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Wireless activation system, method and device

  • US 20060164207A1
  • Filed: 11/19/2003
  • Published: 07/27/2006
  • Est. Priority Date: 11/30/2002
  • Status: Active Grant
First Claim
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1. A wireless activation system comprising a first device (400) having means (460,420) for generating and transmitting a code signal, wherein each successive transmission of the code signal comprises a successive code sequence from a succession of code sequences, and a second device (200) having means (210,240,250,260) for generating the succession of code sequences in synchronism with the first device, means (110) for receiving the code signal, means (160) for detecting the successive code sequence transmitted by the first device, means (210) for generating an indication of the time of flight of the code signal, and means (210) for generating an activation signal in response to the combination of the detected successive code sequence corresponding to the successive code sequence generated most recently by the second device and the indication of the time of flight being within a predetermined range of values, wherein the succession of code sequences comprises code sequences of different time durations.

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