Added basic wavelet classifier blocks. GSL is now a prerequisite for

gnuradio-core.  Merged from eb/frank -r9627:9868 to trunk.


git-svn-id: http://gnuradio.org/svn/gnuradio/trunk@9870 221aa14e-8319-0410-a670-987f0aec2ac5

17 files changed, 924 insertions, 0 deletions

diff --git a/gnuradio-core/src/lib/general/Makefile.am b/gnuradio-core/src/lib/general/Makefile.am
index b46590070..7d486092a 100644
--- a/gnuradio-core/src/lib/general/Makefile.am
+++ b/gnuradio-core/src/lib/general/Makefile.am
@@ -125,6 +125,7 @@ libgeneral_la_SOURCES = 		\
 	gr_pwr_squelch_cc.cc		\
 	gr_pwr_squelch_ff.cc		\
 	gr_quadrature_demod_cf.cc	\
+	gr_rail_ff.cc			\
 	gr_random.cc			\
 	gr_regenerate_bb.cc		\
 	gr_remez.cc			\
@@ -137,6 +138,7 @@ libgeneral_la_SOURCES = 		\
 	gr_simple_framer.cc		\
 	gr_simple_squelch_cc.cc		\
 	gr_skiphead.cc			\
+	gr_squash_ff.cc			\
 	gr_squelch_base_cc.cc		\
 	gr_squelch_base_ff.cc		\
 	gr_stream_mux.cc		\
@@ -144,6 +146,7 @@ libgeneral_la_SOURCES = 		\
 	gr_stream_to_vector.cc		\
 	gr_streams_to_stream.cc		\
 	gr_streams_to_vector.cc		\
+	gr_stretch_ff.cc		\
         gr_test.cc                      \
 	gr_threshold_ff.cc		\
 	gr_throttle.cc			\
@@ -151,6 +154,8 @@ libgeneral_la_SOURCES = 		\
 	gr_vco_f.cc			\
 	gr_vector_to_stream.cc		\
 	gr_vector_to_streams.cc		\
+	gr_wavelet_ff.cc		\
+	gr_wvps_ff.cc			\
 	gri_add_const_ss_generic.cc	\
 	gri_char_to_float.cc		\
 	gri_debugger_hook.cc		\
@@ -275,6 +280,7 @@ grinclude_HEADERS = 			\
 	gr_pwr_squelch_cc.h		\
 	gr_pwr_squelch_ff.h		\
 	gr_quadrature_demod_cf.h	\
+	gr_rail_ff.h			\
 	gr_random.h			\
 	gr_regenerate_bb.h		\
 	gr_remez.h			\
@@ -287,6 +293,7 @@ grinclude_HEADERS = 			\
 	gr_simple_framer.h		\
 	gr_simple_framer_sync.h		\
 	gr_simple_squelch_cc.h		\
+	gr_squash_ff.h			\
 	gr_skiphead.h			\
 	gr_squelch_base_cc.h		\
 	gr_squelch_base_ff.h		\
@@ -295,6 +302,7 @@ grinclude_HEADERS = 			\
 	gr_stream_to_vector.h		\
 	gr_streams_to_stream.h		\
 	gr_streams_to_vector.h		\
+	gr_stretch_ff.h			\
         gr_test_types.h			\
         gr_test.h			\
 	gr_threshold_ff.h		\
@@ -304,6 +312,8 @@ grinclude_HEADERS = 			\
 	gr_vco_f.h			\
 	gr_vector_to_stream.h		\
 	gr_vector_to_streams.h		\
+	gr_wavelet_ff.h			\
+	gr_wvps_ff.h			\
 	gri_add_const_ss.h		\
 	gri_agc_cc.h			\
 	gri_agc_ff.h			\
@@ -427,6 +437,7 @@ swiginclude_HEADERS =			\
 	gr_pwr_squelch_cc.i		\
 	gr_pwr_squelch_ff.i		\
 	gr_quadrature_demod_cf.i	\
+	gr_rail_ff.i			\
 	gr_regenerate_bb.i		\
 	gr_remez.i			\
 	gr_rms_cf.i			\
@@ -437,6 +448,7 @@ swiginclude_HEADERS =			\
 	gr_simple_framer.i		\
 	gr_simple_squelch_cc.i		\
 	gr_skiphead.i			\
+	gr_squash_ff.i			\
 	gr_squelch_base_cc.i		\
 	gr_squelch_base_ff.i		\
 	gr_stream_mux.i			\
@@ -444,6 +456,7 @@ swiginclude_HEADERS =			\
 	gr_stream_to_vector.i		\
 	gr_streams_to_stream.i		\
 	gr_streams_to_vector.i		\
+	gr_stretch_ff.i			\
