| 摘要 |
An audio encoding apparatus and an audio encoding method, wherein the processing amount can be reduced and a block length can be appropriately selected. An power calculation unit 402 calculates, from the input signal, a power fluctuation ratio. A predicted gain variation ratio calculation unit 406 calculates, from the input signal, prediction gain fluctuation ratio, whether an encoding using a long block is to be executed or an encoding using a short block is to be executed. Based on this determination, a long block MDCT transform unit 409 or a short block MDCT transform unit 410 performs a discrete cosine transformation of the input signal.
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