Circular zig-zag scan video format

Details Circular zig-zag scan video format Circular zig-zag scan video format

1991-03-21

1992-06-09

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

H01J 2978

Patent

active

051210371

ABSTRACT:
A circular, ziz-zag scan for use with vidicon tubes. A sine wave is generated, rectified and its fourth root extracted. The fourth root, and its inverse, are used to generate horizontal ramp and sync signals. The fourth root is also used to generate a vertical sync signal, and the vertical sync signal, along with the horizontal sync signal, are used to generate the vertical ramp signal. Cathode blanking and preamplifier clamp signals are also obtained from the vertical sync signal.

REFERENCES:
patent: 3593286 (1971-07-01), Altman
patent: 3659142 (1972-04-01), Phillips
patent: 3662102 (1972-05-01), Herndon

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