RemezFirLength Routine

Summary

Estimate the length of an optimal FIR filter.

Declaration

Function RemezFirLength(const W: array of TSample; Ripple: TSample; FilterType: TFilterType; FS: TSample = 2): integer;

Description

Returns the length of the equiripple FIR filter, design with Parks-McClellan algorithm where the maximum allowed ripple of the pass band is Ripple and sampling frequency is FS. The requested stopband attenuation is estimated as 20*Log10(Ripple). The W array holds two or four parameters: the start and the stop of the transition bands, relative to the specified sampling frequency. The maximum filter order is limited with MaxFirLength global variable.

This routine is a simplified version of RemezLength routine.