         gr_test.i			\
 	gr_threshold_ff.i		\
 	gr_throttle.i			\
@@ -452,6 +465,8 @@ swiginclude_HEADERS =			\
 	gr_vector_to_stream.i		\
 	gr_vector_to_streams.i		\
 	gr_unpack_k_bits_bb.i		\
+	gr_wavelet_ff.i			\
+	gr_wvps_ff.i			\
 	gri_agc_cc.i			\
 	gri_agc_ff.i			\
 	gri_agc2_cc.i			\
diff --git a/gnuradio-core/src/lib/general/general.i b/gnuradio-core/src/lib/general/general.i
index 542bf6064..e7d9e978e 100644
--- a/gnuradio-core/src/lib/general/general.i
+++ b/gnuradio-core/src/lib/general/general.i
@@ -133,6 +133,12 @@
 #include <gr_scrambler_bb.h>
 #include <gr_probe_mpsk_snr_c.h>
 #include <gr_probe_density_b.h>
+#include <gr_rail_ff.h>
+#include <gr_squash_ff.h>
+#include <gr_stretch_ff.h>
+#include <gr_wavelet_ff.h>
+#include <gr_wvps_ff.h>
+
 %}
 
 %include "gr_nop.i"
@@ -246,3 +252,8 @@
 %include "gr_scrambler_bb.i"
 %include "gr_probe_mpsk_snr_c.i"
 %include "gr_probe_density_b.i"
+%include "gr_rail_ff.i"
+%include "gr_squash_ff.i"
+%include "gr_stretch_ff.i"
+%include "gr_wavelet_ff.i"
+%include "gr_wvps_ff.i"
diff --git a/gnuradio-core/src/lib/general/gr_rail_ff.cc b/gnuradio-core/src/lib/general/gr_rail_ff.cc
new file mode 100644
index 000000000..9fd3af8df
--- /dev/null
+++ b/gnuradio-core/src/lib/general/gr_rail_ff.cc
@@ -0,0 +1,62 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2004 Free Software Foundation, Inc.
+ * 
+ * This file is part of GNU Radio
+ * 
+ * GNU Radio is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3, or (at your option)
+ * any later version.
+ * 
+ * GNU Radio 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 General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with GNU Radio; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <gr_rail_ff.h>
+#include <gr_io_signature.h>
+
+gr_rail_ff_sptr
+gr_make_rail_ff(float lo, float hi)
+{
+  return gr_rail_ff_sptr(new gr_rail_ff(lo, hi));
+}
+
+gr_rail_ff::gr_rail_ff(float lo, float hi)
+  : gr_sync_block("rail_ff",
+		  gr_make_io_signature(1, 1, sizeof(float)),
+		  gr_make_io_signature(1, 1, sizeof(float))),
+    d_lo(lo), d_hi(hi)
+{
+}
+
+int
+gr_rail_ff::work(int noutput_items,
+		 gr_vector_const_void_star &input_items,
+		 gr_vector_void_star &output_items)
+{
+  const float *in  = (const float *) input_items[0];
+  float       *out = (float *) output_items[0];
+  
+  for (int i = 0; i < noutput_items; i++) {
+    if (in[i] < d_lo)
+      out[i] = d_lo;
+    else if (in[i] > d_hi)
+      out[i] = d_hi;
+    else
+      out[i] = in[i];
+  }
+
+  return noutput_items;
+}
diff --git a/gnuradio-core/src/lib/general/gr_rail_ff.h b/gnuradio-core/src/lib/general/gr_rail_ff.h
new file mode 100644
index 000000000..d9e19a964
--- /dev/null
+++ b/gnuradio-core/src/lib/general/gr_rail_ff.h
@@ -0,0 +1,56 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2004 Free Software Foundation, Inc.
