Telecommunications – Carrier wave repeater or relay system – Plural modulated carriers
Patent
1980-12-11
1982-12-07
Chin, Tommy P.
Telecommunications
Carrier wave repeater or relay system
Plural modulated carriers
455 22, 455 61, 375 3, H04B 716
Patent
active
043631290
ABSTRACT:
Simulcast distortion in a receiver when using a same-frequency repeater is minimized by applying double modulation to a signal that is broadcast to the same-frequency repeater. A voice signal is applied without delay as AM on a carrier to a modulation index of up to 30%, and the same signal is also applied as FM on the same carrier with a time delay equal to the time delay in the same-frequency repeater. The same-frequency repeater detects the AM and applies the detected signal as FM on a carrier that is rebroadcast. Received FM signals are thus delayed by substantially the same amount whether they are received from the original broadcast or the same-frequency repeater.
REFERENCES:
patent: 3069679 (1962-12-01), Sweeney et al.
patent: 3085200 (1963-04-01), Goodall
patent: 3086080 (1963-04-01), Raisbeck
patent: 3681695 (1972-08-01), Cease et al.
patent: 3860870 (1975-01-01), Furuya
patent: 3979683 (1976-09-01), Ikeda
Cohn Jona
Davidson Allen L.
Van den Heuvel Anthony P.
Chin Tommy P.
Gillman James W.
Motorola Inc.
Reynolds Donald P.
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