Pulse or digital communications – Transceivers – Transmission interface between two stations or terminals
Patent
1997-10-23
2000-09-05
Vo, Don N.
Pulse or digital communications
Transceivers
Transmission interface between two stations or terminals
375222, H04B 138
Patent
active
061154148
ABSTRACT:
A known system having a transceiver device (such as a radiotelephone or walkie-talkie) for the transmission and reception of speech information via a speech channel in a wireless manner is only able to transmit and receive short data messages via an organization channel, switching means present in the transceiver device determining the channel with which the transceiver is coupled through. As a result of expanding the system with a modulator/demodulator, it can transmit and receive large quantities of data via the speech channel, an increased efficiency of the system being obtained by triggering the switching means from the modulator/demodulator device.
REFERENCES:
patent: 4912756 (1990-03-01), Hop
patent: 4972457 (1990-11-01), O'Sullivan
patent: 5127041 (1992-06-01), O'Sullivan
patent: 5345600 (1994-09-01), Davidson
patent: 5479480 (1995-12-01), Scott
patent: 5513213 (1996-04-01), Patel et al.
Koninklijke PTT Nederland N.V.
Michaelson Peter L.
Vo Don N.
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