Color television encoding circuit

Details Color television encoding circuit Color television encoding circuit

1983-01-12

1985-04-16

Martin, John C.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358150, H04N 946, H04N 506

Patent

active

045119155

ABSTRACT:
A color television encoding circuit suitable for use in a color television system in accordance with the NTSC or the PAL-standard. For the purpose of readjusting both the frequency and the phase of the line oscillator the circuit comprises only one control loop incorporating a phase comparison stage for detecting the difference of the phase of the chrominance subcarrier in the chrominance signals with respect to its zero value at the instant at which the leading edge of the synchronizing pulse reaches half the amplitude thereof. The output signal of the phase comparison stage is sampled once in every 2n line periods, where n is an integer, which results in the control signal for the line oscillator.

REFERENCES:
patent: 3590144 (1971-06-01), Bruch
patent: 4278994 (1981-07-01), Van der Valk

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