Telephonic communications – Echo cancellation or suppression – Using digital signal processing
Reexamination Certificate
2011-04-12
2011-04-12
Briney, III, Walter F (Department: 2614)
Telephonic communications
Echo cancellation or suppression
Using digital signal processing
C379S406010, C379S286000
Reexamination Certificate
active
07925008
ABSTRACT:
Stereo sound signals are reproduced directly from loudspeakers (SP(L), SP(R)). By using a sum signal and a difference signal of the stereo sound signals 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 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 transform to obtain impulse responses, which are set in filter means (40-1to40-4) to create echo cancel signals and perform echo canceling. This solves the problem of an indefinite coefficient in the echo cancel technique of a multi-channel sound signal.
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Hirai Toru
Honji Yoshikazu
Iriyama Hiroshi
Niimi Koji
Okumura Hiraku
Briney III Walter F
Pillsbury Winthrop Shaw & Pittman LLP
Yamaha Corporation
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