Telegraphy – Systems – Position coordinate determination for writing
Patent
1991-11-08
1993-09-21
Schreyer, Stafford
Telegraphy
Systems
Position coordinate determination for writing
G08C 2100
Patent
active
052471381
ABSTRACT:
In a cordless digitizing system wherein a cordless stylus having a manually operable button thereon transmits positional pulses to a tablet at a carrier frequency this invention is apparatus for transmitting status information about the button to the tablet. There is first status logic associated with the stylus for sensing the present status of the button and for encoding and transmitting the present status of the button as a binary 1 or 0 employing a first unique and recognizable sequence of carrier frequency cycles as a binary "1" and a second unique and recognizable sequence of carrier frequency cycles as a binary "0". Then, there is second status logic included in association with the tablet for recognizing the first unique and recognizable sequence of carrier frequency cycles to be a binary "1", for recognizing the second unique and recognizable sequence of carrier frequency cycles to be a binary "0", and for determining the present status of the button therefrom. The status of multiple buttons on the stylus is transmitted in the same manner by assigning the buttons positions in a binary data stream.
REFERENCES:
patent: 5138118 (1992-08-01), Russell
CalComp Inc.
Porter, Jr. Wm. F.
Schreyer Stafford
Streck Donald A.
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