Telecommunications – Receiver or analog modulated signal frequency converter – Plural receivers
Patent
1980-03-17
1983-09-20
Chin, Tommy P.
Telecommunications
Receiver or analog modulated signal frequency converter
Plural receivers
455139, 455141, 455273, 329122, H04B 708
Patent
active
044060173
ABSTRACT:
The stability of reception of information signals in a low-quality radio communication circuit is notably improved by a method and apparatus of diversity reception which, by means of the local oscillation frequencies of a plurality of receiving systems, permits one or more coherently interrelated received signals to be phase-locked in the phase-lock loops of the respective receiving systems and which, when any of the phase-lock loops has accidentally lost the phase-lock of the received signals, enables the lost phase-lock loop to resume normal phase-lock by borrowing and using, as its own local oscillation frequency, the local oscillation frequency of the phase-lock loop of one of the remaining receiving systems still locking the phases of the received signals.
REFERENCES:
patent: 2691726 (1954-10-01), Leypold
patent: 2951152 (1960-08-01), Sichak
patent: 2955199 (1960-10-01), Mindes
patent: 3195049 (1965-07-01), Altman
patent: 3348152 (1967-10-01), Laughlin
patent: 3614625 (1971-10-01), Mayle
patent: 3626426 (1970-12-01), Steinberg
patent: 3743941 (1973-07-01), Gans
Chin Tommy P.
Radio Research Laboratories Ministry of Posts & Telecommunicatio
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