Kennard White is the author of X-pole, an interactive analog and digital filter design program. X-pole supports classical analog/digital IIR filter design techniques, pole-zero placement, proportional-integral-differential (PID) feedback control filters, window-based digital FIR filter design, and Parks-McClellan digital FIR filter design. X-pole is a combination of Tcl/Tk code and C routines written by Kennard White.

X-pole is currently not supported by the Ptolemy Group.

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