FFTDriverEspressifFFT Class Reference

fft Driver for espressif dsp library: https://espressif-docs.readthedocs-hosted.com/projects/esp-dsp/en/latest/esp-dsp-apis.html More...

#include <AudioEspressifFFT.h>

Inheritance diagram for FFTDriverEspressifFFT:

Public Member Functions
bool	begin (int len) override
void	conjugate ()
void	end () override
void	fft () override
	Perform FFT.
bool	getBin (int pos, FFTBin &bin) override
	gets the value of a bin
float	getValue (int idx) override
	Get result value from Reverse FFT.
bool	isReverseFFT () override
	Returns true if reverse FFT is supported.
bool	isValid () override
float	magnitude (int idx) override
	Calculate the magnitude (fft result) at index (sqr(i² + r²))
float	magnitudeFast (int idx) override
	magnitude w/o sqrt
void	rfft () override
	Calculate reverse FFT.
bool	setBin (int pos, FFTBin &bin)
bool	setBin (int pos, float real, float img) override
	sets the value of a bin
void	setValue (int idx, float value) override
	Sets the real value.

Public Attributes
Vector< float >	fft_data {0}
int	len =0
esp_err_t	ret
Vector< float >	table_buffer {0}

Detailed Description

fft Driver for espressif dsp library: https://espressif-docs.readthedocs-hosted.com/projects/esp-dsp/en/latest/esp-dsp-apis.html

Author

Phil Schatzmann

Copyright

GPLv3

Member Function Documentation

begin()

bool begin ( int  len )

inlineoverridevirtual

Implements FFTDriver.

conjugate()

void conjugate ( )

inline

end()

void end ( )

inlineoverridevirtual

Implements FFTDriver.

fft()

void fft ( )

inlineoverridevirtual

Perform FFT.

Implements FFTDriver.

getBin()

bool getBin ( int  pos, FFTBin &  bin  )

inlineoverridevirtual

gets the value of a bin

Reimplemented from FFTDriver.

getValue()

float getValue ( int  pos )

inlineoverridevirtual

Get result value from Reverse FFT.

Implements FFTDriver.

isReverseFFT()

bool isReverseFFT ( )

inlineoverridevirtual

Returns true if reverse FFT is supported.

Reimplemented from FFTDriver.

isValid()

bool isValid ( )

inlineoverridevirtual

Implements FFTDriver.

magnitude()

float magnitude ( int  idx )

inlineoverridevirtual

Calculate the magnitude (fft result) at index (sqr(i² + r²))

Implements FFTDriver.

magnitudeFast()

float magnitudeFast ( int  idx )

inlineoverridevirtual

magnitude w/o sqrt

Implements FFTDriver.

rfft()

void rfft ( )

inlineoverridevirtual

Calculate reverse FFT.

Reimplemented from FFTDriver.

setBin() [1/2]

bool setBin ( int  pos, FFTBin &  bin  )

inline

setBin() [2/2]

bool setBin ( int  idx, float  real, float  img  )

inlineoverridevirtual

sets the value of a bin

Reimplemented from FFTDriver.

setValue()

void setValue ( int  pos, float  value  )

inlineoverridevirtual

Sets the real value.

Implements FFTDriver.

Member Data Documentation

fft_data

Vector<float> fft_data {0}

len

int len =0

ret

esp_err_t ret

table_buffer

Vector<float> table_buffer {0}

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The documentation for this class was generated from the following file:

• src/AudioTools/AudioLibs/AudioEspressifFFT.h