Contour compensation circuit for a signal processing apparatus o

Details Contour compensation circuit for a signal processing apparatus o Contour compensation circuit for a signal processing apparatus o

1991-06-28

1994-04-12

Groody, James J.

Television

Image signal processing circuitry specific to television

Noise or undesired signal reduction

348625, H04N 5208

Patent

active

053030478

ABSTRACT:
A contour compensation circuit comprises a first delay circuit to generate a first signal that is the image signal delayed by a first required time, a second delay circuit to generate a second signal that is the result of addition of the input image signal and the signal that is the input image signal delayed by twice the required time, a subtractor circuit that generates a third signal that is the first signal subtracted by the second signal, an adder circuit that adds the first signal and third signal and outputs contour compensation signal, and a control circuit to control the ratio of addition of the third signal in response to the second signal. On the basis of the second signal, the control circuit is configured from a voltage control amplifier (VCA) that controls a voltage gain of a signal so that the higher a level of the second signal is the larger a contour compensation amount becomes.

REFERENCES:
patent: 4541014 (1985-09-01), Yagi
patent: 4994915 (1991-02-01), Takahashi et al.

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