19 lines
598 B
C
19 lines
598 B
C
#ifndef FFT_H
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#define FFT_H
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#include <stdint.h>
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#include "fft_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(value_type *dftinput);
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void fft_transform(value_type *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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// calculate the spectral density in V/sqrt(Hz)
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value_type get_spectral_density_in_band(value_type *fft, uint32_t minFreq, uint32_t maxFreq);
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#endif // FFT_H
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