Pager

• US 4,734,694 A
• Filed: 08/12/1985
• Issued: 03/29/1988
• Est. Priority Date: 08/22/1984
• Status: Expired due to Term

• Current Assignee: NEC Corporation
• Original Assignee: NEC Corporation
• Inventors: Nagata, Koichi, Ichikawa, Yutaka, Umetsu, Shinjiro
• Primary Examiner(s): Weldon, Ulysses
• Assistant Examiner(s): Smith, Ralph E.
• Application Number:
  US06/764,857
• Time in Patent Office: 960 Days
• Field of Search: 340/825.44, 340/825.47, 340/825.48, 455/33, 455/36, 455/77, 455/76, 455/179, 455/150, 379/59, 379/60
• US Class Current: 340/7.33
• CPC Class Codes: G08B 3/1016 using wireless transmission calling systems using transmission by inductive loop H04B5/00
• CPC Class Codes: G08B 5/224 Paging receivers with visible signalling details
• CPC Class Codes: H04W 84/022 One-way selective calling networks, e.g. wide area paging
• CPC Class Codes: Y02D 30/70 in wireless communication networks

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.

Claims

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.

2. A pager as claimed in claim 1, wherein during the first intermittent reception mode operation the channel control section divides the receivable frequencies into groups a plurality of first frequency groups, and sequentially switches and receives the frequencies in the respective first frequency groups within a receive period of time of a single intermittent reception.

3. A pager as claimed in claim 2, wherein, the channel control section during the first intermittent reception mode operation, subsequent to a change from a synchronous state to a non-synchronous state with respect to the own paging signal group switching the receive frequencies beginning with a particular one of the first frequency groups to which a particular receive frequency immediately before the non-synchronous state belongs.

4. A pager as claimed in claim 2, wherein said channel control section during the first intermittent reception mode operation, after a change from the synchronous state to the non-synchronous state redivides the receivable frequencies into a plurality of second frequency groups which are headed by a particular one of the frequency groups which has the receive frequency to which the pager has been tuned immediately before the change from the synchronous state to the non-synchronous state, and switches the receive frequencies beginning with the heading frequency group.

5. A pager as claimed in claim 1, further comprising a display for visual identification of the receive frequencies.

6. A pager as claimed in claim 5, further comprising a switch for activating the display.

7. A pager as claimed in claim 6, wherein the switch also functions as a switch for stopping notification of a call which is meant for the pager.

8. A pager as claimed in claim 1, wherein at least one of a group designation signal and paging signal which are assigned to the pager is altered when the receive frequency is switched.