| 摘要 |
A coding parameter control circuit computes frame length from bit rate and coding delay, and provides the computed frame length data to a CELP coding circuit. On the basis of the computed frame length, the coding parameter control circuit selects control parameters from a table, in which a plurality of control parameters for controlling the operation of the CELP coding circuit are set, on the basis of the bit rate, and provides the selected control parameters to the CELP coding circuit. The coding parameter control circuit provides the sub-frame length, and bit number distributed to the mufti-pulse signal to the multi-pulse signal generation parameter setting circuit. The multi-pulse signal coding parameter setting circuit computes pulse number of multi-pulse excitation signal, pulse position candidate number of each pulse and position candidates thereof from the sub-frame length and bit number of multi-pulse signal.
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