Telegraphy – Systems – Position coordinate determination for writing
Patent
1981-06-16
1983-05-31
Schreyer, Stafford D.
Telegraphy
Systems
Position coordinate determination for writing
340712, 340717, G08C 1934
Patent
active
043862322
ABSTRACT:
In a system employing a plurality of touch sensitive screens which generate analog signals representing the coordinates of a position touched, a selection means is provided to select the screens rapidly in sequence with the analog output signals from the selected screen being fed to analog-to-digital converters. The sequence of selection proceeds rapidly from screen to screen until it is detected that a screen has been touched whereupon the selection sequencing pauses to permit the analog-to-digital conversion to be carried out and the resulting digital values to be read out to a computer system. Upon readout of the digital values to the computer system, the screen selection sequencing is again permitted to proceed. Means are provided to indicate whether a selected screen that is being touched was touched the last time the same screen was selected.
REFERENCES:
patent: 3302194 (1967-01-01), Green et al.
patent: 3516067 (1970-06-01), Cameron
patent: 3959585 (1976-05-01), Mattes et al.
"Design Guide," Analog (Interfacing to Computer Systems), published by Sierracin Corporation.
Aitken Richard L.
Foster Wheeler Energy Corporation
Naigur Marvin A.
Schreyer Stafford D.
Wilson John E.
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