3 * Copyright 2005 Free Software Foundation, Inc.
5 * This file is part of GNU Radio
7 * GNU Radio is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 3, or (at your option)
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13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with GNU Radio; see the file COPYING. If not, write to
19 * the Free Software Foundation, Inc., 51 Franklin Street,
20 * Boston, MA 02110-1301, USA.
22 #ifndef INCLUDED_GR_FFT_FILTER_FFF_H
23 #define INCLUDED_GR_FFT_FILTER_FFF_H
25 #include <gr_sync_decimator.h>
27 class gr_fft_filter_fff;
28 typedef boost::shared_ptr<gr_fft_filter_fff> gr_fft_filter_fff_sptr;
29 gr_fft_filter_fff_sptr gr_make_fft_filter_fff (int decimation, const std::vector<float> &taps);
32 class gri_fft_real_fwd;
33 class gri_fft_real_rev;
36 * \brief Fast FFT filter with float input, float output and float taps
39 class gr_fft_filter_fff : public gr_sync_decimator
42 friend gr_fft_filter_fff_sptr gr_make_fft_filter_fff (int decimation, const std::vector<float> &taps);
46 int d_fftsize; // fftsize = ntaps + nsamples - 1
47 gri_fft_real_fwd *d_fwdfft; // forward "plan"
48 gri_fft_real_rev *d_invfft; // inverse "plan"
49 std::vector<float> d_tail; // state carried between blocks for overlap-add
50 std::vector<gr_complex> d_xformed_taps; // Fourier xformed taps
51 std::vector<float> d_new_taps;
55 * Construct a FFT filter with the given taps
57 * \param decimation >= 1
58 * \param taps float filter taps
60 gr_fft_filter_fff (int decimation, const std::vector<float> &taps);
62 void compute_sizes(int ntaps);
63 int tailsize() const { return d_ntaps - 1; }
64 void actual_set_taps (const std::vector<float> &taps);
67 ~gr_fft_filter_fff ();
69 void set_taps (const std::vector<float> &taps);
71 int work (int noutput_items,
72 gr_vector_const_void_star &input_items,
73 gr_vector_void_star &output_items);
76 #endif /* INCLUDED_GR_FFT_FILTER_FFF_H */