Television camera highlight discharge apparatus

Facsimile and static presentation processing – Facsimile – Recording apparatus

Patent

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Details

H04N 534

Patent

active

042374910

ABSTRACT:
In a television camera having an electron scanning beam stabilizer circuit, a circuit for improved handling of highlights comprises means for forming an electrical signal corresponding to a pickup tube image highlight, limiting the magnitude of said signal to a predetermined level and utilizing that signal to form a highlight handling signal which causes the increase in beam scanning current necessary to discharge said highlight. In a color camera, the output from one pickup tube can be used to derive the signals necessary to control all three tubes simultaneously. A modified beam stabilizer circuit comprises means for allowing the beam current to increase without reduction by the beam stabilizer in order to discharge the highlight. A complementary signal derived from the highlight handling signal is applied to the modified beam stabilizer simultaneously with the highlight handling signal in order to neutralize the beam stabilizer.

REFERENCES:
patent: 3315034 (1967-04-01), White
patent: 3610823 (1971-10-01), Emmasingel et al.
patent: 3764738 (1973-10-01), Zettl
patent: 3955116 (1976-05-01), Van den Berg
patent: 3975657 (1976-08-01), Sato et al.
patent: 3999011 (1976-12-01), Sato et al.
patent: 4143305 (1979-03-01), Gibson et al.

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