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Title:
INSTANTANEOUS DIRECT/INDIRECT RATIO ESTIMATION DEVICE, NOISE ELIMINATION DEVICE, FAR/NEAR DETERMINATION DEVICE, SOUND SOURCE DISTANCE MEASUREMENT DEVICE, METHOD FOR EACH DEVICE, AND PROGRAM FOR DEVICE
Document Type and Number:
Japanese Patent JP2011259397
Kind Code:
A
Abstract:

To accurately estimate a direct/indirect ratio of sounds from moving sound sources.

A microphone array comprises plural microphones provided at positions where small microphone arrays each comprising a few microphones overlap one another by parallel translation. A spatial correlation matrix calculation unit calculates a small space correlation matrix by adding or averaging spatial correlation matrices calculated for the small microphone arrays respectively by using received sound signals converted in a frequency domain. Then, an eigenvalue expansion unit performs eigenvalue expansion for the small space correlation matrix to generate eigenvalues and eigenvectors and outputs the eigenvalues. An eigenvalue distribution calculation unit quantifies the rate of the distribution of the eigenvalues to output a value equivalent to a direct/indirect ratio.


Inventors:
HIOKA YUSUKE
SAKAUCHI SUMITAKA
FURUYA KENICHI
HANEDA YOICHI
NIWA KENTA
Application Number:
JP2010134494A
Publication Date:
December 22, 2011
Filing Date:
June 11, 2010
Export Citation:
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Assignee:
NIPPON TELEGRAPH & TELEPHONE
International Classes:
H04R3/00; G10L21/0216; H04R1/40
Domestic Patent References:
JP2010103617A2010-05-06
JP2009036810A2009-02-19
JP2008079256A2008-04-03
JP2001166025A2001-06-22
Attorney, Agent or Firm:
Naoki Nakao
Yukio Nakamura
Yoshimura Munehiro
Taku Kusano



 
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