Adaptive crosshatch signal generator

Details Adaptive crosshatch signal generator Adaptive crosshatch signal generator

1989-05-31

1995-03-14

Hjerpe, Richard

Computer graphics processing and selective visual display system

Data responsive crt display control

Data responsive deflection and intensity control

345 14, 345 24, 348181, G09G 100

Patent

active

053980409

ABSTRACT:
An adaptive crosshatch signal generator includes a frequency detector for detecting a horizontal scanning frequency, a square calculator supplied with the detected output of the frequency detector, and a variable pulse width multivibrator controlled to have an output pulse width substantially in inverse proportion to the squared output. Longitudinal lines of a crosshatch signal are formed by the output pulses of the multivibrator. The crosshatch signal has a longitudinal line width which is always substantially equivalent to the distance between adjacent scanning lines and is generated by using a simplified configuration irrespective of input signal format.

REFERENCES:
patent: 2978540 (1961-04-01), Coate
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patent: 4045815 (1977-08-01), Griffith
patent: 4093960 (1978-06-01), Estes
patent: 4414567 (1983-11-01), Berke et al.
patent: 4466014 (1984-08-01), Wilensky et al.
patent: 4535353 (1985-08-01), Turner

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