| 摘要 |
PROBLEM TO BE SOLVED: To encode a speech signal with high quality at a bit rate designating the speech signal and encoding delay. SOLUTION: An encoding parameter control circuit 31 calculates a frame length from the bit rate and encoding delay and outputs the frame length to a CELP encoding circuit 32. The encoding parameter control circuit selects a control parameter according to the bit rate from a table where a plurality of control parameters for controlling the operation of the CELP encoding circuit on the basis of the calculated frame length are described. Further, the encoding parameter control circuit outputs a sub-frame length and the number of bits allocated to a multipulse signal to a multipulse forming parameter setting circuit 33. The multipulse encoding parameter circuit calculates the number of pulses indicating a multipulse excitation signal, the number of pulse candidate positions of the respective pulses and the candidate positions from the sub-frame length and the number of bits of the multipulse signal. COPYRIGHT: (C)2004,JPO&NCIPI
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