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Transient noise suppression method based on spectrum estimation

A transient noise and noise suppression technology, applied in voice analysis, instruments, etc., can solve problems such as hearing fatigue, affecting voice quality, and voice systems not working properly

Active Publication Date: 2013-12-18
DALIAN UNIV OF TECH
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Problems solved by technology

The existence of transient noise seriously affects the voice quality, reduces the clarity and intelligibility of the voice signal, causes auditory fatigue, and even makes the voice system unable to work normally

Method used

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  • Transient noise suppression method based on spectrum estimation
  • Transient noise suppression method based on spectrum estimation
  • Transient noise suppression method based on spectrum estimation

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Embodiment Construction

[0020] The present invention will be further described below in conjunction with accompanying drawing:

[0021] Transient Noise Suppression Method Based on Optimal Modified Log Spectral Amplitude Estimation (OM-LSA)

[0022] In order to realize speech noise suppression under low signal-to-noise ratio and non-stationary background noise, Cohen et al. proposed a transient noise suppression method based on Optimal Modified Log Spectral Amplitude Estimation (OM-LSA). This method has good robustness in low signal-to-noise ratio and non-stationary noise environment. The idea is to obtain the optimal spectral gain function of the observed signal through the prior signal-to-noise ratio estimation, noise estimation, and speech existence probability estimation of the observed signal, and finally multiply the frequency-domain observed signal with the gain function to obtain the denoised speech Signal. The functional block diagram based on the optimal modified log spectrum amplitude est...

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Abstract

The invention discloses a transient noise suppression method based on spectrum estimation and belongs to the technical field of digital signal processing. The method includes the following steps of firstly, conducting non-transient background noise power spectrum estimation based on modified minima controlled recursive averaging; secondly, conducting transient noise power spectrum estimation based on the modified minima controller recursive averaging and the optimally modified log spectral amplitude estimator; thirdly, conducting voice noise suppression based on the optimally modified log spectral amplitude estimator and the transient noise spectrum estimation.

Description

technical field [0001] The invention relates to a transient noise suppression method based on spectrum estimation, which belongs to the technical field of digital signal processing. Background technique [0002] Transient noise (also called transient noise) in speech is a kind of additive noise. Usually, transient noise has the characteristics of suddenness and impulsiveness in the time domain, and its energy is often concentrated in a short time domain interval, while its distribution is wider in the frequency domain. A typical transient signal is often composed of an initial peak and a short-term oscillation process with a duration of about 10-50ms attenuation, such as knocking on the door, mouse click, metronome, keyboard tapping, hammer hitting, etc. transient noise. Transient noise exists in many occasions, such as voice communication equipment such as hearing aids, hands-free components, mobile phones, and video conference terminals. The existence of transient noise...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L21/0216
Inventor 陈喆殷福亮张兆伟
Owner DALIAN UNIV OF TECH
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