1 files changed, 63 insertions, 0 deletions
diff --git a/2.3-1/src/c/signalProcessing/zpch2/dzpch2s.c b/2.3-1/src/c/signalProcessing/zpch2/dzpch2s.c
new file mode 100644
index 00000000..22a46a64
--- /dev/null
+++ b/2.3-1/src/c/signalProcessing/zpch2/dzpch2s.c
@@ -0,0 +1,63 @@
+/* Copyright (C) 2017 - IIT Bombay - FOSSEE
+
+ This file must be used under the terms of the CeCILL.
+ This source file is licensed as described in the file COPYING, which
+ you should have received as part of this distribution.  The terms
+ are also available at
+ http://www.cecill.info/licences/Licence_CeCILL_V2-en.txt
+ Author: Ankit Raj
+ Organization: FOSSEE, IIT Bombay
+ Email: toolbox@scilab.in
+ */
+#include<stdio.h>
+#include<math.h>
+#include "zpch2.h"
+#include "multiplication.h"
+#include "abs.h"
+#include "division.h"
+#define PI 3.14159265
+double dzpch2s(double N, double A, double omegar,doubleComplex* zeros,doubleComplex* poles) 
+{
+	int k,j;
+	double e,xk,realVal,gain;
+	doubleComplex accumulate1,accumulate2,tp1,tp2;
+	accumulate1=DoubleComplex(1,0);	
+	accumulate2=DoubleComplex(1,0);
+	int ct=0;
+	for(k=1;k<=N;k++)
+	{
+	if(k!=((N+1)/2))
+	{
+	ct++;
+	double num=PI*(2*k-1);
+	double den=2*N;
+	 xk=cos(num/den);
+	double sk=omegar/xk;
+	zeros[k-1]=DoubleComplex(0,sk);
+	tp1=DoubleComplex(0,sk);
+	accumulate1=zmuls(accumulate1,tp1);
+	}	
+	}
+	for(j=1;j<=N;j++)
+	{
+	double num=PI*(2*j-1);
+	double den=2*N;
+	double xk1=num/den;
+	double Gamma=pow((A+sqrt(A*A-1)),(1/N));
+	double alpha=-((Gamma-1/Gamma)/2)*sin(xk1);
+    	double Beta=((Gamma+1/Gamma)/2)*cos(xk1);
+    	double normal=alpha*alpha+Beta*Beta;
+    	poles[j-1]=DoubleComplex((omegar*alpha)/normal,(omegar*Beta)/normal);
+	tp2=DoubleComplex((omegar*alpha)/normal,(omegar*Beta)/normal);
+	accumulate2=zmuls(accumulate2,tp2);
+	}
+	double qt;
+	double ra2=zreals(accumulate2);
+	double ra1=zreals(accumulate1);	
+	qt=dldivs(ra1,ra2);
+	gain=dabss(qt);
+	
+	return gain;
+	
+}
+