| http://www.w3.org/ns/prov#value | - A sub-band acoustic echo canceller comprising:first division and decimation process means for dividing a reception signal from a line into first band signals of N channels and for decimating each of the first band signals to output decimated first band signals in a form of complex signals, where N is an integer greater than or equal to two; second division and decimation process means for dividing
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