| 摘要 |
<p>An adaptive echo canceller for suppressing an echo in an input signal by a pseudo echo, includes a pseudo echo generation filter (11) having a predicted impulse response sequence of an echo path as filter coefficients thereof for generating a pseudo echo, a coefficient renewal part (12, 4A) for adaptively renewing the filter coefficients of the pseudo echo generation filter, and a part for suppressing an echo by the pseudo echo which is generated by the pseudo echo generation filter. The coefficient renewal part includes a part (48) for dividing renewed filter coefficients into a plurality of groups each having a certain number of renewed filter coefficients, and a part (48, 491, 492, 47) for successively selecting one group with a predetermined period and carrying out a correction process with respect to the renewed filter coefficients within the selected group, where the correction process corrects an accumulation of errors of renewal processes.</p> |
