Dual-microphone-based speech enhancement device and speech enhancement method

Abstract

The invention relates to a dual-microphone-based speech enhancement device. The device comprises a digital microphone array module, a first pulse density modulation decoder module, a directivity formation module, a second pulse density modulation decoder module, a speech enhancement processing module and an output module, wherein the digital microphone array module is used for receiving a time domain noisy speech digital signal; the first pulse density modulation decoder module is used for performing frame separation, down-sampling and filtering on the time domain noisy speech digital signal to form an initial down-sampling rate digital signal; the directivity formation module is used for performing directive formation on the initial down-sampling rate digital signal to form an initially noise-reduced directive output signal; the second pulse density modulation decoder module is used for performing the frame separation, the down-sampling, the filtering and accentuation on the initially noise-reduced directive output signal to form a second down-sampling rate digital signal; the speech enhancement processing module is used for performing speech enhancement processing on the second down-sampling rate digital signal; and the output module is used for outputting a background noise-removed speech signal. The invention also provides a dual-microphone speech enhancement device-based speech enhancement method. The device and the method have a good denoising effect.

Description

technical field [0001] The invention relates to a double-microphone-based speech enhancement device and a speech enhancement method. Background technique [0002] With the development of wireless communication, there are more and more mobile phone users around the world. The requirements of users for mobile phones are not only satisfied with calls, but also to be able to provide high-quality call effects. Especially the current development of mobile multimedia technology, the mobile phone Call quality is even more important. [0003] Due to the existence of a large amount of environmental noise, the signal-to-noise ratio of the voice signals collected by the microphones of mobile phones and other communication devices is generally not high enough. Especially in high-noise environments such as street cars, it is necessary to increase the volume to make the other party hear clearly. Therefore, it is necessary to improve the signal-to-noise ratio of the input voice and improve...

AI Technical Summary

Problems solved by technology

[0004] However, the traditional single-channel speech enhancement method has limited noise reduction effect and will cause large distortion to the speech

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