FM data-system radio receiver
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United States of America Patent
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-
Apr 9, 1996
Grant Date -
N/A
app pub date -
May 16, 1994
filing date -
May 16, 1994
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
An FM stereo radio data-system receiver has a front end including an FM discriminator that produces a composite signal composed of an AM stereo signal, including a 19 KHz pilot, and an AM digital-data signal. A dual-bandwidth phase locked loop (PLL) locks onto the pilot and serves both, as the decoder of the stereo portion of the composite signal, and as a generator of a strong stable 38 KHz carrier for use in regenerating the bit rate clock signal and for decoding the data-symbol signal of the digital-data portion of the composite signal. Advantages include economy of circuitry, a simpler and less costly high pass filter, and greater reliability in the decoding of the data signal.
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