Both analog and digital filters pass signals in a specified frequency range and attenuate signals outside that range. But digital filters operate on discrete data–that is, sampled data in digital form, obtained either from stored data of any kind retrieved in the form of a time series or from conversions of electrical signals to digital by an a/d converter. Read full article
Speeding up FIR Filters (Making the FIR Fly)
When Coefficients Exist in Symmetric or Antisymmetric Pairs; Symmetry Can Be Used to Speed up Computation by Factors of 2
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