| 摘要 |
PURPOSE:To eliminate deviation from a target value caused by the accumulation of an increased/decreased value corresponding to a rate and to make an envelope value naturally coincident with the target value at the envelope generator for a calculating formula. CONSTITUTION:The increased/decreased values are outputted as parallel bit data at a probability generator 2 and accumulated through a gate circuit 3 at an adder/subtracter 4, and the envelope value is stored in a RAM 5. A comparation control circuit 7 calculates difference between the envelope value and the target value from a target value instruction circuit 6. The high order side bit of the increased/decreased value passing through the gate circuit 3 is masked and accumulated so as to be a bit number smaller than the maximum digit number of a binary number showing this difference by one digit. |
