Method and apparatus for a touch sensitive system employing direct sequence spread spectrum (DSSS) technology
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United States of America Patent
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Aug 1, 2006
Issued Date -
N/A
app pub date -
Jul 25, 2002
filing date -
Jun 8, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A touch sensing apparatus for receiving input from one or more touch stimulating devices employs a direct sequence spread spectrum (DSSS) signaling arrangement to transmit signals from the touch stimulating devices for identification and location determination. Active devices are powered by an EM field and generate a touch stimulating signal that is spread spectrum encoded for identification, and signal pickups in a propagation layer receive the touch stimulation signals which are identified by the DSSS encoding and located using received signal strength (RSS) techniques. Semi-active devices are powered by an EM field and receive code instructions to generate specific spread spectrum signals and generate a touch-stimulating signal. Touch stimulating devices are either tethered or tether-free, and powered by batteries or EM fields.
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