Telecommunications – Transmitter and receiver at separate stations
Patent
1986-07-07
1987-02-24
Ng, Jin F.
Telecommunications
Transmitter and receiver at separate stations
455 38, 34082548, 34082552, H04B 700, H04Q 700
Patent
active
046463585
ABSTRACT:
A radio transceiver includes a read only memory (ROM) for storing an origination code and a random access memory (RAM) for storing a destination code. The destination code may be manually entered into the RAM via a keypad or it may be entered remotely from another transceiver. In signalling between two transceivers, the destination code is transmitted followed by the origination code indicating the transmission's origin. In this manner coded squelch communications may take place between two parties without the necessity of reverting to carrier squelch operation while obtaining enhanced user privacy and flexibility.
REFERENCES:
patent: 3644891 (1972-02-01), McCrea
patent: 3766523 (1973-10-01), Brocker et al.
patent: 3944724 (1976-03-01), Kilby et al.
patent: 4284976 (1981-08-01), Gable et al.
patent: 4352955 (1982-10-01), Kai et al.
patent: 4403212 (1983-09-01), Masaki
patent: 4422071 (1983-12-01), de Graaf
patent: 4451827 (1984-05-01), Kahn et al.
patent: 4546467 (1985-10-01), Yamamoto
Motorola publication # R8-1-67 "A Guide to the Golay Sequential Code (GSC)", by Brad Davis.
Motorola Technical Information Bulletin-TT-500 by Dick Fermoyle Jul. 1976, Portable Products "Digital Private-Line" Coded Squelch".
Downey Joseph T.
Motorola Inc.
Ng Jin F.
Nichols Daniel K.
Southard Donald B.
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