Microphone array postfiltering sound enhancement method based on multi-models and hearing characteristic

A microphone array, speech enhancement technology, applied in speech analysis, frequency/direction characteristic devices, transducer circuits, etc., can solve problems such as performance degradation
CN101778322AActive Publication Date: 2010-07-14INST OF AUTOMATION CHINESE ACAD OF SCI
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Patent Information

Authority / Receiving Office
CN ยท China
Current Assignee / Owner
INST OF AUTOMATION CHINESE ACAD OF SCI
Publication Date
2010-07-14

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Abstract

The invention discloses a microphone array postfiltering sound enhancement method based on multi-models and hearing characteristic, aiming at two important factors influencing the postfiltering sound enhancement performance of a microphone array, i.e. accurate estimation for signal parameters and suitable compromise between increasing noise reduction performance and reducing voice distortion. Thescheme of the invention comprises the following steps of carrying out time domain alignment on signals collected by the microphone array, and carrying out short-time Fourier transform and characteristic value analysis based of power spectrum; determining the dimensionality of a signal subspace through the existence probability of target voice signal in maximation noise-carried voice signals; self-adaptively selecting a distribution model of a noise power spectrum in the noise-carried voice signals; estimating noise power spectrum by utilizing a conditional probability; estimating an auditory masking threshold value based on the signal subspace; and estimating a postfilter by combining Lagrange multipliers according to the auditory sensing characteristics.
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Description

technical field

[0001] The invention relates to a signal subspace method of a microphone array, an auditory masking effect and the design of a post-filter. Background technique

[0002] Speech in real life is often affected by noise in the environment, and multi-channel speech enhancement methods have received extensive attention in recent years. The advantage of the microphone array speech enhancement method over the single-channel speech enhancement method is that it can use the correlation between multiple signals to more accurately estimate the characteristics of the signal, thereby achieving better speech enhancement effects. Among them, the microphone array post-filter speech enhancement method has been widely used in recent years because of its excellent noise reduction performance. Simmer et al. (Reference 1: K.Uwe Simmer, et al, "Post-filtering techniques", in Microphone Arrays, M. Brandstein and D. Ward, Eds. New York: Springer, ch.3, pp.36-60, 2001.) proved that...

Claims

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