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Parks–McClellan filter design algorithm
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<p>The Parks–McClellan algorithm, published by <a href="/facts/James_H._McClellan/4A0vVamL">James McClellan</a> and <a href="/facts/Thomas_W._Parks/al3Fn3an">Thomas Parks</a> in 1972, is an iterative algorithm for finding the optimal Chebyshev <a href="/facts/Finite_impulse_response/5u4Gaqcb">finite impulse response</a> (FIR) <a href="/facts/Digital_filter/2wcxCRdh">filter</a>. The Parks–McClellan algorithm is utilized to design and implement efficient and optimal FIR filters. It uses an indirect method for finding the optimal filter coefficients. </p><p>The goal of the algorithm is to minimize the error in the pass and stop bands by utilizing the Chebyshev approximation. The Parks–McClellan algorithm is a variation of the <a href="/facts/Remez_exchange_algorithm/PcTjtFCs">Remez exchange algorithm</a>, with the change that it is specifically designed for FIR filters. It has become a standard method for FIR filter design. </p>