| 摘要 |
A subtractor subtracts an echo canceling signal (C.y 1 (n-1)) from a canceling error signal (e(n)) to estimate the resonant noise (d(n)) to be silenced at a position of a microphone, and outputs a first basic signal (x 1 (n)) representing the estimated resonant noise d(n) as an input signal supplied to a controller. In the controller, a delay filter generates a second basic signal (x'(n)) by delaying the first basic signal (x 1 (n)) by a time value (Z<SUP>-n</SUP>) The controller generates a control signal (x(n)) based on the first basic signal (x(n)) and the second basic signal (x'(n)).
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