+ * 
+ * This file is part of GNU Radio
+ * 
+ * GNU Radio is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3, or (at your option)
+ * any later version.
+ * 
+ * GNU Radio 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 General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with GNU Radio; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifndef   	INCLUDED_GR_RAIL_FF_H_
+# define   	INCLUDED_GR_RAIL_FF_H_
+
+#include <gr_sync_block.h>
+
+/*!
+ * \brief clips input values to min, max
+ * \ingroup misc
+ */
+
+class gr_rail_ff;
+typedef boost::shared_ptr<gr_rail_ff> gr_rail_ff_sptr;
+
+gr_rail_ff_sptr gr_make_rail_ff(float lo, float hi);
+
+class gr_rail_ff : public gr_sync_block
+{
+  friend gr_rail_ff_sptr gr_make_rail_ff (float lo, float hi);
+
+  float	d_lo, d_hi;		// the constant
+  gr_rail_ff(float lo, float hi);
+
+ public:
+  float lo() const { return d_lo; }
+  void set_lo(float lo) { d_lo = lo; }
+  float hi() const { return d_hi; }
+  void set_hi(float hi) { d_hi = hi; }
+
+  int work(int noutput_items,
+	   gr_vector_const_void_star &input_items,
+	   gr_vector_void_star &output_items);
+};
+
+#endif
diff --git a/gnuradio-core/src/lib/general/gr_rail_ff.i b/gnuradio-core/src/lib/general/gr_rail_ff.i
new file mode 100644
index 000000000..ae39b76de
--- /dev/null
+++ b/gnuradio-core/src/lib/general/gr_rail_ff.i
@@ -0,0 +1,30 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2008 Free Software Foundation, Inc.
+ * 
+ * This file is part of GNU Radio
+ * 
+ * GNU Radio is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3, or (at your option)
+ * any later version.
+ * 
+ * GNU Radio 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 General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+GR_SWIG_BLOCK_MAGIC(gr,rail_ff);
+
+gr_rail_ff_sptr gr_make_rail_ff(float lo, float hi);
+
+class gr_rail_ff : public gr_sync_block
+{
+private:
+  gr_rail_ff(float lo, float hi);
+};
diff --git a/gnuradio-core/src/lib/general/gr_squash_ff.cc b/gnuradio-core/src/lib/general/gr_squash_ff.cc
new file mode 100644
index 000000000..977376bc5
--- /dev/null
+++ b/gnuradio-core/src/lib/general/gr_squash_ff.cc
@@ -0,0 +1,93 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2004 Free Software Foundation, Inc.
+ * 
+ * This file is part of GNU Radio
+ * 
+ * GNU Radio is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3, or (at your option)
+ * any later version.
+ * 
+ * GNU Radio 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 General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with GNU Radio; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <stdexcept>
+#include <gr_squash_ff.h>
+#include <gr_io_signature.h>
+
+// expect input vector of igrid.size y-values,
+// produce output vector of ogrid.size y-values
+
+gr_squash_ff_sptr
+gr_make_squash_ff(const std::vector<float> &igrid,
+		  const std::vector<float> &ogrid)
+{
+  return gr_squash_ff_sptr(new gr_squash_ff(igrid, ogrid));
+}
+
+gr_squash_ff::gr_squash_ff(const std::vector<float> &igrid,
+			   const std::vector<float> &ogrid)
+  : gr_sync_block("squash_ff",
+		  gr_make_io_signature(1, 1, sizeof(float) * igrid.size()),
+		  gr_make_io_signature(1, 1, sizeof(float) * ogrid.size()))
+{
+  d_inum  = igrid.size();
+  d_onum  = ogrid.size();
+  d_igrid = (double *) malloc(d_inum * sizeof(double));
+  d_iwork = (double *) malloc(d_inum * sizeof(double));
