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A speech enhancement method and system based on phase compensation

A speech enhancement and phase compensation technology, applied in speech analysis, speech recognition, instruments, etc., can solve the problems of phase spectrum compensation that cannot contain noisy speech, poor speech enhancement effect, etc.

Active Publication Date: 2020-06-16
TAIYUAN UNIV OF TECH
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Problems solved by technology

The compensation factor in the existing phase spectrum compensation algorithm is fixed, and it is impossible to flexibly compensate the phase spectrum of noisy speech, resulting in poor speech enhancement effect

Method used

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  • A speech enhancement method and system based on phase compensation
  • A speech enhancement method and system based on phase compensation
  • A speech enhancement method and system based on phase compensation

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Embodiment Construction

[0057] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0058] In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0059] First, the traditional phase compensation method is explained:

[0060] Suppose x(t) represents pure speech, v(t) represents stationary additive Gaussian noise, and x(t) and v(t) are independent of each oth...

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Abstract

The invention discloses a voice enhancement method and system based on phase compensation. The method comprises steps that a to-be-processed noisy voice signal is obtained; short-time Fourier transform of the noisy voice signal is carried out to obtain the amplitude spectrum and the phase spectrum of the noisy voice signal; a phase spectrum compensation function is obtained, and a Sigmoid type function whose factor is correspondingly changed with the change of the noisy voice signal-to-noise ratio is compensated; the phase spectrum of the noisy voice signal is compensated according to the phase spectrum compensation function to obtain the compensated phase spectrum; the amplitude of a pure voice signal is obtained according to the amplitude spectrum of the noisy voice signal; the compensated phase spectrum and the amplitude of the pure voice signal are reconstructed to obtain an enhanced voice signal. The method is advantaged in that compared with a traditional phase compensation voiceenhancement method, estimation of the noise is closer to the real noise power spectrum, the noise in an audio signal can be effectively inhibited, and intelligibility of the voice signal is improvedwhile the quality of the voice signal is enhanced.

Description

technical field [0001] The invention relates to the field of speech processing, in particular to a speech enhancement method and system based on phase compensation. Background technique [0002] In many situations, such as normal speech communication, hearing aids and automatic speech recognition, speech signals are severely degraded by different types of background noise. Therefore, removing noise components from degraded speech has always been the main purpose of research. At present, most single-channel speech enhancement methods change the magnitude spectrum of noisy speech to achieve the effect of speech enhancement, while ignoring the influence of the phase spectrum. This is because earlier studies have shown that the phase spectrum is less perceptually effective at high signal-to-noise ratios, so it is common practice to achieve speech enhancement by altering the magnitude spectrum. [0003] Recent studies have found that the phase spectrum also contains a lot of in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G10L15/22G10L21/02G10L21/0208G10L21/0316
CPCG10L15/22G10L21/02G10L21/0208G10L21/0316
Inventor 贾海蓉吉慧芳方玲武亚红李鸿燕张雪英
Owner TAIYUAN UNIV OF TECH
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