Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1985-12-20
1987-03-03
Groody, James J.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358158, 358159, H04N 506
Patent
active
046479708
ABSTRACT:
A sync signal reproducing circuit for television receivers. The circuit comprises; a composite sync signal source for supplying a composite sync signal, a voltage controlled oscillator, a first frequency divider connected to the voltage controlled oscillator for dividing an oscillating frequency of the voltage controlled oscillator, a second frequency divider connected to the first frequency divider for generating a horizontal sync scan signal by dividing the divided output frequency further, a horizontal deflection circuit connected to the second frequency divider, the horizontal deflection circuit producing a flyback pulse referring to the horizontal sync scan signal, a downcounter connected to the first frequency divider for generating a vertical sync scan signal by counting down the divided output frequency, a phase detecting circuit connected to the composite sync signal source and the horizontal deflection circuit for performing a phase detection of the composite sync signal and a sawtooth signal obtained by converting a waveform of the flyback pulse, a connection circuit connected between the phase detecting circuit and voltage controlled oscillator for supplying a phase detecting output signal detected by the phase detecting circuit to the voltage controlled oscillator as a control signal, and a mask signal producing circuit connected between the downcounter and the phase detecting circuit for generating a mask signal which masks the phase detecting circuit for a fixed time on the basis of the count output from the downcounter.
REFERENCES:
patent: 3751588 (1973-08-01), Eckenbrecht
patent: 4245251 (1981-01-01), Steckler et al.
patent: 4251833 (1981-02-01), Fernsler et al.
patent: 4498103 (1985-02-01), Aschwanden
patent: 4536794 (1985-08-01), Fernsler et al.
Groody James J.
Kabushiki Kaisha Toshiba
Parker Michael D.
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