+  d_ogrid = (double *) malloc(d_onum * sizeof(double));
+  for (int i = 0; i < d_inum; i++)
+    d_igrid[i] = igrid[i];
+  for (int i = 0; i < d_onum; i++)
+    d_ogrid[i] = ogrid[i];
+
+  d_accel = gsl_interp_accel_alloc();
+  d_spline = gsl_spline_alloc(gsl_interp_cspline, d_inum);	// FIXME check w/ Frank
+}
+
+gr_squash_ff::~gr_squash_ff()
+{
+  free((char *) d_igrid);
+  free((char *) d_iwork);
+  free((char *) d_ogrid);
+  gsl_interp_accel_free(d_accel);
+  gsl_spline_free(d_spline);
+}
+
+int
+gr_squash_ff::work(int noutput_items,
+		    gr_vector_const_void_star &input_items,
+		    gr_vector_void_star &output_items)
+{
+  const float *in  = (const float *) input_items[0];
+  float       *out = (float *) output_items[0];
+
+  for (int count = 0; count < noutput_items; count++) {
+
+    for (int i = 0; i < d_inum; i++)
+      d_iwork[i] = in[i];
+
+    gsl_spline_init(d_spline, d_igrid, d_iwork, d_inum);
+    
+    for (int i = 0; i < d_onum; i++)
+      out[i] = gsl_spline_eval(d_spline, d_ogrid[i], d_accel);
+
+    in  += d_inum;
+    out += d_onum;
+  }
+
+  return noutput_items;
+}
diff --git a/gnuradio-core/src/lib/general/gr_squash_ff.h b/gnuradio-core/src/lib/general/gr_squash_ff.h
new file mode 100644
index 000000000..43880857e
--- /dev/null
+++ b/gnuradio-core/src/lib/general/gr_squash_ff.h
@@ -0,0 +1,67 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2004 Free Software Foundation, Inc.
+ * 
+ * This file is part of GNU Radio
+ * 
+ * GNU Radio is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3, or (at your option)
+ * any later version.
+ * 
+ * GNU Radio 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 General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with GNU Radio; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifndef   	INCLUDED_GR_SQUASH_FF_H_
+# define   	INCLUDED_GR_SQUASH_FF_H_
+
+#include <gr_sync_block.h>
+#include <gsl/gsl_errno.h>
+#include <gsl/gsl_interp.h>
+#include <gsl/gsl_spline.h>
+/*!
+ * \brief implements cheap resampling of spectrum directly from
+ * spectral points, using gsl interpolation
+ * \ingroup misc
+ */
+
+class gr_squash_ff;
+typedef boost::shared_ptr<gr_squash_ff> gr_squash_ff_sptr;
+
+gr_squash_ff_sptr gr_make_squash_ff(const std::vector<float> &igrid,
+				    const std::vector<float> &ogrid);
+
+class gr_squash_ff : public gr_sync_block
+{
+  friend gr_squash_ff_sptr gr_make_squash_ff(const std::vector<float> &igrid,
+					     const std::vector<float> &ogrid);
+  
+  size_t  d_inum;
+  size_t  d_onum;
+  double *d_igrid;
+  double *d_iwork;
+  double *d_ogrid;
+
+  gsl_interp_accel *d_accel;
+  gsl_spline       *d_spline;
+  
+  gr_squash_ff(const std::vector<float> &igrid,
+	       const std::vector<float> &ogrid);
+
+ public:
+  ~gr_squash_ff();
+
+  int work(int noutput_items,
+	   gr_vector_const_void_star &input_items,
+	   gr_vector_void_star &output_items);
+};
+
+#endif
diff --git a/gnuradio-core/src/lib/general/gr_squash_ff.i b/gnuradio-core/src/lib/general/gr_squash_ff.i
new file mode 100644
index 000000000..c89b1c28d
--- /dev/null
+++ b/gnuradio-core/src/lib/general/gr_squash_ff.i
@@ -0,0 +1,34 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2008 Free Software Foundation, Inc.
+ * 
+ * This file is part of GNU Radio
+ * 
+ * GNU Radio is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3, or (at your option)
+ * any later version.
