Call alarming apparatus for paging system

Details Call alarming apparatus for paging system Call alarming apparatus for paging system

1994-04-28

1996-07-02

Yusko, Donald J.

Communications: electrical

Continuously variable indicating

With meter reading

34082544, 340333, 455 383, 455343, G08B 522

Patent

active

055326854

ABSTRACT:
A call alarming apparatus for a paging system, includes a receiver, an alarming circuit, a drive circuit, a controller, a first power supply, a second power supply, and a rectifier. The receiver receives a call number as a radio signal. The alarming circuit is driven to alarm a call when the receiver receives a self call number. The drive circuit drives the alarming circuit by inputting a control signal to the drive circuit. The controller outputs a control signal to the drive circuit on the basis of an output from the receiver. The first power supply supplies power to the alarming and drive circuits. The second power supply is automatically switched to supply power to the drive circuit when a power supply voltage of the first power supply drops. The rectifier prevents a current from flowing from the second power supply into the first power supply.

REFERENCES:
patent: 4588989 (1986-05-01), Yasuda et al.
patent: 5007105 (1991-04-01), Kudoh et al.
patent: 5019803 (1991-06-01), Maram
patent: 5203020 (1993-04-01), Sato et al.
patent: 5272475 (1993-12-01), Eaton et al.
patent: 5353017 (1994-10-01), Suzuki et al.

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