| 摘要 |
PURPOSE:To prevent the quality deterioration of an unvoiced sound by not applying a TDHS (time axis compression and expansion) processing to an unvoiced sound without any periodicity and passing the sound without any modification. CONSTITUTION:A discrimination means 2 in a voice signal coding means 100 discriminates whether a voice input signal SIN is a voiced sound or an unvoiced sound and outputs a voiced sound discrimination signal SJUDGE. In the case of a voiced sound, a pitch period of the voice input signal is detected and a pitch period signal SPITCH is outputted. A time axis compression means 1 in response to the discrimination signal passes the voice input signal in the case of the unvoiced sound and applies time axis compression processing the signal in the case of the voiced signal based on a synchronizing signal and uses a coding means 3 to encode it. A decoding means 6 of a voice signal reproduction means 300 decodes a received coding signal received via a transmission line 200. A time axis expanding means 7 in response to the voice/unvoiced discrimination signal outputs a decoded signal as it is in the case of the unvoiced signal and applies the time axis expansion processing to the signal in the case of the voiced signal based on the pitch period signal. |