+ * 
+ * GNU Radio 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 General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+GR_SWIG_BLOCK_MAGIC(gr,squash_ff);
+
+gr_squash_ff_sptr gr_make_squash_ff(const std::vector<float> &igrid,
+				    const std::vector<float> &ogrid);
+
+class gr_squash_ff : public gr_sync_block
+{
+private:
+  gr_squash_ff(const std::vector<float> &igrid,
+	       const std::vector<float> &ogrid);
+
+};
+
diff --git a/gnuradio-core/src/lib/general/gr_stretch_ff.cc b/gnuradio-core/src/lib/general/gr_stretch_ff.cc
new file mode 100644
index 000000000..0913d5277
--- /dev/null
+++ b/gnuradio-core/src/lib/general/gr_stretch_ff.cc
@@ -0,0 +1,74 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2004 Free Software Foundation, Inc.
+ * 
+ * This file is part of GNU Radio
+ * 
+ * GNU Radio is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3, or (at your option)
+ * any later version.
+ * 
+ * GNU Radio 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 General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with GNU Radio; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <gr_stretch_ff.h>
+#include <gr_io_signature.h>
+
+gr_stretch_ff_sptr
+gr_make_stretch_ff(float lo, size_t vlen)
+{
+  return gr_stretch_ff_sptr(new gr_stretch_ff(lo, vlen));
+}
+
+gr_stretch_ff::gr_stretch_ff(float lo, size_t vlen)
+  : gr_sync_block("stretch_ff",
+		  gr_make_io_signature(1, 1, vlen * sizeof(float)),
+		  gr_make_io_signature(1, 1, vlen * sizeof(float))),
+    d_lo(lo), d_vlen(vlen)
+{
+}
+
+int
+gr_stretch_ff::work(int noutput_items,
+		    gr_vector_const_void_star &input_items,
+		    gr_vector_void_star &output_items)
+{
+  const float *in  = (const float *) input_items[0];
+  float       *out = (float *) output_items[0];
+  
+  for (int count = 0; count < noutput_items; count++) {
+    float vmax = in[0] - d_lo;
+
+    for (int i = 1; i < d_vlen; i++) {
+      float vtmp = in[i] - d_lo;
+      if (vtmp > vmax)
+	vmax = vtmp;
+    }
+    
+    if (vmax != 0.0)
+      for (int i = 0; i < d_vlen; i++)
+	out[i] = d_lo * (1.0 - (in[i] - d_lo) / vmax);
+    else
+      for (int i = 0; i < d_vlen; i++)
+	out[i] = in[i];
+
+    in  += d_vlen;
+    out += d_vlen;
+  }
+  
+  return noutput_items;
+}
+
diff --git a/gnuradio-core/src/lib/general/gr_stretch_ff.h b/gnuradio-core/src/lib/general/gr_stretch_ff.h
new file mode 100644
index 000000000..d2164f8f4
--- /dev/null
+++ b/gnuradio-core/src/lib/general/gr_stretch_ff.h
@@ -0,0 +1,59 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2004 Free Software Foundation, Inc.
+ * 
+ * This file is part of GNU Radio
+ * 
+ * GNU Radio is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3, or (at your option)
+ * any later version.
+ * 
+ * GNU Radio 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 General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with GNU Radio; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifndef   	INCLUDED_GR_STRETCH_FF_H_
+# define   	INCLUDED_GR_STRETCH_FF_H_
+
+#include <gr_sync_block.h>
+
+/*!
+ * \brief adjust y-range of an input vector by mapping to range
+ * (max-of-input, stipulated-min). Primarily for spectral signature
+ * matching by normalizing spectrum dynamic ranges.
+ * \ingroup misc
+ */
+
+
+class gr_stretch_ff;
+typedef boost::shared_ptr<gr_stretch_ff> gr_stretch_ff_sptr;
+
+gr_stretch_ff_sptr gr_make_stretch_ff(float lo, size_t vlen);
+
+class gr_stretch_ff : public gr_sync_block
+{
+  friend gr_stretch_ff_sptr gr_make_stretch_ff(float lo, size_t vlen);
+
+  float	d_lo;		// the constant
+  size_t d_vlen;
+  gr_stretch_ff(float lo, size_t vlen);
+
+ public:
+  float lo() const { return d_lo; }
+  void set_lo(float lo) { d_lo = lo; }
+  size_t vlen() const { return d_vlen; }
+
+  int work(int noutput_items,
+	   gr_vector_const_void_star &input_items,
+	   gr_vector_void_star &output_items);
+};
+
+#endif
diff --git a/gnuradio-core/src/lib/general/gr_stretch_ff.i b/gnuradio-core/src/lib/general/gr_stretch_ff.i
new file mode 100644
index 000000000..74c10fb2f
--- /dev/null
+++ b/gnuradio-core/src/lib/general/gr_stretch_ff.i
@@ -0,0 +1,31 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2008 Free Software Foundation, Inc.
