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The Asymptotics of Optimal (Equiripple) Filters (1999)  (Make Corrections)  
Jianhong Shen, Gilbert Strang
IEEE Trans. Signal Processing



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Interpret and improve the 25-year mysterious empirical formula of Kaiser (Bell Lab) in optimal filter design

Abstract: fFor equiripple filters, the relation among the filter length N +1, the transition bandwidth 1!, and the optimal passband and stopband errors ffi p and ffi s has been a secret for more than 20 years. This paper is aimed at solving this mystery. We derive the exact asymptotic results in the weightfree case ffi p = ffi s = ffi, which enables us to interpret and improve the existing empirical formulas. Our main results are finally combined into formula (17). In the transition band, the filter... (Update)

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BibTeX entry:   (Update)

@misc{ shen-asymptotics,
  author = "Jianhong Shen and Gilbert Strang",
  title = "The Asymptotics of Optimal (Equiripple) Filters",
  journal = "IEEE Trans. Signal Processing",
  volume =" 47(4)",
  pages ="1087-1098",
  year ="1999",
  url = "citeseer.ist.psu.edu/shen99asymptotics.html" }
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