fft.hch File Reference

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Defines
#define	NUMBER_OF_COLUMNS   8
#define	NUMBER_OF_POINTS   (1<<NUMBER_OF_COLUMNS)
#define	NUMBER_OF_FREQUENCIES   (NUMBER_OF_POINTS>>1)
Functions
void	perform_fft (signed 16 *pcm_audio)
void	perform_ifft (signed 16 *modified_audio, unsigned 6 *ifft_info)
void	equalize_audio (audiodata_t *audiodata)
	This routine equalizes the frequencies derived by the FFT calculation, according to the settings of the equalizer bars.

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Define Documentation

#define NUMBER_OF_COLUMNS   8

Definition at line 1 of file fft.hch. Referenced by calculate_fft().

#define NUMBER_OF_POINTS   (1<<NUMBER_OF_COLUMNS)

Definition at line 2 of file fft.hch. Referenced by calculate_fft(), and equalize_audio().

#define NUMBER_OF_FREQUENCIES   (NUMBER_OF_POINTS>>1)

Definition at line 3 of file fft.hch.

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Function Documentation

void perform_fft (  signed 16 *  pcm_audio  )

Definition at line 259 of file fft.hcc. References calculate_fft().

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void perform_ifft (  signed 16 *  modified_audio, unsigned 6 *  ifft_info )

Definition at line 324 of file fft.hcc. References calculate_fft().

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void equalize_audio (  audiodata_t *  audiodata  )

This routine equalizes the frequencies derived by the FFT calculation, according to the settings of the equalizer bars. Note: Cost: 3844 clock cycles (Maximum) Parameters: *audiodata  pointer to the audiodata struct, containing the eq_info, etc. Returns: void Return values: void  Definition at line 398 of file fft.hcc. References audiodata_t::display_log, eq_settings, audiodata_t::equalizer_levels_ptr, multiply(), and NUMBER_OF_POINTS.

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