+ * 
+ * This file is part of GNU Radio
+ * 
+ * GNU Radio is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3, or (at your option)
+ * any later version.
+ * 
+ * GNU Radio 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 General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+GR_SWIG_BLOCK_MAGIC(gr,stretch_ff);
+
+gr_stretch_ff_sptr gr_make_stretch_ff(float lo, size_t vlen);
+
+class gr_stretch_ff : public gr_sync_block
+{
+private:
+  gr_stretch_ff(float lo, size_t vlen);
+};
+
diff --git a/gnuradio-core/src/lib/general/gr_wavelet_ff.cc b/gnuradio-core/src/lib/general/gr_wavelet_ff.cc
new file mode 100644
index 000000000..6cbfa2381
--- /dev/null
+++ b/gnuradio-core/src/lib/general/gr_wavelet_ff.cc
@@ -0,0 +1,107 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2008 Free Software Foundation, Inc.
+ * 
+ * This file is part of GNU Radio
+ * 
+ * GNU Radio is free software; you can redistribute it and/or modify
+ * it under the tewavelet of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3, or (at your option)
+ * any later version.
+ * 
+ * GNU Radio 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 General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with GNU Radio; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <stdexcept>
+#include <gr_wavelet_ff.h>
+#include <gr_io_signature.h>
+
+#include <stdio.h>
+
+// NB in this version, only Daubechies wavelets
+// order is wavelet length, even, 2...20
+
+gr_wavelet_ff_sptr
+gr_make_wavelet_ff(int size,
+		   int order,
+		   bool forward)
+{
+  return gr_wavelet_ff_sptr(new gr_wavelet_ff(size,
+					      order,
+					      forward));
+}
+
+gr_wavelet_ff::gr_wavelet_ff(int size,
+			     int order,
+			     bool forward)
+  : gr_sync_block("wavelet_ff",
+		  gr_make_io_signature(1, 1, size * sizeof(float)),
+		  gr_make_io_signature(1, 1, size * sizeof(float))),
+    d_size(size),
+    d_order(order),
+    d_forward(forward)
+{
+  d_wavelet = gsl_wavelet_alloc(gsl_wavelet_daubechies, d_order);
+  if (d_wavelet == NULL)
+    throw std::runtime_error("can't allocate wavelet");
+  d_workspace = gsl_wavelet_workspace_alloc(d_size);
+  if (d_workspace == NULL)
+    throw std::runtime_error("can't allocate wavelet workspace");
+  d_temp = (double *) malloc(d_size*sizeof(double));
+  if (d_workspace == NULL)
+    throw std::runtime_error("can't allocate wavelet double conversion temp");
+}
+
+gr_wavelet_ff::~gr_wavelet_ff()
+{
+  gsl_wavelet_free(d_wavelet);
+  gsl_wavelet_workspace_free(d_workspace);
+  free((char *) d_temp);
+}
+
+int
+gr_wavelet_ff::work(int noutput_items,
+		    gr_vector_const_void_star &input_items,
+		    gr_vector_void_star &output_items)
+{
+  const float *in  = (const float *) input_items[0];
+  float       *out = (float *) output_items[0];
+
+  for (int count = 0; count < noutput_items; count++) {
+    for (int i = 0; i < d_size; i++)
+      d_temp[i] = in[i];
+    
+    if (d_forward)
+      gsl_wavelet_transform_forward(d_wavelet,
+				    d_temp,
+				    1,
+				    d_size,
+				    d_workspace);
+    else
+      gsl_wavelet_transform_inverse(d_wavelet,
+				    d_temp,
+				    1,
+				    d_size,
+				    d_workspace);
+    
+    for (int i = 0; i < d_size; i++)
+      out[i] = d_temp[i];
+
+    in  += d_size;
+    out += d_size;
+  }
+
+  return noutput_items;
+}
diff --git a/gnuradio-core/src/lib/general/gr_wavelet_ff.h b/gnuradio-core/src/lib/general/gr_wavelet_ff.h
new file mode 100644
index 000000000..1e98d2e49
--- /dev/null
+++ b/gnuradio-core/src/lib/general/gr_wavelet_ff.h
@@ -0,0 +1,70 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2005 Free Software Foundation, Inc.
