GNU Radio 3.4.0 C++ API
gri_goertzel.h
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00001 /* -*- c++ -*- */
00002 /*
00003  * Copyright 2006,2011 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_GRI_GOERTZEL_H
00024 #define INCLUDED_GRI_GOERTZEL_H
00025 
00026 #include <gr_types.h>
00027 
00028 /*!
00029  * \brief Implements Goertzel single-bin DFT calculation
00030  * \ingroup misc
00031  */
00032 class gri_goertzel
00033 {
00034 public:
00035   gri_goertzel() {}
00036   gri_goertzel(int rate, int len, float freq);
00037   void gri_setparms(int rate, int len, float freq);
00038 
00039   // Process a input array
00040   gr_complex batch(float *in);
00041 
00042   // Process sample by sample
00043   void input(const float &in);
00044   gr_complex output();
00045   bool ready() const { return d_processed == d_len; }
00046     
00047 private:
00048   float d_d1;
00049   float d_d2;
00050   float d_wr;
00051   float d_wi;
00052   int   d_len;
00053   int   d_processed;
00054 };
00055 
00056 #endif /* INCLUDED_GRI_GOERTZEL_H */