| 摘要 |
PURPOSE: To precisely convert digital envelope data into an analog envelope signal by integrating output pulses of a tone generator which outputs the pulses of constant width in repetitive cycles corresponding to digital envelope data. CONSTITUTION: A digital envelope data generating means 1 outputs digital data representing the momentary value (n) of an envelope according to constant algorithm. The tone generator 2 outputs the pulses of constant width in cycles corresponding to the digital data representing the momentary value (n) and the output pulses of the tone generator 2 are integrated by an integrator 3. Consequently, the digital data on the envelope can correctly be converted into the analog envelope signal in spite of simple constitution using general circuit components. |
