Communications: electrical – Audible indication – Percussion-type sound producer
Patent
1983-08-15
1986-11-04
Rowland, James L.
Communications: electrical
Audible indication
Percussion-type sound producer
340706, 340712, G08C 2100, G08C 900
Patent
active
046212574
ABSTRACT:
A video display touch detection digitizer for generating the coordinate position when the video display is touched. The light signals for the X and Y coordinate array are generated from the raster scan signals of the video display during selected periods of the vertical and horizontal blanking intervals. Vertical and horizontal mirrors reflect, respectively, the resulting row and columns of light signals across the screen of the video display where other mirrors reflect the signals to, respectively, row and column signal detectors. Control circuitry detects the resulting interruption in the rows and columns of light signals when the screen of the video display is touched and generates signals representing the touch coordinates.
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AT&T Bell Laboratories
Caccuro John A.
Rittmaster T.
Rowland James L.
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