FM signal quality detector during seek
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United States of America Patent
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Dec 10, 2002
Grant Date -
N/A
app pub date -
Sep 16, 1996
filing date -
May 15, 1996
priority date (Note) -
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Abstract
A vehicle radio includes a microprocessor-controlled tuner having a seek function. The tuner generates a station detect signal when a sufficiently strong signal is received, and the tuner also generates a multipath detect signal when a received signal exhibits undesirable multipath or adjacent channel conditions. To avoid ending the seek function when a relatively strong but poor-quality sideband signal is received, the microprocessor waits about 200 milliseconds after the station detect signal is generated, then determines whether the multipath detect signal is present, and if so, allows the seek to continue. On the other hand, the multipath detect signal can be expected to indicate that no multipath conditions exist (and, hence, that a good station signal exists) about 200 milliseconds after receipt of a good station signal, in which case the seek is terminated.
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