Capacitive-type nonlinear emphasis circuit

Details Capacitive-type nonlinear emphasis circuit Capacitive-type nonlinear emphasis circuit

1977-08-16

1980-04-15

Griffin, Robert L.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358167, 360 25, 360 30, 360 33, 455 43, H04N 576, H04N 521, G11B 502, G11B 504

Patent

active

041986504

ABSTRACT:
A video signal processing circuit includes an amplifier with a circuit connected to it to emphasize the amplification of some frequencies relative to others. A non-linear circuit is also connected to the amplifier and comprises a capacitor connected in series with non-linear elements that change the amplification of positive and negative overshoots of the signal relative to the middle amplitude range. The result is non-linear modification of emphasis and can be used to pre-emphasize video signals before using them to modulate the frequency of a carrier and, in the playback section to de-emphasize the signals to minimize FM noise. Use of the capacitor prevents direct current from flowing and thus affecting the threshold levels of the non-linear elements. Component values can be selected to effect temperature compensation.

REFERENCES:
patent: 3288930 (1966-11-01), Johnson
patent: 3548323 (1970-12-01), Gordon et al.
patent: 3730983 (1973-05-01), Numakura et al.
patent: 3769612 (1973-10-01), Yamazaki
patent: 3795876 (1974-03-01), Takahashi et al.
patent: 3798562 (1974-03-01), Takahashi et al.
patent: 3873992 (1975-03-01), Sato et al.
patent: 3918085 (1975-11-01), Numakura et al.
patent: 3978409 (1976-08-01), Dolby et al.
patent: 4012771 (1977-03-01), Ishigaki et al.

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