Telecommunications – Transmitter and receiver at separate stations – Frequency or phase modulation
Patent
1991-02-28
1992-12-08
Coles, Sr., Edward L.
Telecommunications
Transmitter and receiver at separate stations
Frequency or phase modulation
34082544, H04B 700
Patent
active
051704870
ABSTRACT:
The present invention provides a pager system which integrates a plurality of transmitters which operate at different frequencies. Some of the transmitters transmit paging messages using FM subcarrier signals (termed FM-SCA signals) and some transmit messages using a modulated carrier (termed RCC signals). The receiver includes two front ends. One front end receives and demodulates FM-SCA signals and one front end receives and demodulates RCC signals. Each paging message is transmitted on both FM-SCA transmitters and on RCC transmitters. The signals on each of the transmitters are slightly off set in time. When an assigned time slot occurs, one receiver turns on and attempts to receive a message, if it does not receive an appropriate signal, it tunes to another station that is in a stored list of stations. If the next station has an RCC flag associated therewith the RCC receiver rather than the FM-SCA receiver is operated. The entire process is controlled by a microprocessor which is a part of the system.
REFERENCES:
patent: 3961143 (1976-06-01), Thyssens
patent: 4644347 (1987-02-01), Lucas et al.
patent: 4891638 (1990-01-01), Davis
Coles Sr. Edward L.
Galbi Elmer
Negash Kinfe-Michael
Seiko Corp.
Seiko Epson Corp.
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