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The third major approximation criterion uses some measure of the smoothness or flatness of the frequency response. Work has been done by Herrmann [link] , P. P. Vaidyanathan, and Selesnick and Burrus [link] , [link] , [link] , [link] . This approach is related to how polynomial signals are processed andmay be related to zero moments in wavelet systems.
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OpenStax, Digital signal processing and digital filter design (draft). OpenStax CNX. Nov 17, 2012 Download for free at http://cnx.org/content/col10598/1.6
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