Automatic adaptive filtering according to frequency modulation rate
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United States of America Patent
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Aug 11, 1998
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N/A
app pub date -
Jul 10, 1996
filing date -
Jul 10, 1996
priority date (Note) -
Expired
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Abstract
A transversal adaptive finite impulse response (FIR) filter is modified for automatically filtering modulated signal components from a received signal based on frequency modulation rate. Coefficients of the filter are adapted to provide for filtering of signals having undesired modulation rates. The adapting operation includes selectively updating the coefficients using an error signal and iteratively decaying all the coefficients towards zero. The adaptation of the filter coefficients ensures symmetrical coefficient growth and introduces a constant group delay to the received signal to provide for filtering of complex signal components from a received signal according to frequency modulation rate without the use of a reference source.
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