Functions added - string related and signal processing

3 files changed, 104 insertions, 0 deletions

diff --git a/src/c/signalProcessing/filt_sinc/dfilt_sincs.c b/src/c/signalProcessing/filt_sinc/dfilt_sincs.c
new file mode 100644
index 0000000..65aaaa6
--- /dev/null
+++ b/src/c/signalProcessing/filt_sinc/dfilt_sincs.c
@@ -0,0 +1,58 @@
+/* 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 "filt_sinc.h"
+void dfilt_sincs(double N,double fc,double* oup)
+{
+	double no2=(N-1)/2;
+	int ino2=(int)no2;
+	double wl=fc*2*M_PI;
+	int sz=N;	
+	double xn[sz];
+	double i;
+	int l,m;
+	for(i=-no2;i<=no2;i++)
+	{
+	    l=i+no2;
+	    xn[l]=sin(wl*i);
+	}
+	double xd[sz];
+	double j;
+	printf("\n");
+	for(j=-no2;j<=no2;j++)
+	{
+	    m=j+no2;
+	    xd[m]=M_PI*j;
+	}
+	if(ino2==no2)
+	{
+	xn[(int)no2]=2*fc;
+	xd[(int)no2]=1;
+	}
+	double x[sz];
+	int k;
+	for(k=0;k<N;k++)
+	{
+	oup[k]=xn[k]/xd[k];
+	}
+}
+/*
+int main()
+{
+	int n;
+	double fl;
+	n=5;
+	fl=0.2;
+	filt_sinc(n,fl);
+}
+*/
diff --git a/src/c/signalProcessing/filt_sinc/filt_sinc.h b/src/c/signalProcessing/filt_sinc/filt_sinc.h
new file mode 100644
index 0000000..43b2415
--- /dev/null
+++ b/src/c/signalProcessing/filt_sinc/filt_sinc.h
@@ -0,0 +1,28 @@
+/* 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
+ */
+
+#ifndef __FILT_SINC_H__
+#define __FILT_SINC_H__
+#include "types.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+void u8filt_sincs(int N,double fc,double* oup);
+
+#ifdef __cplusplus
+} /* extern "C" */
+#endif
+
+#endif /* __FILT_SINC_H */
+
diff --git a/src/c/signalProcessing/filt_sinc/int_filt_sinc.h b/src/c/signalProcessing/filt_sinc/int_filt_sinc.h
new file mode 100644
index 0000000..5b7b07a
--- /dev/null
+++ b/src/c/signalProcessing/filt_sinc/int_filt_sinc.h
@@ -0,0 +1,18 @@
+/* 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
+ */
+
+#ifndef __INT_FILT_SINC_H__
+#define __INT_FILT_SINC_H__
+
+#define u80d0filt_sincd2(N,fc,oup) u8filt_sincs(N,fc,oup)
+
+#endif /* !__INT_FILT_SINC_H__! */