| 摘要 |
PURPOSE:To obtain a DC stabilized TV signal easily by finding the envelope output of the synchronizing signal peak level of the output of a clamping circuit by an envelope detector, and by subtracting the envelope output from the output of the clamping circuit. CONSTITUTION:The time constant of a clamping circuit 5 composed of a capacitor, a diode and a resistance is set small enough to prevent a TV signal from having a sag. The clamping output of this circuit 5 is inputted to the 1st terminal of a subtracter 6 composed of a differential amplifier, etc., and also supplied to an envelope detector 7. This detector 7 extracts the envelope component of the clamping output and its output is inputted to the 2nd terminal of the subtractor 6 to be subtracted from the clamping output inputted to the 1st terminal of the subtracter 6. The subtracter 6 outputs the DC regeneration output of the TV signal to the next stage. |
