Echo cancelling device, communication device, and echo cancelling method having the error signal generating circuit

摘要

Provided is an echo canceller capable of realizing an excellent echo cancellation performance even in a double talk state. An echo canceller (10) comprises: an adaptive filter (20); a subtractor (30); and an error signal generating circuit (40). The adaptive filter (20) synthesizes a spurious echo signal (y′(k)) from a receiving signal (x(k)) before being delivered from a speaker (3). The subtractor (30) subtracts the spurious echo signal (y′(k)) from an input signal (yin(k)) received by a microphone (2) so as to generate an echo cancellation signal (p(k)) The error signal generating circuit (40) generates an error signal (s(k−1)) by removing a spurious voice signal (r(k−1)) corresponding to a voice signal (v(k)) of a talker from the echo cancellation signal (p(k)). The adaptive filter (20) updates a characteristic of the adaptive filter (20) so that an amplitude of the error signal (s(k−1)) becomes smaller.