| 摘要 |
PURPOSE: A method for decoding an audio signal that has a base layer and an enhancement layer is provided to perform the decoding of encoded audio signals in a manner that saves power. CONSTITUTION: A decoder for decoding an audio signal that has a base layer signal portion and an enhancement layer signal portion, wherein the enhancement layer signal portion was predicted from the base layer signal portion using filter bank domain mapping, comprises: a partial decoder(41) for partially decoding the encoded base layer portion; a first mapper(45) for reversely mapping the enhancement layer portion according to a simplified reversal of the filter bank domain mapping; a first adder(42) for adding the reversely mapped enhancement layer portion to the partially decoded base layer portion; and a first synthesis filter(43) for synthesis filtering the output signal of said adding, wherein the first synthesis filter operates as inverse base layer filter bank.
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