| 摘要 |
The invention aims to provide an echo canceler capable of detecting the misadaptation at an early stage and correcting it, thereby preventing echo and howling even when receiving a periodical signal and a fan noise. It is an echo canceler 108 of a phone terminal having a line connector for connecting to a network, a speaker for supplying voice received from a far-end speaker, and a microphone for receiving voice of a close-end speaker, which comprises a filter 204 for eliminating the echo component reflected back from the speaker to the microphone, a transfer function estimating unit 202 for estimating a transfer function of the echo component, a coefficient judging unit 205 for judging a coefficient value of the filter 204, and a coefficient updating unit 203 for updating the coefficient value of the filter 204, based on the estimation result in the transfer function estimating unit 202 and the judgment result in the coefficient judging unit 205.
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