Single-channel real-time noise reduction method and system

A noise reduction system and single-channel technology, applied in the field of single-channel real-time noise reduction methods and systems, to achieve the effects of improving running speed, improving recognition rate, and improving intelligibility

Active Publication Date: 2020-05-08
声耕智能科技(西安)研究院有限公司
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Problems solved by technology

[0004] To sum up, in actual daily life, due to the diversity, complexity, and mutation of background noise, it is very challenging to process speech signals in real time based on a single channel and achieve the ideal noise reduction effect in an environment with background noise. There is an urgent need for a new single-channel real-time noise reduction method, system and device

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specific Embodiment

[0063] The embodiment of the present invention is described in conjunction with a specific noise reduction algorithm. On the one hand, it is to show the implementation process of the present invention more clearly, and on the other hand, it is convenient for those skilled in the related art to understand and implement. However, one or The number of specific algorithms is not intended to limit the invention. The following will describe in conjunction with a specific noise reduction algorithm.

[0064] In the embodiment of the present invention, include:

[0065] Signal Model: Follow the model equation below (displayed in time domain):

[0066] y(t)=x(t)+d(t)

[0067] Among them, x(t) is the pure speech signal, y(t) is the observed noisy speech signal, and d(t) is the noise signal;

[0068] In this model, it is assumed that the unknown pure speech signal x(t) is interfered by additive noise (background noise) d(t), and the noisy speech signal y(t) is uncorrelated with the pur...

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Abstract

The invention discloses a single-channel real-time noise reduction method and a single-channel real-time noise reduction system. The single-channel real-time noise reduction method comprises the following steps: step 1, converting a noisy analog voice signal acquired by a single channel into a noisy discrete voice signal; 2, preprocessing the noisy discrete voice signal obtained in the step 1 to obtain a preprocessed noisy discrete voice signal; 3, generating algorithm selection parameters according to different background noises in the preprocessed noisy discrete voice signals obtained in thestep 1; selecting a noise estimation method according to the algorithm selection parameter, and processing the preprocessed noisy discrete voice signal through the selected noise estimation method toobtain a denoised time domain voice signal; and 4, converting the denoised time domain voice signal obtained in the step 3 into a signal with continuous time domain and amplitude. According to the invention, the noise estimation method can be adjusted in real time according to different background noises, and noise reduction processing is carried out on noisy voice signals in real time.

Description

technical field [0001] The invention belongs to the technical field of voice signal processing, in particular to a single-channel real-time noise reduction method and system. Background technique [0002] Speech signals are unstable, and are easily interfered by various noises when collected in practical systems. These different types of noise have brought great challenges to the noise reduction processing of speech signals. In the past few decades, various noise spectrum estimation algorithms have been tried to estimate the noise, so as to perform noise reduction processing of speech signals. Accurate estimation of the noise spectrum is particularly important. If the noise spectrum is estimated too low, there will be residual noise in the speech signal. If the noise spectrum is estimated too high, the speech signal will be distorted and reduce intelligibility. For example, the traditional noise spectrum estimation method is based on voice activity detection (VoiceActivity ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L21/0208G10L21/0216
CPCG10L21/0208G10L21/0216
Inventor 陈龙黄海隆弢陈玮
Owner 声耕智能科技(西安)研究院有限公司
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