System for generating 2H pulses in a television receiver

Details System for generating 2H pulses in a television receiver System for generating 2H pulses in a television receiver

1982-04-05

1984-05-01

Chin, Tommy P.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358 20, H04N 940, H04N 506

Patent

active

044464827

ABSTRACT:
A system for generating 2H pulses by counting cycles of reference signals whose frequency is related to the frequency of a color subcarrier signal. In one embodiment, four such reference signals are provided, each phase separated from the other by ninety degrees. A counter receives one of the reference signals for counting its cycles up to a preselected integral count. When the preselected count is reached, further circuitry generates an output pulse for clearing the counter and holding it cleared while the next reference signal is applied to the counter. The cycle of counting reference signal cycles, clearing the counter, and applying the next reference signal to the counter continues such that the four reference signals are applied to the counter sequentially. By proper selection of the integral count reached by the counter and the duration of its cleared state, the output pulses are developed at a 2H rate.

REFERENCES:
patent: 3716795 (1973-02-01), Brown
patent: 3777063 (1973-12-01), Meacham
patent: 4156254 (1979-05-01), Marino
patent: 4360825 (1982-11-01), Srivastava

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