Circuit for automatically controlling horizontal scanning freque

Details Circuit for automatically controlling horizontal scanning freque Circuit for automatically controlling horizontal scanning freque

1975-02-26

1976-11-02

Cook, Daryl W.

Dynamic magnetic information storage or retrieval

Monitoring or testing the progress of recording

360 11, 360 36, 360 10, H04N 5795

Patent

active

039901076

ABSTRACT:
A circuit for automatically controlling horizontal scanning frequency, used in the horizontal deflecting circuit of a display device which displays a still picture by repeatedly reading television signal for a single field stored in a field memory. The automatic frequency control circuit comprises a circuit for generating two horizontal sync signals which are 180.degree. out of phase from each other and a circuit for changing over the two signals at a period of the single field. Thus, a proper sequence of odd and even fields is obtained.

REFERENCES:
patent: 3573357 (1971-04-01), Toce
patent: 3732362 (1973-05-01), Kinjo
patent: 3886589 (1975-05-01), Nasu
patent: 3887941 (1975-06-01), Dann

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