Speech noise reduction method and device thereof

Abstract

The invention provides a voice noise-reducing method and a voice noise-reducing device. The voice noise-reducing method comprises the steps of calculating a smooth factor according to a voice activation judging result, calculating and obtaining a first energy spectrum of a first frequency-domain voice signal and a cross-correlation energy spectrum according the smooth factor, and calculating and obtaining a cross-correlation transfer function according to the first energy spectrum and the cross-correlation energy spectrum; calculating and obtaining an initial frequency-domain filter according a noise compensation factor, initial noise energy and the first energy spectrum; calculating the smooth window length according to the initial frequency-domain filter and the amplitude of the first frequency-domain voice signal; obtaining a frequency-domain filter by convolving the initial frequency-domain filter and the smooth window length; outputting a filtered first frequency-domain voice signal after the first frequency-domain voice signal is filtered through the frequency-domain filter. The invention also provides the voice noise-reducing device which is used for realizing the voice noise-reducing method. The voice noise-reducing method and the voice noise-reducing device, which are provided by the invention, have the characteristics that the noise tracking speed is fast, the calculating amount is less, the environmental noise can be effectively restrained, and the like.

Description

technical field [0001] The invention relates to the technical field of audio signal processing, in particular to a method and device for noise reduction of speech signals. Background technique [0002] With the development of social technology, people have higher and higher requirements for sound quality, especially for voice call quality. To ensure clear, noise-free and natural high-quality calls, the voice noise reduction function is indispensable for communication tools such as mobile phones and tablets. Take a mobile phone or a tablet computer as an example. Currently, products on the market are generally equipped with two microphones. One of the microphones is installed close to the vocal organs of the human body. The other microphone is installed at a position away from the vocal organs of the human body to pick up the environmental noise. The sound picked up by the two microphones is analyzed, and the voice signal emitted by the human body is denoised to obtain a hig...

AI Technical Summary

Problems solved by technology

[0003] At present, among the dual-microphone voice noise reduction methods applied to mobile phones or tablet computers, those with better noise reduction effects generally require a large amount of calculation, and need to be equipped with an independent noise reduction chip to run complex algorithms

For some relatively simple dual-microphone noise reduction methods, the noise reduction effect is often unsatisfactory, the residual noise is too large, or the noise reduction method has strict requirements on the direction of the voice source. If the method is not used correctly, the voice signal will be eliminated.

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