Title:
MULTI-CHANNEL ECHO CANCEL METHOD, MULTI-CHANNEL SOUND TRANSFER METHOD, STEREO ECHO CANCELLER, STEREO SOUND TRANSMISSION APPARATUS, AND TRANSFER FUNCTION CALCULATION APPARATUS
Document Type and Number:
Japanese Patent JP3506138
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To solve the problem of an indefinite coefficient in the echo cancel technique of a multichannel sound signal.
SOLUTION: Stereo sound signals are reproduced directly from loudspeakers SP(L) and SP(R). By using a sum signal and a difference signal of the stereo sound signal as a reference signal and according to a cross spectrum calculation of the reference signal with a microphone-collected sound signal, calculation is performed to obtain the transfer functions of four sound transfer systems between the loudspeakers SP(L), SP(R) and microphones MC(L), MC(R). The transfer functions obtained are subjected to inverse Fourier transformation to obtain impulse response, which are set in filter means 40-1 to 40-4 to create echo cancel signals and perform echo canceling.
Inventors:
Toru Hirai
Kei Okumura
Mikio Higashiyama
Yuwa Honchi
Iriyama
Koji Niimi
Kei Okumura
Mikio Higashiyama
Yuwa Honchi
Iriyama
Koji Niimi
Application Number:
JP2002179722A
Publication Date:
March 15, 2004
Filing Date:
June 20, 2002
Export Citation:
Assignee:
Yamaha Corporation
International Classes:
H04B3/23; H04M3/56; H04M9/08; H04R3/02; (IPC1-7): H04B3/23; H04M3/56; H04R3/02
Other References:
【文献】国際公開01/01571(WO,A1)
Attorney, Agent or Firm:
Kunihiko Kato