G - Physics – 01 – R
Patent
G - Physics
01
R
328/114, 324/37,
G01R 23/16 (2006.01)
Patent
CA 1277721
METHOD AND APPARATUS FOR DETECTING A NARROWBAND SIGNAL Abstract of the Disclosure In a method and apparatus for discriminating between a broadband unipolar signal having a component within one or more of three predetermined frequency bands and a narrowband signal within one of the frequency bands, a signal under test is amplified by a gain which is inversely proportional to the DC content of the signal under test to normalize the signal under test. The normalized signal is bandpass filtered to attenuate components outside of the predetermined frequency bands and the filtered signal is compared to a reference signal. The signal under test is deemed to be a narrowband signal within one of the predetermined frequency bands if the filtered signal exceeds the reference signal. The method and apparatus are particularly useful for detecting test tones on optical fibers.
556375
Junkin Charles William
Nortel Networks Limited
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