zlpf

 

	while(IT_IN(0))
	{
		if(IT_OUT(0)) {
			KrnOverflow("zlpf",0);
			return(99);
		}
		out(0)=pole*out(1)+(1.0-pole)*in(0);
	}

/*  Capsim (r) Text Mode Kernel (TMK) Star Library (Blocks)
    Copyright (C) 1989-2002  XCAD Corporation 

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public
    License as published by the Free Software Foundation; either
    version 2.1 of the License, or (at your option) any later version.

    This library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public
    License along with this library; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

    http://capsimtmk.sourceforge.net
    XCAD Corporation
    Raleigh, North Carolina */

 

/************************************************************************
 *									*
 *	zlpf.s:		low pass filter					*
 *									*
 *	parameters:	pole, pole of the IIR filter			*
 *									*
 *	inputs:		in, the signal to be filtered			*
 *									*
 *	outputs:	out, the filtered signal			*
 *									*
 *	description:	This star implements an IIR filter as a 	*
 *			recursive equation:				*
 *			y(n)=pole*y(n-1)+(1-pole)*x(n)			*
 *			This implementation produces unity gain at DC.	*
 *									*
 *									*
 *			written by John T. Stonick			*
 *									*






 ************************************************************************/