| 摘要 |
PURPOSE:To obtain a desired equalized characteristic in a high speed by adopting a binary research and approaching a parameter changing the equalizing characteristic to the optimum parameter while having the said parameter at each revision. CONSTITUTION:Let an object equalizing characteristic of an amplification factor where a peak value of an output signal of an equalizing circuit 2 is within a reference range be a characteristic number 10. First, an evaluation parameter detection circuit 16 selects a number 9 being the center of the entire characteristic to detect the peak value of the circuit 2. A comparator circuit 17 compares the detected peak value with a reference value 18 and recognizes that the peak value of the characteristic 9 is less than the reference value and gives a command to an addition/subtraction command circuit 19 to increase the characteristic number. A 1/2 circuit 20 stores 8 as the initial characteristic number change, outputs a change amount 4 being the half and an addition/subtraction circuit 21 outputs an operation of 9+4=13 to a characteristic setting circuit 2. The circuit 22 controls the circuit 2 to select the characteristic number 13. Since the peak value of the number 13 is larger than the reference value, the circuit 19 gives a command to lower the characteristic number and repeats the operation subtracting a half of the change amount of the circuit 20 to obtain the characteristic number 10. |
