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Burst noise processing system and burst noise detection and suppression method and device

A technology of burst noise and detection method, which is applied in the fields of telephone structure, speech analysis, instrument, etc., and can solve problems such as difficult to effectively detect and suppress burst noise signals

Active Publication Date: 2015-04-29
SPREADTRUM COMM (SHANGHAI) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The problem solved by the present invention is that it is difficult for the prior art to effectively detect and suppress specific burst noise signals in the background environment

Method used

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  • Burst noise processing system and burst noise detection and suppression method and device
  • Burst noise processing system and burst noise detection and suppression method and device
  • Burst noise processing system and burst noise detection and suppression method and device

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Embodiment 1

[0061] In this embodiment, the specific implementation of the method for detecting sudden noise is described by taking the detection of sudden noise in a sound signal collected by a mobile terminal (such as a mobile phone) as an example.

[0062] Such as figure 2 As shown, step S201 is first performed to perform short-time Fourier transform on the input time-domain sound signal to obtain frame-by-frame spectrum information of the sound signal.

[0063] Step S201 is a process of generating spectral information of an input time-domain sound signal. Assuming that the mobile terminal has L microphones, the discrete digital sound signals collected by the current j-th channel microphone are denoted as x j (m), j=1,...,L, m represents the discrete moment of time, and the frame-by-frame spectrum information can be obtained through the short-time Fourier transform.

[0064] Specifically, the collected time-domain sound signal is overlapped and divided into frames to obtain a frame-b...

Embodiment 2

[0113] On the basis of Embodiment 1, this embodiment describes the specific implementation of the burst noise suppression method.

[0114] After detecting the frame-by-frame spectral information of the sound signal with the burst noise detection method provided in Embodiment 1, for each frame of spectral information in which burst noise is detected, identify it as the burst noise corresponding to the frame of spectral information. Noise suppression processing is performed on amplitude spectra corresponding to all frequency points between the first frequency point and the second frequency point of the frequency band.

[0115]Specifically, for each frame of spectrum information, if it is detected that there is no burst noise, the sound signal will not be processed; if it is detected that there is burst noise, then the searched group or more than one group satisfy kup-kdn<Mk The kup and kdn are processed. In the present embodiment, the noise suppression processing provides a sma...

Embodiment 3

[0123] Based on the burst noise detection device provided in Embodiment 1 and the burst noise suppression device provided in Embodiment 2, this embodiment provides a burst noise processing system.

[0124] Such as Image 6 As shown, the burst noise processing system provided in this embodiment includes: the burst noise detection device 10 provided in Embodiment 1 and the burst noise suppression device 20 provided in Embodiment 2, the burst noise suppression device 20 includes a first processing unit 201 .

[0125] In this embodiment, the burst noise processing system further includes a first transformation unit 30 adapted to perform discrete Fourier transform on the input time-domain sound signal to obtain frame-by-frame spectrum information of the sound signal.

[0126] The processing system of the burst noise also includes a second processing unit 40, adapted to use the phase spectrum of the sound signal before the burst noise suppression processing as the phase spectrum of...

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Abstract

The invention relates to a burst noise processing system and a burst noise detection and suppression method and device. The burst noise detection method comprises the following steps: calculating frequency spectrum gradient corresponding to each frequency point according to amplitude spectra of the adjacent frequency points in frame-by-frame frequency spectral information of sound signals; determining gradient threshold upper and lower limits based on the frequency spectrum gradient; determining amplitude spectral gradient marks of the frequency points according to the frequency spectral gradient and the gradient threshold upper and lower limits, wherein the amplitude spectral gradient marks comprise a first gradient mark and a second gradient mark; alternatively searching out a first frequency point corresponding to the amplitude spectral gradient mark of the first gradient mark and a second frequency point corresponding to the amplitude spectral gradient mark of the second gradient mark as a group of frequency points; judging that the first frequency point and the second frequency point in the group of the frequency points are a frequency band corresponding to the burst noise if the difference between the second frequency point and the first frequency point in at least one group of the frequency points is smaller than the preset burst noise maximum frequency band. By adopting the scheme, the specific burst noise in a background environment can be effectively detected and suppressed.

Description

technical field [0001] The invention relates to the field of audio processing, in particular to a sudden noise processing system, a method and a device for detecting and suppressing sudden noise. Background technique [0002] Mobile terminals (such as mobile phones) are often used in noisy environments, and the surrounding noise will greatly interfere with normal voice communication, resulting in reduced voice intelligibility and voice quality, which is not conducive to the comfort of voice communication; at the same time, when recording sound signals, Noise interferes with the desired target sound signal. Therefore, reducing the noise in noisy speech can improve the comfort of speech communication and improve the quality of recorded sound signals. [0003] Common mobile terminal devices use one or more microphones for voice noise reduction processing, that is, single-channel and multi-channel voice noise reduction technology; single-channel voice noise reduction technology...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L21/0232H04M1/19
Inventor 蒋斌吴晟林福辉徐晶明李慧文
Owner SPREADTRUM COMM (SHANGHAI) CO LTD
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