Method and apparatus for a touch sensitive system employing spread spectrum technology for the operation of one or more input devices
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United States of America Patent
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N/A
Issued Date -
May 2, 2002
app pub date -
Jun 8, 2001
filing date -
Sep 26, 2000
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A touch sensing apparatus for receiving input from one or more touch stimulating devices employs a spread spectrum signaling arrangement to transmit signals from the touch stimulating devices for identification and location determination. Spread spectrum techniques may include DSSS, FHSS, THSS, chirp, or combinations thereof. Passive devices operate in the propagation medium of an energy field formed of acoustic, EM, or light waves and reflect signals to signal pickups, where RSS or time delay techniques are used to determine location and spread spectrum encoding is used to identify the devices. Active devices generate a touch stimulating signal that is spread spectrum encoded for identification, and signal pickups in a propagation medium receive the touch stimulation signals which are identified by the SS encoding and located using RSS or time-delay techniques.
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