Complementary pre-emphasis and de-emphasis circuits for a video

Details Complementary pre-emphasis and de-emphasis circuits for a video Complementary pre-emphasis and de-emphasis circuits for a video

1979-07-12

1981-07-28

Murray, Richard

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358160, 375 34, 455 43, H04N 514

Patent

active

042813468

ABSTRACT:
Complementary circuits for pre-emphasis and de-emphasis of video luminance signals, the circuits permitting an improved signal-to-noise ratio in a video signal transfer channel. The video signal has separate frequency- and amplitude-sensitive portions as well as a linear gain portion, thereby providing a fixed gain up to a predetermined lower frequency, a fixed response between this frequency and a variable upper frequency breakpoint, and an amplitude-dependent gain above the upper frequency breakpoint. De-emphasis is performed by a circuit also having separate frequency- and amplitude-sensitive portions and a linear gain portion, and which may be readily matched to the pre-emphasis circuit.

REFERENCES:
patent: 3288930 (1966-11-01), Johnson
patent: 3290433 (1966-12-01), De France et al.

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