| 摘要 |
PROBLEM TO BE SOLVED: To obtain excellent sound quality for voices from more than one speaker and musical sound signals generated by more than one musical instrument by calculating a sound source signal after finding delays from input signals. SOLUTION: A spectrum parameter calculating circuit 200 performs calculation in predetermined degree of a spectrum parameter by providing a window which is longer than subframe length for a voice signal of at least one subframe and segmenting a voice. A pitch extracting circuit 390 finds delays and gains corresponding to a pitch cycle by using the output of an auditory weighting circuit 230. Then a sound source quantizing circuit 350 performs vector quantization for a sound source signal by using a sound source code book 351. The output of a subtracter 236 and the output of an impulse response calculating circuit 310 are used to retrieve a sound source code vector cj (n) from the sound source code book 351. Further, the index of the selected sound source vector is outputted to a multiplexer 400. |