+ * 
+ * This file is part of GNU Radio
+ * 
+ * GNU Radio is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3, or (at your option)
+ * any later version.
+ * 
+ * GNU Radio 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 General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with GNU Radio; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+#ifndef INCLUDED_GR_WAVELET_FF_H
+#define INCLUDED_GR_WAVELET_FF_H
+
+#include <iostream>
+#include <gr_sync_block.h>
+
+#include <gsl/gsl_errno.h>
+#include <gsl/gsl_wavelet.h>
+
+class gr_wavelet_ff;
+typedef boost::shared_ptr<gr_wavelet_ff> gr_wavelet_ff_sptr;
+
+gr_wavelet_ff_sptr
+gr_make_wavelet_ff(int size = 1024,
+		   int order = 20,
+		   bool forward = true);
+
+/*!
+ * \brief compute wavelet transform using gsl routines
+ * \ingroup math
+ */
+
+class gr_wavelet_ff : public gr_sync_block
+{
+  int                    d_size;
+  int                    d_order;
+  bool			 d_forward;
+  gsl_wavelet           *d_wavelet;
+  gsl_wavelet_workspace *d_workspace;
+  double                *d_temp;
+
+  friend gr_wavelet_ff_sptr
+    gr_make_wavelet_ff(int size,
+		       int order,
+		       bool forward);
+
+  gr_wavelet_ff(int size,
+		int order,
+		bool forward);
+
+public:
+  ~gr_wavelet_ff();
+
+  int work (int noutput_items,
+	    gr_vector_const_void_star &input_items,
+	    gr_vector_void_star &output_items);
+};
+
+#endif /* INCLUDED_GR_WAVELET_FF_H */
diff --git a/gnuradio-core/src/lib/general/gr_wavelet_ff.i b/gnuradio-core/src/lib/general/gr_wavelet_ff.i
new file mode 100644
index 000000000..9d4264170
--- /dev/null
+++ b/gnuradio-core/src/lib/general/gr_wavelet_ff.i
@@ -0,0 +1,31 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2008 Free Software Foundation, Inc.
+ * 
+ * This file is part of GNU Radio
+ * 
+ * GNU Radio is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3, or (at your option)
+ * any later version.
+ * 
+ * GNU Radio 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 General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+GR_SWIG_BLOCK_MAGIC(gr,wavelet_ff);
+
+gr_wavelet_ff_sptr gr_make_wavelet_ff(int size, int order, bool forward);
+
+class gr_wavelet_ff : public gr_sync_block
+{
+private:
+  gr_wavelet_ff(int size, int order, bool forward);
+};
+
diff --git a/gnuradio-core/src/lib/general/gr_wvps_ff.cc b/gnuradio-core/src/lib/general/gr_wvps_ff.cc
new file mode 100644
index 000000000..f814ba8fc
--- /dev/null
+++ b/gnuradio-core/src/lib/general/gr_wvps_ff.cc
@@ -0,0 +1,98 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2004 Free Software Foundation, Inc.
+ * 
+ * This file is part of GNU Radio
+ * 
+ * GNU Radio is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3, or (at your option)
+ * any later version.
