Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1979-12-20
1981-09-29
Martin, John C.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358190, 315411, H04N 504, H04N 318
Patent
active
042926548
ABSTRACT:
A television horizontal deflection system and a switched-mode power supply are provided which share a single sawtooth waveform generator for the generation of delayed deflection signals and delayed power supply gating signals, respectively. The sawtooth waveform generator has an input coupled to receive pulses which are maintained in phase and frequency synchronism with the sync pulses of the video signal. The sawtooth waveform is applied to a comparator in the horizontal deflection system where it is compared with a D.C. voltage resulting from the phase comparison of the sync and flyback pulses to determine the time of delayed generation of the succeeding horizontal deflection signals. The sawtooth waveform is also applied to a comparator in the power supply to determine the time of delayed generation of the succeeding gating signals for the SCR or like device. By selecting a time constant for the phase adjustment between sync and flyback in the deflection system which is smaller (i.e., faster) than the time constant of the regulated supply, the phase differences between sync and flyback are so quickly compensated for by the deflection system that their effects on the regulated supply are minimized.
REFERENCES:
patent: 3767960 (1973-10-01), Ahrens
patent: 3832595 (1974-08-01), Dietz
patent: 3928787 (1975-12-01), Geiger
patent: 3970780 (1976-07-01), Minoura
Mills, "A Five-Function IC for Television Receivers", IEEE Trans. on BTR, Oct. 1969, vol. BTR-15, No. 3, pp. 277-284.
Bissinger, "Stabilisiertes Netzteil fur die Horizontal-End Stufe", Funkschau, 1970, No. 11, pp. 363-366.
Balaban Alvin R.
Steckler Steven A.
Martin John C.
Meagher W. H.
Rasmussen P. J.
RCA Corporation
Yorks, Jr. W. B.
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