PURPOSE: To reduce a process amount per one sample by executing any one process among respective adaptive FIR filter coefficient renewal processes as a coefficient renewal process performed in one sample.

CONSTITUTION: This device is provided with a coefficient renewal device 116 updating a coefficient of a first adaptive FIR filter 105, the coefficient renewal device 119 updating the coefficient of a second adaptive FIR filter 117 and the coefficient renewal device 123 updating the coefficient of a third adaptive FIR filter 121. A coefficient renewal switcher 124 switches the renewal process of the first adaptive FIR filter 105, the renewal process of the second adaptive FIR filter 117 and the renewal process of the third adaptive filter 121 at a prescribed ratio. Then, in the coefficient renewal process performed in one sample, any one process among respective coefficient renewal devices 116, 119, 123 is executed, and other two processes are stopped. Thus, the process amount per one sample is reduced, and real time operation is performed even when a system is made multi-channel.