Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1976-12-27
1980-04-29
Safourek, Benedict V.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
455 63, 333 14, 360 65, 360 33, H04N 953
Patent
active
042008891
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: 3111635 (1963-11-01), Skov et al.
patent: 3117278 (1964-01-01), Johnson
patent: 3193771 (1965-07-01), Boatwright
patent: 3350512 (1967-10-01), Percival et al.
patent: 3641468 (1972-02-01), Hodder
patent: 3902131 (1975-08-01), Dorren
patent: 3970968 (1976-07-01), Sly
patent: 3972010 (1976-07-01), Dolby
patent: 4000369 (1976-12-01), Paul, Jr. et al.
BASF - Aktiengesellschaft
Safourek Benedict V.
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