In a preferred embodiment, a second IF filter (15) does "double duty" as part of the variable-bandwidth filter stage. The comparison stage is programmed with a set of signal difference threshold values and corresponding filter bandwidth values, and controls the filter stage (6, 14) to adjust the bandwidth to the appropriate value, indicated by which signal difference threshold value has been exceeded. It filed for bankruptcy in late 2015 1 with liquidation proceedings completed in early 2016. It was owned by Robert Bosch GmbH from 1933 until 1 March 2009, when it was sold to Aurelius AG of Germany. An improved system, which automatically and dynamically adjusts the bandwidth, employs first and second signal level evaluation circuits (11, 12), a comparison stage (13) which compares their outputs, and a variable-bandwidth filter stage (6, 14) controlled by the comparison stage. Blaupunkt GmbH ( listen (helpinfo)) was a German manufacturer of mostly car audio equipment. However, it is desirable to again broaden the bandwidth once the interference has subsided. It is known to detect such interference and suppress it by narrowing bandwidth in the Intermediate Frequency (IF) signal path. Abstract: FM radio receivers, particularly in moving vehicles, are subject to intermittent adjacent-channel interference.
0 kommentar(er)
