Title:
MULTICHANNEL NOISE SUPPRESSOR, METHOD AND PROGRAM FOR MULTICHANNEL NOISE SUPPRESSION AND RECORDING MEDIUM FOR THE PROGRAM
Document Type and Number:
Japanese Patent JP3619461
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To suppress the occurrence of quality deterioration in a reproducing caused by sound image displacement and residual noise in the reproducing side while employing a conventional single channel noise suppressor to multichannels.
SOLUTION: In a computing section 60, a power ratio PXm/ΣPXm is computed where PXm is the power of input signals Xm(n) of a noise suppressing section 16-m (m=1, 2,...M) and ΣPXm is the sum of the power of input signals X1(n) to XM(n) of the all channels. Moreover, in a computing section 70, a power ratio PYm/ΣPYm is computed where PYm is the power of output signals Ym(n) of the section 16-m of each channel and ΣPYm is the sum of the power of output signals Y1(n) to YM(n) of the all channels. In a computing section 80, a correction gain Gm=(PXm/ΣPXm)/(PYm/ΣPYm) is computed based on the power ratio of a corresponding channel and noise suppressing section output signals Ym(n) of the corresponding channel is multiplied by the gain Gm.
Inventors:
Sumiu Sakauchi
Masashi Tanaka
Yoichi Haneda
Kazuhiko Yamamori
Masashi Tanaka
Yoichi Haneda
Kazuhiko Yamamori
Application Number:
JP2001032421A
Publication Date:
February 09, 2005
Filing Date:
February 08, 2001
Export Citation:
Assignee:
Nippon Telegraph and Telephone Corporation
International Classes:
H04R3/00; G10L21/0208; G10L21/0232; H04B3/04; H04B15/00; H04M1/60; H04Q3/42; (IPC1-7): H04B3/04; G10L21/02; H04M1/60; H04R3/00
Domestic Patent References:
| JP6268556A | ||||
| JP7240722A | ||||
| JP2002076997A |
Attorney, Agent or Firm:
Taku Kusano
Minoru Inagaki
Minoru Inagaki