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1. 发明授权

US5136577A Sub-band acoustic echo canceller 失效
标题翻译：子带声音ECHO CANCELLER
公开(公告)号：US5136577A
公开(公告)日：1992-08-04
申请号：US658180
申请日：1991-02-20
申请人： Fumio Amano , Hector M. P. Meana
发明人： Fumio Amano , Hector M. P. Meana
IPC分类号： H04B3/21 , H04M9/08
CPC分类号： H04M9/082 , H04B3/21
摘要： A sub-band acoustic echo canceller includes a first division and decimation process part for dividing a reception signal from a line into first band signals of N channels and for decimating each of the first band signals to output decimated first band signals in a form of complex signals, where N is an integer greater than or equal to two, a second division and decimation process part for dividing a transmission signal into second band signals of N channels and for decimating each of the second band signals to output decimated second band signals in a form of complex signals, an echo canceller group made up of a group of echo cancellers for generating a pseudo echo in each band based on a corresponding one of the decimated first band signals received from the first division and decimation process part by referring to a corresponding one of the decimated second band signals received from the second division and decimation process part and for outputting a residual signal in each band by subtracting the pseudo echo of one band from the decimated second band signal of the same band, and an interpolation and synthesis process part for subjecting the residual signals received from the echo canceller group to interpolation and synthesis to output a synthesized residual signal which is transmitted to a line as the transmission signal, where the echo canceller group carries out an echo cancelling operation for each band in a complex signal region.

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