| 摘要 |
PROBLEM TO BE SOLVED: To allow satisfactory interpolation of a sound signal.SOLUTION: A distorted waveform generation unit 2 generates a distorted waveform by outputting a signal following up a waveform of an original signal supplied to an input terminal 1 in a period when the waveform of the original signal is inclined upward, and by outputting a signal not including a prescribed high frequency of frequencies of the original signal in a period when the waveform of the original signal is inclined downward. A harmonics extraction unit 3 extracts a signal in a prescribed frequency band from the distorted waveform generated by the distorted waveform generation unit 2, as harmonics of the original signal. An adder 5 adds the harmonics extracted by the harmonic extraction unit to the original sound to be supplied to the input terminal 1. |
