Information display position-defining circuit for a cathode ray

Details Information display position-defining circuit for a cathode ray Information display position-defining circuit for a cathode ray

1978-12-06

1980-10-14

Trafton, David L.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340744, 340749, 340791, 340803, 358148, 358183, G06F 3153

Patent

active

042284333

ABSTRACT:
There is provided an information display position-defining circuit comprising a local pulse oscillator reset by a horizontal synchronization pulse; a horizontal pulse counter which is reset by the horizontal synchronization pulse and counts an output pulse from the local pulse oscillator; a vertical pulse counter which is reset by a vertical synchronization pulse and counts the horizontal synchronization pulse; and a character position signal generator for issuing a signal denoting a character display position in response to output signals from the horizontal and vertical pulse counters. The circuit further includes a signal generator designed to selectively send forth a first signal having the same frequency and phase as the horizontal synchronization pulse and a second signal having the same frequency as the first signal, but having a phase different from a first signal; and a comparator for comparing the phases of an output signal from the signal generator and vertical synchronization pulse and, at the same time of synchronization between both phases, selecting the first or second signal.

REFERENCES:
patent: 3793483 (1974-02-01), Bushnell
patent: 4016362 (1977-04-01), Bristow et al.
patent: 4019090 (1977-04-01), Wolff et al.
patent: 4045789 (1977-08-01), Bristow
patent: 4107665 (1978-08-01), Mayer et al.

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