| 摘要 |
<P>PROBLEM TO BE SOLVED: To avoid generation of a failure such as sound cut by realizing high speed processing of music generation by reducing frequencies of multiplication processing in the case of performing noise reduction and volume control. <P>SOLUTION: A noise gate closing interpolation means 82 sets a multiplication coefficient of a multiplier 87 to waveform data to be inputted so that it varies to the minimum value 0 as interpolating it when amplitude of the waveform data is equal to or less than a predetermined threshold level and a volume up/noise gate opening common interpolation means 84 sets the multiplication coefficient of the multiplier 87 to the waveform data to be inputted so that it varies to the maximum value 1 as interpolating it when the amplitude of the waveform data exceeds the threshold level. A volume down interpolation means 83 and the volume up/noise gate opening common interpolation means 84 set the multiplication coefficient of the multiplier 87 to the amplitude of the waveform data to be inputted so that it varies to a target value as interpolating it, respectively. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
