Telecommunications – Receiver or analog modulated signal frequency converter – Plural receivers
Patent
1982-03-18
1984-05-22
Ng, Jin F.
Telecommunications
Receiver or analog modulated signal frequency converter
Plural receivers
455137, 455303, H04B 116, H04B 702
Patent
active
044505850
ABSTRACT:
A signal switch and combining system for a radio communication system having two receivers (R.sub.A, R.sub.B) includes a comparator operable to determine which of the receiver output signal to noise ratios is the greatest at any instant. There is also a threshold detector arranged to determine when the difference between the two signal to noise ratios exceeds any one or more of a number of predetermined threshold levels. A gating network (GN) responds to the outputs of the comparator and threshold detector (CT) to control a switching and impedance network SZ. This controls the connection of ratio signals from the two receivers (R.sub.A, R.sub.B) to an output load. The network is arranged to connect to the load either one of the two radio signals or a combination of the two signals in one of a number of predetermined ratios. The signal to noise ratios of the two receiver output signals are conveniently indicated by the receiver automatic gain control signals.
REFERENCES:
patent: 3293607 (1966-12-01), Kalbfell
patent: 4246655 (1981-01-01), Parker
Ferranti plc
Ng Jin F.
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