GNU Radio 3.5.1 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_core_api.h>
00027 #include <gr_types.h>
00028 
00029 /*!
00030  * \brief Implements Goertzel single-bin DFT calculation
00031  * \ingroup misc
00032  */
00033 class GR_CORE_API gri_goertzel
00034 {
00035 public:
00036   gri_goertzel() {}
00037   gri_goertzel(int rate, int len, float freq);
00038   void gri_setparms(int rate, int len, float freq);
00039 
00040   // Process a input array
00041   gr_complex batch(float *in);
00042 
00043   // Process sample by sample
00044   void input(const float &in);
00045   gr_complex output();
00046   bool ready() const { return d_processed == d_len; }
00047     
00048 private:
00049   float d_d1;
00050   float d_d2;
00051   float d_wr;
00052   float d_wi;
00053   int   d_len;
00054   int   d_processed;
00055 };
00056 
00057 #endif /* INCLUDED_GRI_GOERTZEL_H */