White level clipping circuit

Details White level clipping circuit White level clipping circuit

1975-03-31

1976-09-14

Griffin, Robert L.

Telegraphy

Systems

Simplex-reversing periodic

360 33, 178DIG12, H04N 516

Patent

active

039808157

ABSTRACT:
A white level clipping circuit has an impedance element through which a video signal is supplied from an input terminal to an output terminal, the emitter of a PNP-type transistor is connected to the output side of the impedance element and the collector thereof is grounded while the base of the transistor is supplied with a constant bias voltage to effect white level clipping of the video signal derived at the output terminal. This clipping circuit carries out positive clipping operation with no frequency characteristics and hence avoids possible overmodulation when the clipped video signal is frequency-modulated for the recording thereof.

REFERENCES:
patent: 3557305 (1968-03-01), Dann
patent: 3573352 (1971-04-01), Fujita
patent: 3595993 (1969-08-01), Pratt
patent: 3666969 (1972-05-01), Karrier et al.
patent: 3737678 (1973-06-01), Dolby et al.
patent: 3878325 (1975-04-01), Cecchin et al.

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