Half bin linear frequency discriminator
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United States of America Patent
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Nov 30, 2010
Grant Date -
Nov 5, 2009
app pub date -
May 4, 2009
filing date -
Feb 25, 2005
priority date (Note) -
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Abstract
Frequency discriminator based on a variant of the DFT transform in which the usual twiddle factors are replaced with twiddle factors as for a DFT on a number of points which is the double as the actual number of sample points. The DFT so modified allows half-bin frequency discrimination, with few added computational burden. Two DFT shifted of half bin with respect to the zero frequency provide a linear response of the discrimination and good immunity to noise. The discriminator is particularly useful in FLL for tracking signals in a GPS receiver.
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