Telecommunications – Transmitter and receiver at separate stations – With control signal
Patent
1989-01-24
1991-09-03
Eisenzopf, Reinhard J.
Telecommunications
Transmitter and receiver at separate stations
With control signal
381 13, 381106, 455214, 455259, 455304, 455337, H04B 110, H04B 701, H04H 500
Patent
active
050461290
ABSTRACT:
A receiver for receiving a transmitted signal comprising first and second bandwidth limited component signals modulating a single high frequency carrier in phase quadrature with the first component signal as originally transmitted including an identification signal has a source of a reference signal subject to phase error. Circuitry combines the received transmitted component signals with the reference signal to provide first and second demodulated signals characteristic of the first and second component signals respectively. A detector responds to the first and second demodulated signals to provide first and second detected components of the identification signal. Feedback circuitry responds to the detected components of the identification signal by providing a correction signal that is applied to the source of reference signal to reduce the phase error.
REFERENCES:
patent: 4602380 (1986-07-01), Stebbings
patent: 4752955 (1988-06-01), Torick
patent: 4769841 (1988-09-01), Cugnini
patent: 4771464 (1988-09-01), Kadin et al.
patent: 4809328 (1989-02-01), Usui et al.
patent: 4817151 (1989-03-01), Bod et al.
patent: 4852167 (1989-07-01), Usui et al.
Bose Corporation
Eisenzopf Reinhard J.
Pham Chi H.
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