Pulse or digital communications – Spread spectrum – Direct sequence
Patent
1983-05-09
1986-06-03
Griffin, Robert L.
Pulse or digital communications
Spread spectrum
Direct sequence
1791702, H04S 1500
Patent
active
045933995
ABSTRACT:
In a data communication system involving modems transmitting over a link including terrestrial and one or more satellite links, a nontransmitting modem sends a secondary channel tone during the absence of data transmission. The cessation of said tone is detected by the other modem and used to de-squelch the remote modem receiver. In this manner, the receiver is protected from echoes impinging upon it during long transmission delay times. This method optimizes data throughput by adapting to the transmission delay of the circuit.
REFERENCES:
patent: 3560669 (1971-02-01), Foulkes
patent: 3647993 (1972-03-01), Foulkes et al.
patent: 4177361 (1979-12-01), Birck
patent: 4352962 (1982-10-01), La Mothe
patent: 4355406 (1982-10-01), Guidoux
patent: 4394767 (1983-07-01), Shum
Baugh Charles R.
Dambrackas William A.
Hilpert Edwin J.
Kushin George R.
Park Yoon B.
Chin Stephen
Griffin Robert L.
Miller Jerry A.
Racal Data Communications Inc.
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