| 摘要 |
An input speech signal for each analysis frame converted into a first frequency sampled data is filtered by a digital filter having a high cut-off frequency lower than the highest frequency of the speech signal. After converting the filtered data into a second frequency (lower than the first frequency) sampled data, multipulses, representative of an exciting source information of the input speech, are developed from the second frequency sampled data. The analysis frame is divided into a plurality of subframes. At most one multi-pulse is developed in one subframe and the other multi-pulses are subsequently developed for the subframes other than the subframe where the one multi-pulse has been developed.
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