| 摘要 |
PROBLEM TO BE SOLVED: To reproduce a harmonics tone string near an original sound in the frequency band expanding processing of a sound signal. SOLUTION: A high-pass filter 3 takes out components of the harmonics tone string from an input sound signal and a frequency shifting part 4 performs frequency shifting of the components of the harmonics tone string. A cross correlation operation part 5 and a sinusoidal wave table 6 recursively perform cross correlation operation between the input sound signal and the output of the frequency shifting part 4 while changing an amount of the frequency shifting and decides an amount of the frequency shifting with which the result of the operation shows the maximum correlation. A frequency shifting part 7 shifts the frequency of the input sound signal by the decided amount of the frequency shifting and a high-pass filter 8 takes out components equal to or higher than a second specific frequency from the output of the frequency shifting part 7. An adder 12 adds the input sound signal and the output of the high-pass filter 8 whose level is adjusted in a level adjusting part 9. COPYRIGHT: (C)2005,JPO&NCIPI
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