time frequency domain signal is subjected to discrete Fourier transform to be a time domain audio signal. The method has the advantages that the system mechanical structure design and production process are simplified, the system cost is reduced, the frequency domain filter can be designed and adjusted in real time, and the input voice signal is filtered to achieve purpose of denoising, the cumbersome filter operation is simplified as single frequency domain gain multiplication operation, the processing calculation amount is reduced, and the processing efficiency is improved.

Description

technical field [0001] The invention relates to a method for reducing background noise picked up by a microphone, and can also reduce circuit noise introduced by a data acquisition circuit, etc., in particular to a voice noise reduction method based on a time-frequency domain, which belongs to the technical field of noise reduction processing. Background technique [0002] The noise problem has been around for a long time. In order to solve the problem of microphone picking up background noise in sound reinforcement, recording and communication, the most original method is to reduce the gain of the input loop (including the microphone) and strengthen the strength of the voice signal itself (such as speaking loudly, turning the microphone close to the lips, etc.). Another method is to improve the signal-to-noise ratio through the characteristics of the microphone, for example, use a directional microphone to reduce the spatial noise picked up by the microphone to achieve the ...

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Application Information

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IPC IPC(8): G10L21/0208G10L25/18
CPCG10L21/0208G10L25/18
Inventor 杨骏
Owner 南京朗逸锐科电子科技有限公司
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