Patent Document ID: 5566167
Application ID: 08368687
Patent Flag: 1

Claim One:
1. A subband echo canceler comprising: a first analysis filter bank including a predetermined number of first filters for establishing a predetermined number of subbands and for decomposing a received signal into a corresponding number of subband signals, each of the first filters having a predetermined first frequency passband; a second analysis filter bank including a predetermined number of second filters equal to the predetermined number of the first filters for establishing a corresponding number of subbands and for decomposing a transmit signal into the predetermined number of subband signals, each of the second filters having a predetermined second frequency passband which is narrower than the first frequency passband; a plurality of echo cancelers supplied with the subband signals from the first analysis filter and the subband signals from the second analysis filter for canceling echoes in the corresponding subbands and for generating a predetermined number of error signals equal to the predetermined number of subbands; and a synthesis filter bank supplied with the predetermined number of error signals for synthesizing an output signal.