FIELD: acoustics; devices for echo cancellation.
SUBSTANCE: echo canceller for suppressing an echo generated when a voice output from a speaker enters a microphone, comprising a level control unit provided in a received signal path for transmitting a received signal from a far end to a speaker; an echo removal unit provided in the transmission path for transmitting a signal input from the microphone, the echo removal unit removing residual echo from the captured audio signal output from the microphone; and a double talk detection unit that detects whether the signals are in a double talk state in which the signals are simultaneously transmitted to the transmitted signal path and the received signal path. The level adjusting unit includes a compressor that performs a compression process on a signal exceeding a first threshold among the received signals if the double talk detection unit determines a double talk state.
EFFECT: reduction of non-linear echoes, reduction of uncompensated echoes and improvement of the quality of conversational speech.
9 cl, 8 dwg
