Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Patent
1991-08-14
1993-01-12
Blum, Theodore M.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
H01J 2970, H01J 2976
Patent
active
051793202
ABSTRACT:
A deflection system comprises a variable gain amplifier for a luminance component of a video signal. A first differentiator differentiates the amplified luminance component. An output amplifier modulates beam scan velocity of an electron beam by energizing an auxiliary horizontal deflection yoke responsive to the differentiated luminance component. A second differentiator differentiates the differentiated luminance component. An integrator integrates the twice differentiated luminance component. The output of the integrator is a gain control signal. The variable gain amplifier has a gain which varies responsive to the gain control signal. The gain varies inversely with the frequency content of the luminance component. The second differentiator and integrator form a feedback loop. The feedback loop has a sufficiently large time constant relative to level transitions of the luminance component that the deflection signal corresponds to the first derivative of the luminance component independent of the variable gain.
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Yoshida et al., Achievement of High Picture Quality in Color CRTs with the Beam-Scan Velocity Modulation Method, IEEE Transactions on Consumer Electronics, vol. CE-23, No. 3, Aug. 1977.
Haenen et al., Scan-Velocity Modulation Increases TV Picture Sharpness, Electronic Components and Applications, vol. 4, No. 1, Nov. 1981.
"Sony 27" color Monitor KC-27HV2, Television Technology, Apr. 1991, pp. 31-36, Yoshiro Kaneko et al., and translation.
Blum Theodore M.
Fried Harvey D.
Laks Joseph J.
RCA Thomson Licensing Corporation
Tripoli Joseph S.
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