| 摘要 |
PROBLEM TO BE SOLVED: To reduce distortion in voice and sufficiently remove noise. SOLUTION: A voice/non-voice identifying part 106 judges a part to be a sound part comprising a voice component when a difference between a voice spectrum signal and a noise base value is equal to or more than a prescribed threshold and judges the part to be a silence part comprising not the voice component but only noise. A comb filter generating part 107 generates a comb filter for emphasizing a voice pitch based on the existence of the voice component in each frequency component. An attenuation coefficient calculating part 108 multiplies the delay coefficient based on a frequency characteristic in the comb filter, sets the attenuation coefficient of an input signal at each frequency component and outputs the attenuation coefficient of each frequency component to a multiplying part 109. The multiplying part 109 multiplies a voice spectrum by the attenuation coefficient by frequency component unit. A frequency synthesizing part 110 synthesizes the spectrum by frequency component unit, which is obtained as the result of multiplication, with the continuous voice spectrum in a frequency area by prescribed processing time unit. |
