| 摘要 |
PURPOSE:To attain the effective utilization of a line and the reproduction of voice with excellent naturality by sending a voice signal while taking the presence of a voice period and a silence period with background noise into account. CONSTITUTION:A voice/silence decision means 2 decides whether a signal is in the voice part or the silence part for each frame, the voice frame is outputted to a voice coding means 3 and the noise frame decided to the silence part is outputted to a buffer means 4 respectively. The voice coding means 3 adds identification information to the voice frame, the buffer means upon the storage of a prescribed number T of noise frame, transfers them to a noise coding means 5, where k-set of code blocks are generated and the identification information is added. The voice and noise coding blocks obtained by the voice coding means 3 and the noise coding means 5 are sent. Thus, not only the information at the voice frame but also the information of background noise in the silence frame are sent from the sender side. Thus, natural reproduced voice having almost no change in the background noise depending on the voice and silence periods is obtained at the receiver side. |
