Desensitized filters
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United States of America Patent
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Feb 4, 2014
Grant Date -
Apr 22, 2010
app pub date -
Aug 1, 2008
filing date -
Aug 1, 2007
priority date (Note) -
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Abstract
A method and system for the design and implementation of filters is presented in which the filter's transfer function can be provided with a significant insensitivity to the filter's tap coefficient values. A desensitized digital filter includes a first halfband filter and a second filter coupled in cascade between an input of the digital filter and the output of the digital filter. In embodiments, the first filter has the transfer function F(z)=K(1+z−1)(1+z−1) wherein K≠0 is a scale factor. The digital filter may also interact with an up-sampler or a down-sampler. A desensitized Hilbert transformer includes an FIR filter having filter-tap coefficients whose absolute values equal the absolute values of the coefficients of an FIR filter F(z) for which the product (1+z−1)F(z) is a halfband filter coupled in cascade with a second filter.
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