ECHO PROCESSING PROCESSOR AND VOICE COMMUNICATION APPARATUS

摘要

PROBLEM TO BE SOLVED: To reduce the lowering of echo cancellation effect which is caused when a user drops a sound volume in a voice communication apparatus and an echo processing processor in which echo processing is performed following an adjustment of the sound volume by a user. SOLUTION: The echo processing processor 101 comprises: reference signal selection means for selecting any of a received input signal or a variable amplified output signal yielded by adjusting a signal level of the received input signal based on a volume adjusting value of an output voice as a reference signal of an echo mixed into a transmitting input signal in an output voice yielded by outputting the received input signal into a listening space; and echo cancellation means for eliminating the echo from the transmitted input signal based on a transfer function of an echo path and any of the received input signal or the variable amplification output signal selected by the reference signal selection means. COPYRIGHT: (C)2008,JPO&INPIT