+ * 
+ * GNU Radio 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 General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with GNU Radio; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <gr_wvps_ff.h>
+#include <gr_io_signature.h>
+#include <string.h>
+
+static int
+ceil_log2(int k)
+{
+  int m = 0;
+  for (int n = k-1; n > 0; n >>= 1) m++;
+  return m;
+}
+
+gr_wvps_ff_sptr
+gr_make_wvps_ff(int ilen)
+{
+  return gr_wvps_ff_sptr(new gr_wvps_ff(ilen));
+}
+
+gr_wvps_ff::gr_wvps_ff(int ilen)
+  : gr_sync_block("wvps_ff",
+		  gr_make_io_signature(1, 1, sizeof(float) * ilen),
+		  gr_make_io_signature(1, 1, sizeof(float) * ceil_log2(ilen))),
+    d_ilen(ilen), d_olen(ceil_log2(ilen))
+{
+}
+
+// input vector assumed to be output from gsl wavelet computation
+
+int
+gr_wvps_ff::work(int noutput_items,
+		 gr_vector_const_void_star &input_items,
+		 gr_vector_void_star &output_items)
+{
+  const float *in  = (const float *) input_items[0];
+  float       *out = (float *) output_items[0];
+
+  for (int count = 0; count < noutput_items; count++) {
+
+    // any power?
+
+    if (in[0] == 0.0) {
+      for (int i = 0; i < d_olen; i++)
+	out[i] = 0.0;
+
+    } else {
+      
+      // get power normalization from 0-th wavelet coefficient
+
+      float scl = 1.0/(in[0]*in[0]);
+      int k = 1;
+      
+      // sum powers over sequences of bins,
+      // sequence lengths in increasing powers of 2
+      
+      for (int e = 0; e < d_olen; e++) {
+	int m = 01<<e;
+	float sum = 0.0;
+	
+	for (int l = 0; l < m; l++)
+	  sum += (in[k+l]*in[k+l]);
+	
+	out[e] = scl*sum;
+	k += m;
+      }
+    }
+
+    in  += d_ilen;
+    out += d_olen;
+  }
+
+  return noutput_items;
+}
diff --git a/gnuradio-core/src/lib/general/gr_wvps_ff.h b/gnuradio-core/src/lib/general/gr_wvps_ff.h
new file mode 100644
index 000000000..ced9646bb
--- /dev/null
+++ b/gnuradio-core/src/lib/general/gr_wvps_ff.h
@@ -0,0 +1,57 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2008 Free Software Foundation, Inc.
+ * 
+ * This file is part of GNU Radio
+ * 
+ * GNU Radio is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3, or (at your option)
+ * any later version.
+ * 
+ * GNU Radio 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 General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with GNU Radio; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifndef INCLUDED_GR_WVPS_FF_H
+#define INCLUDED_GR_WVPS_FF_H
+
+#include <gr_sync_decimator.h>
+
+class gr_wvps_ff;
+typedef boost::shared_ptr<gr_wvps_ff> gr_wvps_ff_sptr;
+
+gr_wvps_ff_sptr 
+gr_make_wvps_ff(int ilen);
+
+
+/*!
+ * \brief computes the Wavelet Power Spectrum from a set of wavelet coefficients
+ * \ingroup misc
+ */
+class gr_wvps_ff : public gr_sync_block
+{
+  friend gr_wvps_ff_sptr
+  gr_make_wvps_ff(int ilen);
+
+  int d_ilen;
+  int d_olen;
+
+ protected:
+  gr_wvps_ff(int ilen);
+
+ public:
+  int work(int noutput_items,
+	   gr_vector_const_void_star &input_items,
+	   gr_vector_void_star &output_items);
+
+};
+
+#endif /* INCLUDED_GR_WVPS_FF_H */
diff --git a/gnuradio-core/src/lib/general/gr_wvps_ff.i b/gnuradio-core/src/lib/general/gr_wvps_ff.i
new file mode 100644
index 000000000..877126fb2
--- /dev/null
+++ b/gnuradio-core/src/lib/general/gr_wvps_ff.i
@@ -0,0 +1,29 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2008 Free Software Foundation, Inc.
+ * 
+ * This file is part of GNU Radio
+ * 
+ * GNU Radio is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3, or (at your option)
+ * any later version.
+ * 
+ * GNU Radio 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 General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+GR_SWIG_BLOCK_MAGIC(gr,wvps_ff);
+
+gr_wvps_ff_sptr gr_make_wvps_ff(int ilen);
+
+class gr_wvps_ff : public gr_sync_block
+{
+private:
+  gr_wvps_ff(int ilen);
+};