Pager
First Claim
Patent Images
1. A pager comprising:
- a radio section for selectively receiving one of n radio frequency signals (n being an integer not smaller than
2) whose frequencies are different from each other, each radio frequency signal being modulated by a signal comprising a plurality of paging signal groups each of which is made up of at least a frame sync which is the same as frame sync signals of the other groups, a group designation signal which differs from group designation signals of the other groups, and a plurality of paging signals;
a channel control section for controlling a receive frequency assigned to said radio section;
a timing generator section for performing a control such that only an own paging signal group with which the pager is associated is received; and
a synchronization control section for controlling a synchronization condition of the pager with the own paging signal group;
said timing generator section operating in a first intermittent reception mode when a power source of the pager is turned on or when the pager is non-synchronous to the own paging signal group and in a second intermittent reception mode when the paper is synchronous to the own paging signal group;
during the first intermittent reception mode operation the channel control section sequentially switching the receive frequency until a frame sync signal has been detected, the synchronization control section tuning the pager to the receive frequency on which the frame sync signal has been detected;
when the pager has been tuned to the own group, the channel control section locking the receive frequency at a particular frequency which has occurred when the pager has been tuned.
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Accused Products
Abstract
A pager which is usable in a plurality of service areas is disclosed. The pager includes a radio section for selectively receiving and modulating two or more radio frequencies, and frequency switching means for switching the receive frequency of the radio section when a signal on a predetermined receive frequency fails to be received. Power source control means is provided for cutting down power consumption. The own call signal is switched at the same time as the receive frequency to offer an effect as would be provided by a plurality of pagers. The receive frequency is displayed so that the user may see a particular service area to which his or her own pager belongs.
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Citations
8 Claims
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1. A pager comprising:
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a radio section for selectively receiving one of n radio frequency signals (n being an integer not smaller than
2) whose frequencies are different from each other, each radio frequency signal being modulated by a signal comprising a plurality of paging signal groups each of which is made up of at least a frame sync which is the same as frame sync signals of the other groups, a group designation signal which differs from group designation signals of the other groups, and a plurality of paging signals;a channel control section for controlling a receive frequency assigned to said radio section; a timing generator section for performing a control such that only an own paging signal group with which the pager is associated is received; and a synchronization control section for controlling a synchronization condition of the pager with the own paging signal group; said timing generator section operating in a first intermittent reception mode when a power source of the pager is turned on or when the pager is non-synchronous to the own paging signal group and in a second intermittent reception mode when the paper is synchronous to the own paging signal group; during the first intermittent reception mode operation the channel control section sequentially switching the receive frequency until a frame sync signal has been detected, the synchronization control section tuning the pager to the receive frequency on which the frame sync signal has been detected; when the pager has been tuned to the own group, the channel control section locking the receive frequency at a particular frequency which has occurred when the pager has been tuned. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification