Computer graphics processing and selective visual display system – Display peripheral interface input device – Touch panel
Patent
1996-04-15
1998-09-08
Saras, Steven J.
Computer graphics processing and selective visual display system
Display peripheral interface input device
Touch panel
345177, 345179, 178 18, 178 19, G09G 302, G08C 2100
Patent
active
058051473
ABSTRACT:
With the use of transfer delay of supersonic wave, an apparatus for measuring a distance and inputting coordinates accurately is implement. When a distance is measured with the use of the transfer of supersonic wave, the transfer delay time is measured at the specified portion of a detected signal. The position of the specified portion to be measured may shift due to the level of the detected signal or noise. The signal obtained by delaying the specified time the envelope of the detected signal is generated. The signal obtained by attenuating the envelope at the specified rate and adding the specified offset is also generated. A gate signal is formed by obtaining the differential of these two generated signals. The delay time is measured during the gate period. With this configuration, the gate-period timing is immune to influences of the signal level and noise, providing highly precise coordinate inputs.
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Kobayashi Katsuyuki
Sato Hajime
Tanaka Atsushi
Tokioka Masaki
Yanagisawa Ryozo
Canon Kabushiki Kaisha
Saras Steven J.
Shankar Vijay
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