The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 12, 2011
Filed:
Jul. 05, 2007
Toru Hirai, Shizuoka, JP;
Mikio Tohyama, Tokyo, JP;
Hiraku Okumura, Shizuoka, JP;
Yoshikazu Honji, Shizuoka, JP;
Hiroshi Iriyama, Shizuoka, JP;
Koji Niimi, Shizuoka, JP;
Toru Hirai, Shizuoka, JP;
Mikio Tohyama, Tokyo, JP;
Hiraku Okumura, Shizuoka, JP;
Yoshikazu Honji, Shizuoka, JP;
Hiroshi Iriyama, Shizuoka, JP;
Koji Niimi, Shizuoka, JP;
Yamaha Corporation, Hamamatsu-shi, JP;
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 (-to-) 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.