Subcarrier regeneration circuit for color television receivers

Details Subcarrier regeneration circuit for color television receivers Subcarrier regeneration circuit for color television receivers

1976-10-15

1977-11-01

Martin, John C.

Facsimile and static presentation processing

Static presentation processing

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H04N 946

Patent

active

040568261

ABSTRACT:
In a subcarrier regeneration circuit for color television receivers, a phase detector output is sampled by a signal sample-and-hold circuit and a bias sample-and-hold circuit to develop a voltage between the outputs of the two sample-and-hold circuits to control the frequency of a 3.58 MHz subcarrier generated by a voltage controlled oscillator. The oscillator output is phase shifted by 90.degree. and applied to one input of the phase detector for comparison with a gated color burst. The signal sample-and-hold circuit samples the phase detector output during the interval of the color burst, while the bias sample-and-hold circuit samples the phase detector output during an interval which is substantially equal to the flyback interval minus the color burst interval.

REFERENCES:
patent: 3610955 (1971-10-01), Blaser et al.
patent: 3860954 (1975-01-01), Tsuchiya

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