Patent ID: 7269291

Claim:
A sub-band coding apparatus which divides an input one-dimensional signal into a plurality of regions to obtain a plurality of regional signals and which performs a sub-band coding relative to each of the plurality of regional signals, the sub-band coding apparatus comprising: a plurality of memories corresponding to the plurality of regions and respectively storing the plurality of regional signals as a central signal along with leading and trailing copy signals, said leading and trailing copy signals comprising copied portions from a leading or trailing portion of an adjacent stored one of the plurality of regional signals or inverted leading or trailing portions from the regional signal being stored; and a plurality of sub-band dividing filter banks corresponding to and connected to the plurality of memories and configured to perform sub-band division relative to each of the plurality of regional signals, wherein each of the plurality of sub-band dividing filter banks includes a sub-band dividing filter configured to divide an input signal received from a corresponding one of the plurality of memories into a plurality of sub-band signals and a down sampler configured to perform a down sampling relative to each of the plurality of sub-band signals divided respectively by the plurality of sub-band dividing filter banks.