| 摘要 |
A sound recording and reproducing device codes a sound signal by a code excited linear predictive coding means including an adaptive code book created on the basis of past excitation signals, a stochastic code book having a plurality of different stochastic signals and a pulse code book having a plurality of pulse signals. When decoding the sound data coded frame by frame by code excited linear predictive coding, each frame comprising a plurality of sub-frames, by using an adaptive code book created on the basis of a past excitation signal, and a stochastic code book having a plurality of different stochastic signals, a switch controller controls switches such that the coded data in a predetermined sub-frame of each frame is skipped in accordance with the rate of change of reproduction speed to decode the coded data in the remaining sub-frame or sub-frames without decoding the coded data in the skipped sub-frame, and the contents of the adaptive code book are renewed.
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