Amplitude adjusting equipment in a signal translation line

Details Amplitude adjusting equipment in a signal translation line Amplitude adjusting equipment in a signal translation line

H - Electricity

04

N

350/82

H04N 5/57 (2006.01) H04N 9/64 (2006.01)

Patent

CA 1215775

ABSTRACT OF THE DISCLOSURE An amplitude-adjusting circuit used for a contrast- adjusting circuit of resistor division type in which a video signal is applied across a pair of series-connected resistors and an output is produced from the junction point of the two resistors. At least one of the resistors is used as a variable resistor. The amplitude-adjusting circuit comprises a current source for supplying a constant current steadily between the terminals of the variable resistor, a high-gain amplifier for controlling the resis- tance value of the variable resistor, and a filter for separating the video signal component from the change of the value of the variable resistor represented by a voltage change, and introducing the resistance change to the high- gain differential amplifier.

446716

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