GNU Radio 3.6.4.1 C++ API
goertzel.h
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1 /* -*- c++ -*- */
2 /*
3  * Copyright 2006,2011,2012 Free Software Foundation, Inc.
4  *
5  * This file is part of GNU Radio
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7  * GNU Radio is free software; you can redistribute it and/or modify
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22 
23 #ifndef INCLUDED_FFT_IMPL_GOERTZEL_H
24 #define INCLUDED_FFT_IMPL_GOERTZEL_H
25 
26 #include <fft/api.h>
27 #include <gr_types.h>
28 
29 namespace gr {
30  namespace fft {
31 
32  /*!
33  * \brief Implements Goertzel single-bin DFT calculation
34  * \ingroup misc
35  */
37  {
38  public:
40  goertzel(int rate, int len, float freq);
41 
42  void set_params(int rate, int len, float freq);
43 
44  // Process a input array
45  gr_complex batch(float *in);
46 
47  // Process sample by sample
48  void input(const float &in);
49  gr_complex output();
50  bool ready() const { return d_processed == d_len; }
51 
52  private:
53  float d_d1;
54  float d_d2;
55  float d_wr;
56  float d_wi;
57  int d_len;
58  int d_processed;
59  };
60 
61  } /* namespace fft */
62 } /* namespace gr */
63 
64 #endif /* INCLUDED_FFT_IMPL_GOERTZEL_H */