| 摘要 |
PURPOSE: To generate a decoded voice source signal with excellent continuity and to obtain the decoded voice source signal with high quality by providing a voice source shaping part weighting and adding a representative voice source of a decoded frame and an impulse signal. CONSTITUTION: The voice source shaping part 25 being a voice source shaping means is provided in a decoding part 120, and the impulse signal is weighted and added to the representative voice source S20, and the representative voice source S20 is shaped. Since the waveform shape of the shaped representative voice source S26 shaped by the shaping approaches to an impulse always, even when that is repeated in a representative voice source repeat part 21, the decoded voice source signal S22 with a smooth change is generated. Since the representative voice source S20 is shaped so as to approach to the impulse by the voice source shaping part 25 in such a manner, the decoded voice source signal with the smooth change between frames is obtained. Further, since the shaping is performed so as to approach to the impulse further when a change of an input voice signal is large, the decoded voice source signal following up even large change is obtained. |
