Telecommunications – Transmitter and receiver at separate stations – With control signal
Patent
1997-11-18
2000-05-23
Hunter, Daniel S.
Telecommunications
Transmitter and receiver at separate stations
With control signal
455 89, H04B 138
Patent
active
060674474
ABSTRACT:
Information encoded in a radio signal is decoded by tuning an outside receiver to the radio signal, the outside receiver emitting a local signal capable of identifying the radio signal, and arranging a local signal stage of an adapter receiver to detect signals at determined frequencies in a local signal band within which the outside receiver emits the local signal. The adapter receiver is tuned to receive the desired radio signal in response to detection of a local signal at one of the determined frequencies, and information encoded in the radio signal is then decoded. The outside receiver may be a conventional superheterodyne FM radio broadcast receiver that emits local oscillator (LO) signals that are offset in frequency by 10.7 MHz from the frequency of a radio signal to which the receiver is tuned, and the radio signal carries information encoded using a Radio Data System (RDS) standard.
REFERENCES:
patent: 4296391 (1981-10-01), Hazama
patent: 4723302 (1988-02-01), Fulmer et al.
patent: 5214792 (1993-05-01), Alwadish
patent: 5689822 (1997-11-01), Zucker
Hunter Daniel S.
Tran Pablo N.
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