diff options
| author | Tom Rondeau <trondeau@vt.edu> | 2012-06-16 10:55:36 -0400 |
|---|---|---|
| committer | Tom Rondeau <trondeau@vt.edu> | 2012-06-16 10:55:36 -0400 |
| commit | d647fbbaa07554ad314c9eb2b5c1735b6265d13a (patch) | |
| tree | 0fce319028b37495bef63b7740cd65d7a3378220 /gr-filter/include | |
| parent | 3cd0ea45255e2ca43931b2f067ec82fc92f4293e (diff) | |
filter: adding freq_xlating_filter.
Includes QA and GRC.
Update to build_utils adds a FIR_TYPE for the type of filter and CFIR_TYPE for the type of filter where the taps are always complex (needed for freq_xlating_filter).
Diffstat (limited to 'gr-filter/include')
| -rw-r--r-- | gr-filter/include/filter/CMakeLists.txt | 1 | ||||
| -rw-r--r-- | gr-filter/include/filter/fir_filter.h | 31 | ||||
| -rw-r--r-- | gr-filter/include/filter/freq_xlating_fir_filter_XXX.h.t | 90 |
3 files changed, 122 insertions, 0 deletions
diff --git a/gr-filter/include/filter/CMakeLists.txt b/gr-filter/include/filter/CMakeLists.txt index ca8c7bf072..5da171ffa8 100644 --- a/gr-filter/include/filter/CMakeLists.txt +++ b/gr-filter/include/filter/CMakeLists.txt @@ -65,6 +65,7 @@ endmacro(expand_h) # Invoke macro to generate various sources ####################################################################### expand_h(fir_filter_XXX fff ccf ccc scc fsf) +expand_h(freq_xlating_fir_filter_XXX ccc ccf fcc fcf scc scf) add_custom_target(filter_generated_includes DEPENDS ${generated_includes} diff --git a/gr-filter/include/filter/fir_filter.h b/gr-filter/include/filter/fir_filter.h index ba82c7f481..42b4ac2e03 100644 --- a/gr-filter/include/filter/fir_filter.h +++ b/gr-filter/include/filter/fir_filter.h @@ -93,6 +93,37 @@ namespace gr { /**************************************************************/ + class FILTER_API fir_filter_fcc + { + public: + fir_filter_fcc(int decimation, + const std::vector<gr_complex> &taps); + ~fir_filter_fcc(); + + void set_taps(const std::vector<gr_complex> &taps); + std::vector<gr_complex> taps() const; + unsigned int ntaps() const; + + gr_complex filter(const float input[]); + void filterN(gr_complex output[], + const float input[], + unsigned long n); + void filterNdec(gr_complex output[], + const float input[], + unsigned long n, + unsigned int decimate); + + protected: + std::vector<gr_complex> d_taps; + unsigned int d_ntaps; + gr_complex **d_aligned_taps; + gr_complex *d_output; + int d_align; + int d_naligned; + }; + + /**************************************************************/ + class FILTER_API fir_filter_ccc { public: diff --git a/gr-filter/include/filter/freq_xlating_fir_filter_XXX.h.t b/gr-filter/include/filter/freq_xlating_fir_filter_XXX.h.t new file mode 100644 index 0000000000..d563034610 --- /dev/null +++ b/gr-filter/include/filter/freq_xlating_fir_filter_XXX.h.t @@ -0,0 +1,90 @@ +/* -*- c++ -*- */ +/* + * Copyright 2002,2004,2012 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. + */ + +/* + * WARNING: This file is automatically generated by cmake. + * Any changes made to this file will be overwritten. + */ + +#ifndef @GUARD_NAME@ +#define @GUARD_NAME@ + +#include <filter/api.h> +#include <gr_sync_decimator.h> +#include <gr_rotator.h> + +namespace gr { + namespace filter { + + + /*! + * \brief FIR filter combined with frequency translation with + * @I_TYPE@ input, @O_TYPE@ output and @TAP_TYPE@ taps \ingroup + * filter_blk + * + * This class efficiently combines a frequency translation + * (typically "down conversion") with a FIR filter (typically + * low-pass) and decimation. It is ideally suited for a "channel + * selection filter" and can be efficiently used to select and + * decimate a narrow band signal out of wide bandwidth input. + * + * Uses a single input array to produce a single output array. + * Additional inputs and/or outputs are ignored. + */ + class FILTER_API @BASE_NAME@ : virtual public gr_sync_decimator + { + public: + // gr::filter::@BASE_NAME@::sptr + typedef boost::shared_ptr<@BASE_NAME@> sptr; + + /*! + * \brief FIR filter with @I_TYPE@ input, @O_TYPE@ output, and + * @TAP_TYPE@ taps that also frequency translates a signal from + * \p center_freq. + * \ingroup filter_blk + * + * Construct a FIR filter with the given taps and a composite + * frequency translation that shifts center_freq down to zero + * Hz. The frequency translation logically comes before the + * filtering operation. + * + * \param decimation set the integer decimation rate + * \param taps a vector/list of taps of type @TAP_TYPE@ + * \param center_freq Center frequency of signal to down convert from (Hz) + * \param sampling_freq Sampling rate of signal (in Hz) + */ + static FILTER_API sptr make(int decimation, + const std::vector<@TAP_TYPE@> &taps, + double center_freq, + double sampling_freq); + + virtual void set_center_freq(double center_freq) = 0; + virtual double center_freq() const = 0; + + virtual void set_taps(const std::vector<@TAP_TYPE@> &taps) = 0; + virtual std::vector<@TAP_TYPE@> taps() const = 0; + }; + + } /* namespace filter */ +} /* namespace gr */ + +#endif /* @GUARD_NAME@ */ |