| 摘要 |
PURPOSE:To reduce the influence of disturbance and to easily attain LSI- implementation by adding musical tone data which are outputted, channel by channel, digitally and then performing D/A conversion. CONSTITUTION:Waveform data of respective channels are generated on a time- division basis at a 1st rate provided to each channel and waveform data is outputted at a 2nd rate which is smaller than the 1st rate. Then 1st and 2nd digital memories 2 and 3 are provided for the respective channels, waveform data is written in the 1st digital rate, and the contents of the 1st digital memory 2 are written in the 2nd digital memory 3 at a 2nd rate. Further, the contents of the 2nd digital memory are added, channel by channel, and then converted from digital to analog. Consequently, the influence of disturbance is reduced and an analog element like a capacitor, etc., is not used, so the LSI- implementation is attained. |
