Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

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

Active Publication Date: 2010-07-14
INST OF AUTOMATION CHINESE ACAD OF SCI
View PDF0 Cites 22 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the method is based on the assumption of the scattering noise field, when the noise field in the actual occasion does not conform to the scattering noise field, the performance of the method will drop significantly

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Microphone array postfiltering sound enhancement method based on multi-models and hearing characteristic
  • Microphone array postfiltering sound enhancement method based on multi-models and hearing characteristic
  • Microphone array postfiltering sound enhancement method based on multi-models and hearing characteristic

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0065] It should be understood that the following detailed description of the various examples and drawings is not intended to limit the invention to the particular illustrative embodiments; the described illustrative embodiments merely exemplify the various steps of the invention, the scope of which is defined by the appended claims to define.

[0066] The present invention uses the auditory masking effect of the human ear to propose a reasonable compromise solution, and designs a new post-filter based on auditory perception characteristics. The auditory masking effect of the human ear means that, under normal circumstances, the target speech signal signal is a strong signal, while the background noise is relatively weak, so the auditory system will determine the auditory masking threshold in the frequency domain according to the specific target speech signal signal, if If the filtered residual noise is limited below the auditory masking threshold of the human ear, then the n...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

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.

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): H04R1/20H04R3/00G10L21/02G10L21/0216
Inventor 刘文举程宁李超
Owner INST OF AUTOMATION CHINESE ACAD OF SCI
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com