24 lines
775 B
C
24 lines
775 B
C
/*
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* vim: sw=2 ts=2 expandtab
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*
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* "THE PIZZA-WARE LICENSE" (derived from "THE BEER-WARE LICENCE"):
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* Thomas Kolb <cfr34k@tkolb.de> wrote this file. As long as you retain this
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* notice you can do whatever you want with this stuff. If we meet some day,
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* and you think this stuff is worth it, you can buy me a pizza in return.
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* - Thomas Kolb
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*/
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#ifndef FFT_H
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#define FFT_H
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#include "config.h"
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void init_fft(void);
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void complex_to_absolute(value_type *re, value_type *im, value_type *result);
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void apply_hanning(sample *dftinput);
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void fft_transform(sample *samples, value_type *resultRe, value_type *resultIm);
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uint32_t find_loudest_frequency(value_type *absFFT);
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value_type get_energy_in_band(value_type *fft, uint32_t minFreq, uint32_t maxFreq);
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#endif // FFT_H
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