Frequency modulation receiver in particular for an RDS application
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United States of America Patent
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-
Mar 9, 2004
Grant Date -
N/A
app pub date -
Sep 20, 2000
filing date -
Oct 6, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
There is described an FM receiver (29) including; an antenna (2) able to receive a high frequency signal from a transmitter; a high frequency stage (3); an oscillator (5); a mixer unit (30) able to provide a signal (S6) at an intermediate frequency (f.sub.IF); an FM demodulation stage (8); and an automatic frequency control stage (36) able to control the oscillator, so as to keep said intermediate frequency (f.sub.IF) of said signal (S6) constant. This receiver further includes a locked loop (32) arranged to enslave said intermediate frequency (f.sub.IF) from a pilot frequency (fp) present in the demodulated signal. One advantage of such a locked loop is that the intermediate frequency is enslaved so that the aliasing phenomenon does not prevent demodulation of the signals containing the RDS data.
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