| 摘要 |
PROBLEM TO BE SOLVED: To reproduce a sound signal of high quality from an encoded bit sequence. SOLUTION: The postprocessing method of sound signal includes a stage where a sound signal is made to pass a linear filter 32 showing reverse characteristics of spectrum envelope, a stage where a peak position is detected from the signal passing the linear filter by a peak position detection part 33 and a waveform of one-pitch length is extracted by a signal waveform segmenting part 34, and a stage where peaks of mutual correlation are successively searched by a pitch reference position search part 35, and the signal which has passed the linear filter is divided into areas which correspond to the waveform of one-pitch length by a boundary area determination part 36. and a comb filter coefficient is calculated in a pitch correlation value calculation part 37, and the signal passing the linear filter in each area is made to pass a comb line filter 38 using this coefficient to obtain a sound signal output. |
