FFTDriverRealFFT Class Reference

Driver for RealFFT. More...

#include <AudioRealFFT.h>

Inheritance diagram for FFTDriverRealFFT:

Public Member Functions
bool	begin (int len) override
void	end () override
void	fft () override
	Perform FFT.
bool	getBin (int pos, FFTBin &bin) override
	Gets bin real/imag from the result of the last forward fft().
float	getValue (int idx) override
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
	Inverse fft - convert fft result back to time domain (samples)
bool	setBin (int pos, FFTBin &bin)
	sets the value of a bin
bool	setBin (int pos, float real, float img) override
void	setValue (int idx, float value) override
	Sets the real value.

Public Attributes
int	len
ffft::FFTReal< float > *	p_fft_object =nullptr
Vector< float >	v_f {0}
Vector< float >	v_x {0}

Detailed Description

Driver for RealFFT.

Author

Phil Schatzmann

Copyright

GPLv3

Member Function Documentation

begin()

bool begin ( int  len )

inlineoverridevirtual

Implements FFTDriver.

end()

void end ( )

inlineoverridevirtual

Implements FFTDriver.

fft()

void fft ( )

inlineoverridevirtual

Perform FFT.

Implements FFTDriver.

getBin()

bool getBin ( int  pos, FFTBin &  bin  )

inlineoverridevirtual

Gets bin real/imag from the result of the last forward fft().

Reimplemented from FFTDriver.

getValue()

float getValue ( int  idx )

inlineoverridevirtual

Get the reconstructed time-domain sample. Only meaningful after rfft() (inverse FFT) writes its result into v_x; right after a forward fft() this still holds the original input samples, so use getBin() for frequency-domain results instead.

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

Inverse fft - convert fft result back to time domain (samples)

Reimplemented from FFTDriver.

setBin() [1/2]

bool setBin ( int  pos, FFTBin &  bin  )

inlineinherited

sets the value of a bin

setBin() [2/2]

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

inlineoverridevirtual

Sets bin real/imag as input for the next rfft() (inverse FFT). Only bins 0..len/2 are meaningful for a real-valued signal; the negative-imaginary companion for bins 1..len/2-1 is written automatically in the same packed layout do_fft() produces.

Reimplemented from FFTDriver.

setValue()

void setValue ( int  pos, float  value  )

inlineoverridevirtual

Sets the real value.

Implements FFTDriver.

Member Data Documentation

len

int len

p_fft_object

ffft::FFTReal<float>* p_fft_object =nullptr

v_f

Vector<float> v_f {0}

v_x

Vector<float> v_x {0}

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

• src/AudioTools/FFT/AudioRealFFT.h