Arrangement having tracking IF filter
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United States of America Patent
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Oct 27, 1992
Grant Date -
N/A
app pub date -
Oct 16, 1989
filing date -
Apr 15, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In an FM receiver where the center frequency of an IF filter is varied depending on the received signal, an arrangement is described in which the passband of the retuned IF filter is selected so that a distinct resonance region having a relatively steep-edged drop of at least 6 dB exists in the middle of the channel; a less steep or level curve exists in a region essentially symmetrically spaced from the middle of the channel on both sides of the resonance region; and the pass limits lie essentially in symmetry with the middle of the channel.
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