Automatic time zone adjustment of portable receiver
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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Abstract
A portable receiver has a time of day clock and receives a signal indicative of the location of the portable receiver. The portable receiver has a memory which has a plurality of locations with corresponding time zones. Upon reception of the location signal, the receiver determines the time zone of the location and the time zone of the time of day clock. The time of day clock is then adjusted to correspond to the time zone of the location. The location signal may also be used to adjust the operating frequency of the receiver.
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Citations
16 Claims
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1. A portable receiver for receiving radio frequency (RF) signals on at least two frequencies, the portable receiver comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A portable radio frequency (RF) receiver for receiving signals transmitted by a plurality of RF signalling systems, the portable RF receiver comprising:
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receiving means for receiving said signals, said 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 transmitted by one of said plurality of RF signalling systems and uniquely identifying a said one of said plurality of RF signalling system; decoding means for decoding the 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 a geographic location of said one of said plurality of RF signalling systems in response to the decoded location signal comprising one of said plurality of geographic identification signals corresponding to said one of said plurality of RF signalling systems. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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Specification