Telecommunications – Transmitter and receiver at separate stations – Frequency or phase modulation
Patent
1990-04-02
1992-12-08
Eisenzopf, Reinhard J.
Telecommunications
Transmitter and receiver at separate stations
Frequency or phase modulation
455 674, 455103, 455295, H04B 1700
Patent
active
051704862
ABSTRACT:
Apparatus for synthesising a composite signal (53) which has spaced first and second frequency channels of which each has an independently predetermined power, the power of the first channel being substantially below that of the second, and each channel being frequency modulated by an independent signal, the apparatus including a generator (51) responsive to the independent signals and to representations of the said powers and to the channel spacing to generate a composite modulation signal, and a single, high purity radio frequency source (52) connected for modulation by the output of the composite modulation signal-generating generator to produce the composite signal (53).
REFERENCES:
patent: 2233183 (1941-02-01), Roder
patent: 2675540 (1954-04-01), Schultheis et al.
patent: 3623105 (1971-11-01), Kamen
patent: 4110708 (1978-08-01), Mendenhall
patent: 4130811 (1978-12-01), Katz et al.
patent: 4806881 (1989-02-01), Ives et al.
patent: 4918684 (1990-04-01), Boschet et al.
Electro. No. 76, 1976, Los Angeles, U.S., pp. 1-6, W. H. Hayward: "Modern trends in communication receiver design-an overview".
Eisenzopf Reinhard J.
Marconi Instruments Limited
Urban Edward
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