Title:
METHOD AND DEVICE FOR NOISE SUPPRESSION, NOISE SUPPRESSING PROGRAM, AND ITS PROGRAM RECORDING MEDIUM
Document Type and Number:
Japanese Patent JP3831220
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To further process output signals y1, yN, etc., separated by a frequency range blind sound source separating method to which independent component analysis (ICA) is applied and to suppress noise based upon their reverberation components.
SOLUTION: Noise-supressed yi(t) is obtained (S6) by finding each delay τij maximizing the cross-correlation between yi(ω,t) and each of other yj(ω,t-τ) (i=1 to N and j=1 to N except j≠1) (S2), giving the delays τij to respective yi(ω,t) (S3), finding coefficients αij(ω) of noise components included in yi(t) from the product of the correlation between the delayed signals and yj(t-τij) and yi(t) and the ratio of respective totals (S4), multiplying and adding αij corresponding to respective yj(ω,t-τij) and finding noise /yi(c)(ω,t) for yi(t,ω) (S5), and subtracting /yi(c)(ω,t) from yi(ω,t).
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Inventors:
Ryo Mukai
Akiko Araki
Hiroshi Sawada
Shoji Makino
Akiko Araki
Hiroshi Sawada
Shoji Makino
Application Number:
JP2001291277A
Publication Date:
October 11, 2006
Filing Date:
September 25, 2001
Export Citation:
Assignee:
Nippon Telegraph and Telephone Corporation
International Classes:
G10L15/20; G10L15/28; G10L15/22; G10L21/0208; G10L21/028; (IPC1-7): G10L15/28; G10L15/20; G10L21/02
Domestic Patent References:
| JP2001051689A | ||||
| JP2000000407A | ||||
| JP2002530922A |
Foreign References:
| WO2000030264A1 |
Attorney, Agent or Firm:
Naoki Nakao
Taku Kusano
Yukio Nakamura
Minoru Inagaki
Taku Kusano
Yukio Nakamura
Minoru Inagaki
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