pfb_arb_resampler_ccf.h

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/* -*- c++ -*- */
/*
 * Copyright 2009,2010,2012 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.
 */


#ifndef INCLUDED_PFB_ARB_RESAMPLER_CCF_H
#define INCLUDED_PFB_ARB_RESAMPLER_CCF_H

#include <gnuradio/filter/api.h>
#include <gnuradio/block.h>

namespace gr {
  namespace filter {

    /*!
     * \brief Polyphase filterbank arbitrary resampler with
     *        gr_complex input, gr_complex output and float taps
     * \ingroup resamplers_blk
     *
     * \details

     * This block takes in a signal stream and calls
     * gr::filter::kernel::pfb_arb_resampler_ccf to perform 
     * arbitrary resampling on the stream.
     *
     * Output sampling rate is \p rate * input rate.
     */
    class FILTER_API pfb_arb_resampler_ccf : virtual public block
    {
    public:
      // gr::filter::pfb_arb_resampler_ccf::sptr
      typedef boost::shared_ptr<pfb_arb_resampler_ccf> sptr;

      /*!
       * Build the polyphase filterbank arbitray resampler.
       * \param rate  (float) Specifies the resampling rate to use
       * \param taps  (vector/list of floats) The prototype filter to populate the filterbank. The taps
       *              should be generated at the filter_size sampling rate.
       * \param filter_size (unsigned int) The number of filters in the filter bank. This is directly
       *                    related to quantization noise introduced during the resampling.
       *                    Defaults to 32 filters.
       */
      static sptr make(float rate,
                       const std::vector<float> &taps,
                       unsigned int filter_size=32);

      /*!
       * Resets the filterbank's filter taps with the new prototype filter
       * \param taps    (vector/list of floats) The prototype filter to populate the filterbank.
       */
      virtual void set_taps(const std::vector<float> &taps) = 0;

      /*!
       * Return a vector<vector<>> of the filterbank taps
       */
      virtual std::vector<std::vector<float> > taps() const = 0;

      /*!
       * Print all of the filterbank taps to screen.
       */
      virtual void print_taps() = 0;

      /*!
       * Sets the resampling rate of the block.
       */
      virtual void set_rate (float rate) = 0;

      /*!
       * Sets the current phase offset in radians (0 to 2pi).
       */
      virtual void set_phase(float ph) = 0;

      /*!
       * Gets the current phase of the resampler in radians (2 to 2pi).
       */
      virtual float phase() const = 0;

      /*!
       * Gets the number of taps per filter.
       */
      virtual unsigned int taps_per_filter() const = 0;

      /*!
       * Gets the interpolation rate of the filter.
       */
      virtual unsigned int interpolation_rate() const = 0;

      /*!
       * Gets the decimation rate of the filter.
       */    
      virtual unsigned int decimation_rate() const =0;
      
      /*!
       * Gets the fractional rate of the filter.
       */    
      virtual float fractional_rate() const = 0;

      /*!
       * Get the group delay of the filter.
       */
      virtual int group_delay() const = 0;

      /*!
       * Calculates the phase offset expected by a sine wave of
       * frequency \p freq and sampling rate \p fs (assuming input
       * sine wave has 0 degree phase).
       */
      virtual float phase_offset(float freq, float fs) = 0;
    };

  } /* namespace filter */
} /* namespace gr */

#endif /* INCLUDED_PFB_ARB_RESAMPLER_CCF_H */