vital::FourierTransform Class Reference

A Fourier transform implementation using KissFFT for platforms where other accelerations are unavailable. More...

#include <fourier_transform.h>

Public Member Functions
	FourierTransform (size_t bits)
	Constructs a FourierTransform with the given bits using KissFFT.
	~FourierTransform ()
	Default destructor.
void	transformRealForward (float *data)
	Performs an in-place forward real FFT using KissFFT.
void	transformRealInverse (float *data)
	Performs an in-place inverse real FFT using KissFFT.

Detailed Description

A Fourier transform implementation using KissFFT for platforms where other accelerations are unavailable.

KissFFT is a simple, universally compatible FFT library. This implementation manually arranges real-only data into a complex form before performing forward and inverse transforms, and includes logic to manipulate the Nyquist component.

Note

This class is used as a fallback when no other specialized FFT backends are available.

Constructor & Destructor Documentation

FourierTransform()

vital::FourierTransform::FourierTransform ( size_t bits )

inline

Constructs a FourierTransform with the given bits using KissFFT.

Parameters

bits	The exponent defining the FFT size. The FFT size is 2^bits.

~FourierTransform()

vital::FourierTransform::~FourierTransform ( )

inline

Default destructor.

Member Function Documentation

transformRealForward()

void vital::FourierTransform::transformRealForward ( float * data )

inline

Performs an in-place forward real FFT using KissFFT.

The method rearranges the input array to form a complex array and then calls the forward KissFFT transform. After the transform, it sets the Nyquist and DC components to handle the real-only FFT format.

Parameters

data	Pointer to the input/output data buffer.

transformRealInverse()

void vital::FourierTransform::transformRealInverse ( float * data )

inline

Performs an in-place inverse real FFT using KissFFT.

This method reconstructs the complex data from the given frequency-domain buffer, calls the inverse transform, and then extracts the real data. It also normalizes the resulting time-domain samples appropriately.

Parameters

data	Pointer to the input/output data buffer in frequency-domain format.

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

• /Users/davidvogel/repos/VitalHelp/src/common/fourier_transform.h