--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/spandsp-0.0.6pre17/src/filter_tools.h	Fri Jun 25 15:50:58 2010 +0200
@@ -0,0 +1,59 @@
+/*
+ * SpanDSP - a series of DSP components for telephony
+ *
+ * filter_tools.h - A collection of routines used for filter design.
+ *
+ * Written by Steve Underwood <steveu@coppice.org>
+ *
+ * Copyright (C) 2008 Steve Underwood
+ *
+ * Based on:
+ * mkshape -- design raised cosine FIR filter
+ * A.J. Fisher, University of York <fisher@minster.york.ac.uk>,  November 1996
+ *
+ * All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1,
+ * as published by the Free Software Foundation.
+ *
+ * This program 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 program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ * $Id: filter_tools.h,v 1.3 2008/04/17 14:26:56 steveu Exp $
+ */
+
+#if !defined(_FILTER_TOOLS_H_)
+#define _FILTER_TOOLS_H_
+
+#if defined(__cplusplus)
+extern "C"
+{
+#endif
+
+void ifft(complex_t data[], int len);
+void apply_hamming_window(double coeffs[], int len);
+void truncate_coeffs(double coeffs[], int len, int bits, int hilbert);
+
+void compute_raised_cosine_filter(double coeffs[],
+                                  int len,
+                                  int root,
+                                  int sinc_compensate,
+                                  double alpha,
+                                  double beta);
+
+void compute_hilbert_transform(double coeffs[], int len);
+
+    
+#if defined(__cplusplus)
+}
+#endif
+
+#endif
+/*- End of file ------------------------------------------------------------*/