Pulse or digital communications – Repeaters – Testing
Patent
1983-11-22
1986-03-04
Brown, Thomas W.
Pulse or digital communications
Repeaters
Testing
375 21, H04Q 704
Patent
active
045741638
ABSTRACT:
A two-way digital radio telephone system includes means for transmitting by RF carrier 16 bit binary words including a start bit, a six bit identification code and eight bits of information comprising either an audio sample or a function code, as indicated by an audio/function bit. The carrier is detected and each word serially loaded into a receive shift register which is parallelly unloaded with the identification code being supplied to a comparator and the information data being supplied to a D/A converter. If the comparator yields an identity with the predetermined 6 bit identification code, a D/A converter output is supplied to an amplifier which feeds a conventional telephone coil. The signal is retransmitted on another carrier by a parallelly loaded and serially unloaded transmit shift register which generates a similar binary word including an identification code, digitized audio or function data and the appropriate audio/function bit.
REFERENCES:
patent: 4171513 (1979-10-01), Otey et al.
patent: 4179657 (1979-12-01), Hobbs
patent: 4467141 (1984-08-01), Resch et al.
Electronics, vol. 49, No. 15, Jul. 22, 1976, pp. 8E, 10E, "Marconi Introduces Digital Family for Encrypting Civilian Transmissions".
IBM Technical Disclosure Bulletin, vol. 21, No. 5, Oct. 1978, pp. 2156-2157, Waldbaum, "Cryptographic Voice Communications Using Digital Data Processing Devices".
Intelcon 79 Exposition Proceedings, Feb. 26-Mar. 2, 1979, pp. 10-13, deLellis, "Linear Prediction Techniques for Digital Secure Voice Systems."
Brady W. J.
Brown Thomas W.
Zenith Electronics Corporation
LandOfFree
Digital radio telephone does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Digital radio telephone, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Digital radio telephone will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1594949