Communications: electrical – Continuously variable indicating – With meter reading
Patent
1990-08-17
1992-12-01
Yusko, Donald J.
Communications: electrical
Continuously variable indicating
With meter reading
34082547, 34082548, 370 82, 370 951, 379 60, 4551811, 455343, G08B 522, H04J 316
Patent
active
051682710
ABSTRACT:
A wide area paging system is disclosed in which paging messages input to the system in one local area can be broadcast to a receiver in any other local area without necessarily broadcasting the message in all areas. A local area clearinghouse in each area stores resident subscriber data including current location and receiver serial number. This data is used to transfer messages over a data network to the correct clearinghouse. The system uses a TDM data protocol. The data is encoded and transmitted at a very high rate (e.g., 19,000 baud) in short packets (256 bits/13 milliseconds) via stereo FM sidebands. Receivers are assigned to receive sequentially numbered time slots matching a portion of their address. The addresses of intended receivers are included in the data packets. Battery-powered receivers are deactivated between packets and reactivated in accordance with the sequential time slot number scheme to receive an incoming packet. Messages longer than a packet are segmented and transmitted in two or more packets, linked together by data contained in the packets. A watch pager used in the system employs a wristband antenna which electromagnetically couples to the user's body. The watch pager displays time, telephone numbers and icons representing common types of paging messages.
REFERENCES:
patent: 3937004 (1976-02-01), Natori et al.
patent: 4358836 (1982-11-01), Tohyama et al.
patent: 4369443 (1983-01-01), Giallanza et al.
patent: 4383257 (1983-05-01), Giallanza et al.
patent: 4398192 (1983-08-01), Moore et al.
patent: 4734694 (1988-03-01), Umetsu et al.
Galbi Elmer
Seiko Corp.
Seiko Epson Corp.
Yusko Donald J.
Zimmerman Brian
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