Classical FIR Filter Design

The classical FIR Design panel (Fig. 2) is used to design FIR filters. These filters include the classic types such as
lowpass, highpass, bandpass, and bandstop and employ the Parks-Mclellan equiripple FIR filter design algorithm.
This panel is very similar to the Classical IIR Design panel and operates in much the same way. The panel includes
a graphical interface with the Magnitude vs Frequency cursors and plot on the left side and a text-based interface with
digital controls on the right side. You design classical FIR filters adjusting the desired filter specifications. The
desired passband and stopband requirements define a filter specification. You define the filter requirements by using
either text entry or the cursors in the Magnitude vs Frequency graph. As the cursors are moved, the text entries are
updated accordingly.