| 摘要 |
PROBLEM TO BE SOLVED: To carry out the compression/extension of signal, the compensation of the deterioration of a photodetecting pattern and the various corrections of a resolution ratio, disturbance light ratio, optical signal lightness/darkness ratio or optical signal contrast ratio by a single circuit. SOLUTION: In this intermediate processing circuit for wide dynamic signal, asymmetric CRD type two-terminal circuits (C1, R1, R2 and D1) are connected to the inverted terminal of an operational amplifier IC, bidirectional RD type two-terminal circuits (D2 and R3) are connected to a feedback circuit, and an offset control circuit is connected to the non-inverted terminal. Each of bidirectional RD type two-terminal circuits (D2 and R3) is constituted by parallel connecting a third resistor R3 for changing the operating point of a bidirectional two-terminal diode circuit D2 to this circuit and each of asymmetric CRD type two-terminal circuits (C1, R1, R2 and D1) is constituted by serial/parallel or parallel/serial connecting a first capacitor C1, a first resistor R1 and each of asymmetric RD type two-terminal circuits (R2 and D1). |
