Method and device for adjusting the black level of a video signa

Details Method and device for adjusting the black level of a video signa Method and device for adjusting the black level of a video signa

1983-12-16

1986-01-14

Masinick, Michael A.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

307264, 307549, 307555, H04N 518, H03L 500, H03B 104, H03B 1900

Patent

active

045648638

ABSTRACT:
Method and device by which, at a given instant, a conductor (4) at the output of a capacitor (5) carrying a video signal is connected to a reference voltage source (1, 2). The use of a voltage source (1, 2) whose impedance depends on the direction of the current which it supplies, makes it possible to connect the conductor (4) to the voltage source (1, 2) during the whole duration of a line flyback, instead of being obliged to use a special pulse occurring solely at the end of the line flyback time. In the case of positive white, for example, a positive current supply part of the voltage source (2) having a high impedance sends a positive supply current to the conductor (4) carrying the video signal, and a low-impedance negative current supply part (1) connects this conductor to ground.

REFERENCES:
patent: 3811053 (1974-05-01), Habib
patent: 4178558 (1979-12-01), Nagashima et al.

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