| 摘要 |
<P>PROBLEM TO BE SOLVED: To generate a natural musical sound by restoring a lost higher- harmonic component even when a sound-recording sampling frequency is lowered and musical sound waveform data are generated. <P>SOLUTION: Musical sound waveform data corresponding to an address generated by an address generation part 23 among pieces of musical sound waveform data which are sampled at the sound-recording sampling frequency lower than an original sampling frequency and registered in a timbre data memory 25 are read out and interpolated by an interpolation part 26. The interpolated musical sound waveform data are multiplied by a sine wave for frequency (f) a half as high as the sound-recording sampling frequency and then shift in the positive direction by the frequency a half as high as the sound- recording sampling frequency. An HPF 29 cuts a frequency component below a half of the sound-recording sampling frequency and an addition part 31 adds the musical sound waveform data after the cutting and the musical sound waveform data after the interpolation together to approximately restore a frequency component lost in the sampling, thereby generating a more natural musical sound. <P>COPYRIGHT: (C)2003,JPO |
