Patent ID: 8433059
Filing Date: 2013-04-30
Classification: H04M

Abstract:
1. An echo canceller comprising: a pseudo echo generator including an adaptive filter for generating a pseudo echo signal on a basis of a received voice signal; an echo canceling circuit for subtracting the pseudo echo signal from a sending voice signal to thereby remove the echo signal from the sending voice signal; an initial delay estimator for producing a reference signal containing an identified frequency component masked by means of a frequency masking effect to output the reference signal to an echo path, and detecting, from the sending voice signal, an echo component of the identified frequency component derived from the reference signal to find an initial delay amount on the echo path on the basis of a producing timing of the reference signal containing the identified frequency component and a detection timing of the echo component in the identified frequency component in the sending voice signal; and a delay circuit for delaying the received voice signal by the initial delay amount on the echo path to supply a resulting signal to said pseudo echo generator.