(57) A coding parameter control circuit 31 computes frame length from bit rate and coding
delay, and provides the computed frame length data to a CELP coding circuit 32. On
the basis of the computed frame length, the coding parameter control circuit 32 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 race, 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 multi-pulse
signal to the multi-pulse signal generation parameter setting circuit 33. The multi-pulse
signal coding parameter setting circuit 33 computes pulse number of multi-pulse excitation
signal, pulse position candidates of each pulse and candidate positions thereof from
the sub-frame length and bit number of multi-pulse signal.
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