System and method for reducing burst noise through wavelet trapped wave

A notch and noise technology, applied in the field of noise reduction, can solve the problems of high complexity of wavelet algorithm and audio processing that has not yet been seen, and achieve the effects of good voice environment, noise suppression, and low cost

Inactive Publication Date: 2011-09-07
蔡镇滨 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the complexity of the wavelet algorithm is very high, and there is no specific application for audio processing, especially noise cancellation.

Method used

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  • System and method for reducing burst noise through wavelet trapped wave
  • System and method for reducing burst noise through wavelet trapped wave
  • System and method for reducing burst noise through wavelet trapped wave

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Embodiment Construction

[0039] Below, the specific implementation of the present invention will be described in detail in conjunction with the accompanying drawings.

[0040] The idea of ​​the present invention is: after the notch filter eliminates the noise of a specific frequency, the audio curve of the voice signal will be partially missing, which will cause the intermittent and distorted voice in the morning, so it is impossible to achieve a satisfactory output effect. Wavelet analysis and processing can reconstruct the missing audio fragments and restore the original real voice signal.

[0041] figure 1 As shown, in a specific implementation manner, the hardware for implementing the present invention includes an audio acquisition module, a notch filter, a wavelet analysis and processing module, a bandpass filter and a gain module.

[0042] Wherein, the audio acquisition module collects the audio signal, and transmits the audio signal to the notch filter, and the audio acquisition module can be ...

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Abstract

The invention provides a system and method for reducing burst noise through wavelet trapped wave. The system comprises an audio acquisition module, a trap filter and a wavelet analysis processing module, wherein the audio acquisition module acquires an audio signal, and transmits the audio signal to the trap filter; the trap filter performs trapping processing on the audio signal, filters out power frequency interference, and transmits the audio signal to the wavelet analysis processing module; and the wavelet analysis processing module eliminates high-frequency noise in the audio signal, reconstructs the audio signal, and performs audio output. The system and the method combine the trap filter, can effectively inhibit noise, and restore real audio signals.

Description

technical field [0001] The present invention relates to a method for reducing noise, specifically a system and method for reducing noise by notch filter and wavelet transform analysis. Background technique [0002] In the process of audio collection by communication equipment, environmental noise is often included, and the environmental noise and the voice of a human call will overlap each other, affecting the quality of the call. [0003] In the current audio signal processing process, it is difficult to deal with these noises, because the frequency band of the human voice is within the frequency band of the environmental noise. To eliminate the noise, the human voice is often eliminated together. [0004] At present, a commonly used noise reduction method is to use a notch filter (notch filter for short) to perform noise reduction processing at a specific frequency, such as "notch filter" published in the fourth issue of "Automation and Instrumentation" magazine in 2004 T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L21/02G10L21/0208
Inventor 蔡镇滨马平
Owner 蔡镇滨
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