| 摘要 |
Spectral or pitch parameters of speech signal are quantized, and impulse responses thereof are predicted by using a filter constituted thereby. Orthogonal transform of the speech signal or a signal derived therefrom or the impulse responses or signals derived therefrom is made, and the result is entirely or partly quantized to obtain a plurality of pulses. More preferably, these pulses are retrieved recurrently by also using codevectors retrieved from a codebook or collectively quantizing their senses or amplitudes. Optimization is made in this way. <IMAGE> |
