| 摘要 |
PURPOSE:To change the reproducing speed of conversation voice signals, which are recorded, so as to make them sound more natural to human ears. CONSTITUTION:A voice/voiceless decision device 1 makes a voice/voiceless device and outputs the result to a sound duration rate detection device 2. The sound hour rate detection device 2 computes the voice hour rate based on the ratio between voice duration and voiceless duration frames and outputs it to a inference device 3. The inference device 3 decides a voiceless duration increase and decrease rate and a speed transformation ratio using a fuzzy inference. The voice signals are inputted to a voiceless duration processing device 4 during the voiceless duration and are inputted to a speed transformation processing device 5 during a voice duration by a switch 6 changeover operation which depends on the decision results of the voice/voiceless decision device 1. the voiceless duration processing device 4 cuts/adds a voiceless duration decided by the voiceless duration increase and decrease ratio given by the inference device 3, the speed transformation processing device 5 performs time axis companding by the speed transformation ratio given by the inference device 3 and voice is outputted through a switch 7. |
