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- Notes on the design of optimal
- Notes on the design of optimal
- Introduction to "notes on the
Introduction
A recurring technical task in the development of digital signal processing products and systems
is the design of finite-impulse-response (FIR) digital filters.Fortunately some excellent software packages exist for the automatic
synthesis of impulse responses for such filters, many of them based onthe now-famous Parks-McClellan algorithm [2]. Unfortunately, there is stillsome mystery about how to use the software and, equally important, how to
estimate impulse response lengths short of actually designing the filteritself. This technical note primarily addresses the second problem and
indirectly discusses a bitthe first. We examine here how to convert a typical filter specification in
terms of cutoff frequency, passband ripple, etc., into a reasonablyaccurate estimate of the
length of the impulse response. Not only does this estimate suffice formost design tradeoff exercises, it usually allows the Parks-McClellan routines
to be employed only once or twice rather than the multiple times neededwhen the “cut-and-try" method is used.
Source:
OpenStax, Notes on the design of optimal fir filters. OpenStax CNX. Sep 14, 2009 Download for free at http://cnx.org/content/col10553/1.3
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