Exchange algorithms that complement the Parks-McClellan algorithm for linear-phase FIR filter design
Ivan Selesnick, C.S. Burrus · IEEE Transactions on Circuits and Systems II Analog and Digital Signal Processing · 1997
The authors describe an exchange algorithm for the frequency domain design of linear-phase FIR equiripple filters where the Chebyshev error in each band is specified. The algorithm is a hybrid of the algorithm of Hofstetter, Oppenheim and Siegel and the Parks-McClellan algorithm. The authors also describe a modification of the Parks-McClellan algorithm where either the passband or the stopband ripple size is specified and the other is minimized.