1 files changed, 49 insertions, 0 deletions
diff --git a/src/c/signalProcessing/cheb2mag/dcheb2mags.c b/src/c/signalProcessing/cheb2mag/dcheb2mags.c
new file mode 100644
index 0000000..006c591
--- /dev/null
+++ b/src/c/signalProcessing/cheb2mag/dcheb2mags.c
@@ -0,0 +1,49 @@
+/* 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 "cheb2mag.h"
+void dcheb2mags(double n,double omegar, double A, double* sample,int size,double* oup)
+{
+	double e;
+	//e=sqrt(A*A-1);
+	e=1/(pow(10,A/10)-1);
+	double x,k,cn,h,tp;
+	int i;
+	for(i=0;i<size;i++)
+	{
+            x=omegar/sample[i];
+	    if(x<=1)
+	    {
+	        tp=acos(x);
+		cn=cos(n*tp);
+	        if(x==1)
+	        {
+	        h=1/(1+A*A-1);
+		}
+		else
+		{
+	        h=1/(1+((A*A-1)/(cn*cn)));
+		}
+	
+	    }
+	    else
+	    {  
+	        tp=acosh(x);
+		cn=cosh(n*tp);
+		h=e*(cn*cn)/(1+e*(cn*cn));
+	
+	    }
+	oup[i]=h;
+	}
+}
+