| 摘要 |
<P>PROBLEM TO BE SOLVED: To realize a sound volume control unit with which necessary and sufficient sound volume control is possible even when a volume less than a required dynamic range is used. <P>SOLUTION: Four kinds of waveform data wave varying in waveform levels (waveform amplitude) are previously provided by making the data correspondent to the change width of a sound volume parameter vol and the sound volume control is performed by selecting any of the waveform data wave 1 to 4 according to the value of the sound volume parameter vol determined by multiplication of a velocity KVel and user set part volume PVol [0] for every key touch, and setting the the selected waveform data wave and the sound volume control value vol (register vol) obtained by scale conversion of the sound volume parameter vol corresponding thereto, and therefore, the necessary and sufficient sound volume control can be performed even when the volume less than the required dynamic range is used. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
