| 摘要 |
PROBLEM TO BE SOLVED: To provide a system that automatically reassigns an echo canceler to another facility in the case that it is decided that a facility to which the echo canceler has been assigned does not generate vast profit from echo cancelation. SOLUTION: The echo canceling system provided with self-deactivation processing of this invention includes an echo canceler and an echo detector employing an adaptive filter. The adaptive filter decodes an estimate value of an echo signal in existence in an unprocessed signal received from a near-end of a communication channel. The echo detector compares the energy of the unprocessed received signal with the energy of the received signal whose echo is canceled. When the difference is high, the echo canceler is left as active. The difference, that is, the estimated echo energy is small, the echo canceler is deactivated and the echo detector selects the unprocessed received signal as its output. In the case that a plurality of channels for echo cancelation is to be served, the deactivated echo canceler is reassigned to serve for another communication channel.
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