GNU Radio 3.6.5 C++ API

goertzel.h

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00001 /* -*- c++ -*- */
00002 /*
00003  * Copyright 2006,2011,2012 Free Software Foundation, Inc.
00004  *
00005  * This file is part of GNU Radio
00006  *
00007  * GNU Radio is free software; you can redistribute it and/or modify
00008  * it under the terms of the GNU General Public License as published by
00009  * the Free Software Foundation; either version 3, or (at your option)
00010  * any later version.
00011  *
00012  * GNU Radio is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00015  * GNU General Public License for more details.
00016  *
00017  * You should have received a copy of the GNU General Public License
00018  * along with GNU Radio; see the file COPYING.  If not, write to
00019  * the Free Software Foundation, Inc., 51 Franklin Street,
00020  * Boston, MA 02110-1301, USA.
00021  */
00022 
00023 #ifndef INCLUDED_FFT_IMPL_GOERTZEL_H
00024 #define INCLUDED_FFT_IMPL_GOERTZEL_H
00025 
00026 #include <fft/api.h>
00027 #include <gr_types.h>
00028 
00029 namespace gr {
00030   namespace fft {
00031 
00032     /*!
00033      * \brief Implements Goertzel single-bin DFT calculation
00034      * \ingroup misc
00035      */
00036     class FFT_API goertzel
00037     {
00038     public:
00039       goertzel(){}
00040       goertzel(int rate, int len, float freq);
00041       
00042       void set_params(int rate, int len, float freq);
00043       
00044       // Process a input array
00045       gr_complex batch(float *in);
00046       
00047       // Process sample by sample
00048       void input(const float &in);
00049       gr_complex output();
00050       bool ready() const { return d_processed == d_len; }
00051       
00052     private:
00053       float d_d1;
00054       float d_d2;
00055       float d_wr;
00056       float d_wi;
00057       int   d_len;
00058       int   d_processed;
00059     };
00060     
00061   } /* namespace fft */
00062 } /* namespace gr */
00063 
00064 #endif /* INCLUDED_FFT_IMPL_GOERTZEL_H */