Beam index system having two distinct levels of index video sign

Details Beam index system having two distinct levels of index video sign Beam index system having two distinct levels of index video sign

1985-05-28

1987-03-17

Groody, James J.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 67, H04N 924

Patent

active

046511970

ABSTRACT:
A wide-band single beam index signal system includes a photo multiplier tube supplying a decay compensation circuit for developing an output signal responsive to excitation of index strips by the electron beam of the CRT. The output signal is supplied to a differentiator to determine its zero crossing and supplied to a comparator circuit where an index signal pulse is developed. The timing of the index signal is determined by the zero crossing. Video information is clocked from a computer, on a pixel-by-pixel basis, under control of the index signal. The index signal also controls production of a first index video signal and a second index video signal, depending upon the presence or absence of video information. Means are included for turning off the electron beam between index strips. The output of the differentiator is offset for noise compensation. An offset adjustment transistor is included for changing the offset to compensate for the greater excitation of the index strip in the presence of video and to thereby maintain the zero crossing reference.

REFERENCES:
patent: 3406251 (1968-10-01), Jones
patent: 3977022 (1976-08-01), Sunstein
patent: 4408223 (1983-10-01), Midland
patent: 4468690 (1984-08-01), Midland
patent: 4527192 (1985-07-01), Midland et al.

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