Telecommunications – Receiver or analog modulated signal frequency converter – Carrier and single sideband
Patent
1979-04-02
1982-03-16
Bookbinder, Marc E.
Telecommunications
Receiver or analog modulated signal frequency converter
Carrier and single sideband
328 15, 329154, 363177, 455118, H04B 126
Patent
active
043205313
ABSTRACT:
A frequency conversion system, including a time shared frequency converter and a time shared band limited amplification system, whereby a plurality of information bearing signals are commonly obtained, determined, filtered and amplified over a single path. The process admits signals whose carriers are separated by frequency or phase, and whose amplitudes are different.
Synchronous and asynchronous receivers which ordinarily require dual mixers, filters and amplifiers are simplified by this invention. Phase locked loop demodulators, including AM, DSSC and Costas loop demodulators, which ordinarily require a pair of phase detectors, filters and amplifiers to generate the in-phase and quadrature-phase channels are simplified by this invention. The use of a common path for the in-phase and quadrature-phase channels also permits the close matching of gain and frequency response in each channel.
Where a plurality of signals having diverse amplitudes are to be commonly processed herein, this invention permits selective automatic gain control by regulating the relative time each such signal is applied to the common path.
REFERENCES:
patent: 2637808 (1953-05-01), Herrick
patent: 2715179 (1955-08-01), Cornet
patent: 3370128 (1968-02-01), Morita et al.
patent: 3414821 (1968-12-01), Bickers et al.
patent: 3614627 (1971-10-01), Runyan et al.
patent: 3665507 (1972-05-01), Peil
Bookbinder Marc E.
Free Albert L.
Lindrooth Charles H.
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