| 摘要 |
PURPOSE:To attain the amplitude control of a digital signal without converting the digital signal by disusing an element disadvantageous in cost such as a conventional multiplier and constituting the titled circuit realizing the same function with a simple constitution. CONSTITUTION:The circuit is constituted that an output from an A/D converter is inputted with bit shift, an output of an ROM15 to which a binary code for setting attenuation is applied as its address is inputted, and a multiplicating processing by binary operation is executed at a multiplier circuit 12. Thus, the constitution of the multiplier circuit 12 is simplified and the amplitude control of the digitized signal is processed on real time without converting the digital signal. |
