Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Patent
1987-07-16
1989-02-07
Blum, Theodore M.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
358158, H01J 2970, H01J 2972
Patent
active
048034070
ABSTRACT:
Instead of fine-controlling the horizontal deflection signal in a digital television receiver by means of two phase-locked loops and gate-delay stages as is done in prior art arrangements, in the horizontal-deflection circuit according to the invention, a first digital word delivered by a first phase-locked loop and representative of the horizontal frequency is added in an adder to a suitably amplified third digital word delivered by a phase comparator of a second phase-locked loop. The output of the adder is fed to the control input of a digital sine-wave generator which drives a frequency divider. The latter delivers the horizontal deflection signal, which drives the horizontal output stage. The phase comparator is fed with the horizontal flyback signal, which is derived from the horizontal deflection signal, and a second digital word generated by the first phase-locked loop and representative of the desired phase position of the flyback signal.
REFERENCES:
patent: 4636861 (1987-01-01), Willis
ITT Intermetall Data Book, Digit 2000 VLSI Digital TV System, May 1985, pp. 112-114.
Patent Abstracts of Japan, vol. 7, No. 222 (E-201) (1367) Oct. 3, 1983, Fujitsu K.K.
Datenbuch Der Firma Intermetall--Digit 2000, VLSI Digital TV System, May 1984, pp. 112-113.
Blum Theodore M.
Deutsche ITT Industries GmbH
Peterson Thomas L.
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