Wireless alarm system
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United States of America Patent
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-
Mar 10, 1992
Issued Date -
N/A
app pub date -
Aug 20, 1990
filing date -
Nov 2, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A wireless alarm system using spread spectrum transmitters, fast frequency shift keying, spread spectrum receivers and computer with a display. The spread spectrum transmitter includes an oscillator coupled to a microprocessor with chip code generation means, preamble register, address register and data register. The spread spectrum receiver acquires synchronization of the spread spectrum signal using a microprocessor coupled to the quieting, signal strength or baseband output of the receiver, with a two step algorithm. The steps comprise achieving a coarse lock and a fine lock to the spread spectrum signal.
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