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Time maintenance and display in a time keeping system including a time zone boundary
| Details |
Inventors: Nepple, Bruce C.; Gaskill, Garold B.;
Assignee: Seiko Corp. (both of, JP); Seiko Epson Corp. (both of, JP)
Primary Examiner: Roskoski; Bernard
Assistant Examiner:
Attorney, Agent or Firm: Galbi; Elmer
In a time keeping system providing time of day by radio signal to remote time keeping devices, the transmitted time of day is provided in association with a given time zone identification. The time keeping devices receiving the time of day reference and the time zone identification include a time zone preference identification. By comparing the time zone preference and the time zone identification transmitted, the time keeping device can, when necessary, offset the received time of day value according to user preference for display relative to a preferred time zone. |
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DETAILED DESCRIPTION In accordance with the present invention, a radio signal broadcast including time of day information further includes an indication of time zone associated with the transmitted time of day information.
Paging devices operating in the reception area include a preference indicator showing user preference for time display relative to a given time zone.
When the paging device seeks time of day information, it compares the indicated time of zone associated with the received time of day information with its preference for a particular time zone.
If the indicated time zone for the time of day matches the preference for a particular time zone or if no preference is indicated, then the time of day is accepted as is without modification.
On the other hand, if the time zone associated with the transmitted time of day does not match the paging device preference for a particular time zone, then an appropriate offset in the received time of day is executed and the modified time of day is taken as a time reference.
In this manner, multiple transmitters in a given reception area including a time zone boundary can deliver accurate time of day information with reference to a particular time zone and paging devices receiving such time of day information can adjust the time of day reference according to a user preference for a particular time zone.
In accordance with one aspect of the present invention, the radio signal broadcast may associate the time of day information as being either in or around a time zone boundary or not in or around a time zone boundary.
If the local time of day information is not associated with a time zone boundary, then paging devices can accept the broadcasted local time of day as is without reference to a user preferred time zone.
If, however, the local time of day information is associated with a time zone boundary, then the device executes the above-noted procedures of comparing the indicated time zone with a user time zone preference for time display, and possibly offsetting the received time of day according to user preference
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