Synchronizing system for character display

Details Synchronizing system for character display Synchronizing system for character display

1982-04-05

1984-10-02

Chin, Tommy P.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358148, 340730, 340814, H04N 522, H04N 593

Patent

active

044751249

ABSTRACT:
A system is described for synchronizing the display of characters within a character image area on a raster scanned cathode ray tube. The system's input is a composite blanking signal which includes conventional horizontal rate and vertical rate blanking pulses. In response to the composite blanking signal, the system generates a reset signal when the tube's scan reaches a reference position such as at the top of display. The reset signal and the composite blanking signal are used to develop a control signal when the composite blank signal indicates that the tube's scan has reached the character image area. Other circuitry responds to the control signal and the composite blanking signal for addressing a conventional character display circuit. The latter circuit is thus synchronized to output, to the cathode ray tube, data which is imaged within the character image area.

REFERENCES:
patent: 2752422 (1956-06-01), Alexander
patent: 3993864 (1976-11-01), Pye et al.

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