| 摘要 |
PURPOSE:To reproduce not only a voiced sound but also a voiceless sound with high quality by varying the number of encoding bit allocations in accordance with a result of a voiced/voiceless decision and encoding an output voice waveform of a time base compressing means. CONSTITUTION:A transmitting part decides voiced/voiceless of an input voice waveform in some short time by a voiced/voiceless deciding means 5, compresses this input voice waveform on a time base only at the time of being voiced, and also, varies the number of encoding bit allocations in accordance with the time when the input voice waveform is voiced and voiceless, and encodes compression and non-compression voice waveforms. Subsequently, a receiving part, decodes the encoded voice waveform in accordance with the number of encoding bit allocations, and also, extends this decoded voice waveform on the time base only when the input voice waveform is a voice. In such a way, a waveform of a voiceless sound having no periodicity is not broken down, and also, by holding a prescribed encoding bit ratio, voice time base compression encoding can be executed. |
