Telecommunications – Transmitter and receiver at same station – With transmitter-receiver switching or interaction prevention
Patent
1993-04-19
1994-06-07
Eisenzopf, Reinhard J.
Telecommunications
Transmitter and receiver at same station
With transmitter-receiver switching or interaction prevention
381 34, 375 1, 4552341, H04B 140
Patent
active
053198018
ABSTRACT:
A seamless frequency hopping system utilizes a programmable digital signal processor with interface circuitry in conjunction with a frequency hopping radio to incorporate the concepts of audio time compression, hop by hop automatic gain control and time repeating squelch to improve the sound of frequency hopped analog communication. Incoming uncompressed audio is first sliced into time segments that each correspond to one frequency hop. The uncompressed audio is then compressed to a certain percentage of its original length in time. A dead time as well as a pilot signal is added to the front of the audio. The processed audio signal is then sent to the radio where it is modulated and broadcast. A second radio receives the incoming signal and demodulates it to once again become an audio signal.
REFERENCES:
patent: 4600902 (1986-07-01), Lafferty
patent: 5029182 (1991-07-01), Cai et al.
patent: 5109525 (1992-04-01), Nichols
Hand Rex A.
Richey Manuel F.
Stephens G. Byron
Allied-Signal Inc.
Eisenzopf Reinhard J.
Massung Howard G.
Paschburg Donald B.
Pham Chi H.
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