Telecommunications – Receiver or analog modulated signal frequency converter – Local control of receiver operation
Patent
1993-02-23
1994-08-16
Eisenzopf, Reinhard J.
Telecommunications
Receiver or analog modulated signal frequency converter
Local control of receiver operation
455297, 455307, H04B 110
Patent
active
053394550
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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Arnold Rainer
Bartels Stefan
Schwarz Detlef
Vogt Lothar
Blaupunkt Werke GmbH
Eisenzopf Reinhard J.
Wisler Mark D.
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