Facsimile and static presentation processing – Facsimile – Recording apparatus
Patent
1980-08-26
1982-01-05
Murray, Richard
Facsimile and static presentation processing
Facsimile
Recording apparatus
358166, 358 39, 358 64, H04N 568
Patent
active
043097251
ABSTRACT:
In a signal processor for a beam-scan velocity modulation system in a color TV receiver, a video signal derived from the receiver's luminance channel (or from a combination of the color signal inputs to the receiver's kinescope drivers) is applied to a CR differentiator. Differentiator output is applied to the base of a first transistor disposed with a second transistor to form a first differential amplifier, and to the base of a third transistor disposed with a fourth transistor to form a second differential amplifier. Common load circuit for double-ended limiter formed by the two amplifiers is coupled to collectors of third and fourth transistors. Base bias for second transistor is positively offset from common base bias for first and third transistors, while base bias for fourth transistor is negatively offset therefrom. Output stage of processor, responsive to voltage across common load circuit, drives auxiliary deflection coils via coupling capacitor, which exhibits series resonance with coils at frequency in midband of video signal frequency range.
REFERENCES:
patent: 3752916 (1973-08-01), Lowry et al.
patent: 4170785 (1979-10-01), Yoshida et al.
patent: 4183064 (1980-01-01), Sahara et al.
patent: 4185301 (1980-01-01), Mitsuda et al.
patent: 4197558 (1980-04-01), Rutishauser
patent: 4261014 (1981-04-01), Lee
"25-V inch 114-Degree Trinitron Color Picture Tube and Associated New Developments", Yoshida et al., pp. 193-199 IEEE Transactions 8-74.
"Achievement of High Picture Quality in Color CRTs with the Beam-Scan Velocity Modulation Method" Yoshida et al., pp. 366-371, IEEE Transactions on Consumer Electronics, 8-77.
Meagher William H.
Murray Richard
Rasmussen Paul J.
RCA Corporation
Whitacre Eugene M.
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