| 摘要 |
PURPOSE: To attain circuit integration and to reduce the power consumption by realizing a digital filter circuit used for an ADM system voice CODEC or the like. CONSTITUTION: The filter circuit is provided with a switch 5 selecting either one of two different values, a delay circuit 3 outputting an input signal with a prescribed time of delay, a 1st adder 4 inverting an output sign of the delay circuit 3 and adding the inverted output value and the selected value by the switch 5, a multiplier 6 multiplying a prescribed constant with an output of the 1st adder 4, and a 2nd adder 7 adding an output of the multiplier 6 and an output of the delay circuit 3, and an output of the 2nd adder is fed back to the delay circuit 3. |
