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Title:
NOISE REDUCTION SYSTEM AND NOISE REDUCTION METHOD
Document Type and Number:
Japanese Patent JP2007147732
Kind Code:
A
Abstract:

To attain excellent noise suppressing capability in a non-coherent noise field.

Upon receiving a signal in which the deviation of arrival time of a target sound signal included in an observation signal which is output from microphones 111-1 to 111-M is calibrated, a blocking matrix (BM) unit 14 generates a noise reference signal with the target sound signal suppressed, for the observation signal which is output from the remaining microphones other than the microphone 111-1 as a reference channel. A filter unit 15 corrects distortions of the frequency spectrum of the noise reference signal generated by the BM unit 14, by using a noise canceler coefficient for reflecting relation between cross-correlation of the frequency spectrum of the noise reference signal and the frequency spectrum of the sound reference signal defined using a coherence function, and autocorrelation of the frequency spectrum of the noise reference signal.


Inventors:
AKAGI MASATO
LI JUNFENG
Application Number:
JP2005000338727
Publication Date:
June 14, 2007
Filing Date:
November 24, 2005
Export Citation:
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Assignee:
JAPAN ADV INST SCIENCE & TECH
International Classes:
G10L15/20; G10L15/28; H04R1/40; H04R3/00
Attorney, Agent or Firm:
鈴江 武彦
河野 哲
中村 誠
蔵田 昌俊
峰 隆司
福原 淑弘
村松 貞男
橋本 良郎