| 摘要 |
A coding apparatus ( 500 ) includes: a fourth layer codebook that shows N number of (N is a natural number) codes indicating uniquely respective N integers that increment one by one; and first to third layer codebooks that show M number of (M is a natural number that satisfies M<N) codes indicating uniquely respective M integers that are a subset of the N integers, and codes a digital signal using any one of the first to fourth layer codebooks. Therefore, the coding apparatus ( 500 ) does not need to do rescaling to even when switching one of the first to fourth layer codebooks into another of them.
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