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Automatic time zone adjustment of portable receiver

  • US 5,089,814 A
  • Filed: 07/23/1990
  • Issued: 02/18/1992
  • Est. Priority Date: 04/28/1989
  • Status: Expired due to Term
First Claim
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1. A portable receiver for receiving radio frequency (RF) signals on at least two frequencies, the portable receiver comprising:

  • receiving means for receiving the signals, the signals comprising a periodically transmitted location signal, the location signal comprising one of a plurality of geographic identification signals, each of said plurality of geographic identification signals uniquely identifying a geographic location corresponding to a local area RF signalling system transmitting the signals;

    decoding means for decoding the location signal;

    memory means for storing at least one predetermined location signal;

    frequency adjusting means coupled to said receiving means for selecting a first of said at least two frequencies in response to said decoded location signal not being equivalent to any of said at least one predetermined location signal and for selecting one of said at least two frequencies other than said first of said at least two frequencies in response to said decoded location signal being equivalent to one of said at least one predetermined location signal;

    time keeping means for keeping time of day; and

    time adjusting means for adjusting said time keeping means to the time of day corresponding to the geographic location of said local area RF signalling system in response to the decoded location signal matching one of said at least one predetermined location signal and for not adjusting said time keeping means to the time of day corresponding to the geographic location of said local area RF signalling system in response to the decoded location signal not matching any of said at least one predetermined location signal.

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