ECHO SIGNAL ERASING DEVICE

摘要

PURPOSE:To expand the range of application by allowing an attenuation controller to give an echo signal cancelling amount suitable for surrounding noises while using S/N estimated from power for a short time and increasing the attenuation of an attenuator of an estimated band. CONSTITUTION:Echo cancellers 341-34n estimate an echo signal included in each bans signal of the 1st band splitter 32 based on each band signal of the 1st band splitter 32 and each band signal of the same band of the 2nd band splitte 33 and obtain each band signal erasing an echo signal by subtracting each estimated band signal of the echo signal from each band signal of the 1st band splitter 32. On the other hand, short-time power calculation devices 371-37n calculate a short-time power pj of a band signal xj at a time (j) obtained from the 1st band splitter 32 according to an equation I. An attenuation controller 38 controls the attenuation of the attenuators 351-35n based on the short-time power of each band signal obtained by the equation I.