Radio receiver adjacent-channel interference suppression circuit
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United States of America Patent
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-
Aug 16, 1994
Grant Date -
N/A
app pub date -
Feb 23, 1993
filing date -
Mar 18, 1992
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A mobile radio receiver, for example, a car radio, needs a circuit to detect and suppress adjacent-channel interference. This can be done by using bandpass filters (14) of differing bandwidth. The present invention dynamically adjusts bandwidth to an optimum value by continuously comparing (13) a first signal level, upstream of the bandpass filter, to a second signal level, downstream of the bandpass filter, to derive a difference value representative of adjacent-channel interference, then uses an electronically controlled selector switch (6) to select a particular filter (14.sub.N) whose bandwidth is sufficiently narrow to cut out the interfering broadcast signal. A table associating each magnitude range of interference with a particular filter bandwidth assures that bandwidth is broadened as interference diminishes, thereby assuring sufficient reception signal strength.
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