3 * Copyright 2008 Free Software Foundation, Inc.
5 * This file is part of GNU Radio
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8 * it under the terms of the GNU General Public License as published by
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19 * the Free Software Foundation, Inc., 51 Franklin Street,
20 * Boston, MA 02110-1301, USA.
23 #ifndef INCLUDED_GR_STRETCH_FF_H_
24 # define INCLUDED_GR_STRETCH_FF_H_
26 #include <gr_sync_block.h>
29 * \brief adjust y-range of an input vector by mapping to range
30 * (max-of-input, stipulated-min). Primarily for spectral signature
31 * matching by normalizing spectrum dynamic ranges.
37 typedef boost::shared_ptr<gr_stretch_ff> gr_stretch_ff_sptr;
39 gr_stretch_ff_sptr gr_make_stretch_ff(float lo, size_t vlen);
41 class gr_stretch_ff : public gr_sync_block
43 friend gr_stretch_ff_sptr gr_make_stretch_ff(float lo, size_t vlen);
45 float d_lo; // the constant
47 gr_stretch_ff(float lo, size_t vlen);
50 float lo() const { return d_lo; }
51 void set_lo(float lo) { d_lo = lo; }
52 size_t vlen() const { return d_vlen; }
54 int work(int noutput_items,
55 gr_vector_const_void_star &input_items,
56 gr_vector_void_star &output_items);