MULTI-PATH ECHO ERASURE SYSTEM

摘要

PURPOSE:To attain multi-channel echo erasure by providing a private echo path characteristic parameter storage circuit at each echo path so as to obtain each echo characteristic parameter. CONSTITUTION:The correcting amount is calculated by using a correction amount calculation circuit 32 and a reception power calculation circuit 34 from a reception signal and a residual signal in order to obtain each echo characteristic to an echo signal of each channel. Then each echo characteristic parameter storage circuit 31 uses each correcting amount to obtain a sequential echo characteristic parameter at each channel and store its content. Further, a convolution integration circuit 33 applies convolution integration between an output signal of the storage circuit 31 and the output signal of a reception signal storage circuit 29 to obtain respectively an approximate echo signal. The approximate echo signal is used to erase the echo signal from a speaker 25 to a microphone 20. Thus, echo erasure of multi-channel is attained.