| 摘要 |
PROBLEM TO BE SOLVED: To quicken convergence of a filter coefficient being determined without using a conversion region echo simulation filter coefficient restricting means requiring a large operational amount including inverse linear transform, windowing, and linear transform processing. SOLUTION: The echo canceler comprises a means for obtaining a reproduction signal sequence by storing sound reproduction signals for a predetermined time, a means for obtaining a sound collection signal sequence by storing sound collection signals for a predetermined time, a means for obtaining a reproduction signal conversion sequence by performing linear conversion on the reproduction signal sequence, a means for generating a simulation echo signal conversion sequence simulating the linear conversion sequence of an echo signal leaking from the sound signal reproducing means to the sound signal collecting means by receiving the reproduction signal conversion sequence, a means for receiving the simulation echo signal conversion sequence and the sound collection signal sequence and outputting the simulation difference of the simulation echo signal conversion sequence, and a means for generating an updated sequence of a conversion region echo simulation filter coefficient having any one or both of a means for providing nonlinear processing to a reproduction signal conversion sequence being fed to a conversion region echo simulation filter coefficient updating means and a simulation error nonlinear processing means for providing nonlinear processing to a simulation error. COPYRIGHT: (C)2004,JPO&NCIPI
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