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De-reverberation method and device for speech data

A voice data and de-reverberation technology, applied in the field of communication, can solve the problems of dependent environment transfer function and high computational complexity, and achieve the effect of low computational intensity and easy implementation.

Inactive Publication Date: 2017-01-18
SHENZHEN GRANDSTREAM NETWORKS TECH +1
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Problems solved by technology

[0006] The purpose of the present invention is to provide a reverberation method for speech data, which aims to perform spectral subtraction operation on reverberant speech in the frequency domain to eliminate reverberation interference, thereby solving the problem of relying on the environmental transfer function and high computational complexity in reverberation. question

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[0025] In order to make the objectives, technical solutions, and advantages of the present invention clearer, the following describes the technical solutions in the embodiments of the present invention clearly and completely with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, but not to limit the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art fall within the protection scope of the present invention.

[0026] The basic principle of the present invention is: a new method of speech dereverberation based on the idea of ​​spectral subtraction, that is, by calculating the complex power spectrum of reverberated speech data in the frequency domain, weighting and averaging the smoothed complex power spectrum to obtain the spectral subtraction gain Function, the spectrum minus gain fu...

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Abstract

The invention provides a speech data de-reverberation method, so as to reduce the spectrum of reverberation speech in a frequency domain to eliminate reverberation interference. The method comprises the steps that a after fast Fourier transforming is carried out on current speech frame data, complex power calculation is carried out on acquired spectrum coefficients; b a complex power spectrum is used to calculate a spectrum subtraction gain function, and the spectrum subtraction gain function is used to suppress reverberation components in the frequency domain; c: fast Fourier transforming is used to acquire the de-reverberated windowed speech frame data of the time domain, and amplitude compensation processing is carried out; and d a speech frame is output. According to the de-reverberation method and device for speech data, the spectrum of reverberation speech is reduced to eliminate speech reverberation components; and without the prior knowledge of environments and signals and application limits, the method and device have the advantages of low calculation intensity, easy implementing, and can be applied in real-time transmission occasions.

Description

Technical field [0001] The invention belongs to the field of communication, and is especially based on the audio processing technology of mobile communication equipment. Background technique [0002] As we all know, the signal received by the microphone is susceptible to environmental reverberation. For example, in a room, voice is reflected by walls, ceilings, and the ground, and the signal received by the microphone is a mixed signal of direct and reflected sound signals. Reverberation will lead to a decrease in voice quality, and will significantly degrade system performance in speech recognition scenarios. [0003] The existing de-reverberation methods are mainly implemented based on the deconvolution method. One of the methods needs to know the impulse response or transfer function of the reverberant environment in advance, and then use this transfer function to construct an inverse filter to restore the original reverberant signal. Obviously, obtaining the transfer functio...

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Application Information

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IPC IPC(8): G10L21/0208G10L21/0224G10L21/0232
Inventor 韩翀蛟高可攀羊开云徐晓峰李夏宾
Owner SHENZHEN GRANDSTREAM NETWORKS TECH
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