Discrete Fourier transform. More...

#include <DFT.h>

Inheritance diagram for DFT:

Public Member Functions
	DFT (uint32_t winSize=1024, uint32_t padSize=0, SpectralType specType=COMPLEX, uint32_t numAux=0)
	Constructor.
DFT &	spectrumType (SpectralType v)
	Set format of spectrum data.
DFT &	precise (bool whether)
	Set whether to use precise (but slower) for converting to polar.
void	resize (uint32_t windowSize, uint32_t padSize)
	Set size parameters of transform.
float	freqRes () const
	Get frequency resolution of analysis.
float	overlap () const
	Get transform overlap factor.
bool	overlapping () const
	Whether the transform is overlapping.
uint32_t	sizeHop () const
	Get size of hop.
uint32_t	sizePad () const
	Get size of zero-padding.
uint32_t	sizeWin () const
	Get size of window.
Sync &	syncHop ()
	Hop rate synchronizer.
bool	operator() (float input)
	Reads next sample in for a forward transform.
float	operator() ()
	Returns next sample from inverse transform.
void	forward (const float *src)
	Performs forward transform on a window of samples.
virtual void	inverse (float *dst)
	Performs inverse transform on internal spectrum.
bool	inverseOnNext ()
	Returns true if next call to inverse() will perform the inverse transform.
void	zero ()
	Zeroes internal frequency bins.
void	zeroEnds ()
	Zeroes DC and Nyquist bins.
virtual void	onResync (double r)
	Called by my Sync reference after it changes its value.
float *	aux (uint32_t num)
	Get pointer to an auxiliary buffer.
Complex< float > *	bins () const
	Get pointer to bin data.
Complex< float > &	bin (uint32_t k)
	Get reference to bin value.
const Complex< float > &	bin (uint32_t k) const
	Get read-only reference to bin value.
double	binFreq () const
	Get width of frequency bins.
uint32_t	numBins () const
	Get number of frequency bins.
uint32_t	sizeDFT () const
	Get size of forward transform.
Sync &	syncFreq ()
	Get frequency domain synchronizer.
void	numAux (uint32_t num)
	Sets number of auxilliary buffers, each of size numBins()
double	scaleSPU () const
	Returns ratio of my SPU to my Sync's SPU.
void	scaleSPU (double v)
	Scales samples/unit by factor.
double	spu () const
	Returns local samples/unit.
void	spu (double v)
	Set local samples/unit.
double	ups () const
	Returns local units/sample.
void	ups (double v)
	Set local units/sample.
const Sync *	sync () const
	Returns reference to my Sync.
void	sync (Sync &src)
	Set absolute Sync source.
void	scaleUPS (double v)
	Scales units/sample by factor.
void	nodeInsertL (Synced &node)
	Insert myself to left of node.
void	nodeInsertR (Synced &node)
	Insert myself to right of node.
void	nodeRemove ()
	Remove myself from linked list.
Public Attributes
Synced *	nodeL
	Pointer to left node.
Synced *	nodeR
	Pointer to right node.
Protected Member Functions
void	initSynced ()
	To be called from the constructor(s) of derived classes.

Detailed Description

Discrete Fourier transform.

Constructor & Destructor Documentation

DFT	(	uint32_t	winSize = `1024`,
		uint32_t	padSize = `0`,
		SpectralType	specType = `COMPLEX`,
		uint32_t	numAux = `0`
	)

Constructor.

Parameters:

[in]	winSize	Number of samples in window
[in]	padSize	Number of zeros to append to window
[in]	specType	Format of spectrum data
[in]	numAux	Number of auxilliary buffers of size numBins() to create

Member Function Documentation

void forward ( const float * src )

Performs forward transform on a window of samples.

'src' must have at least sizeWin() number of elements.

Reimplemented in STFT.

void inverse ( float * dst ) [virtual]

Performs inverse transform on internal spectrum.

The resynthesized samples are copied into 'dst'. The destination array must have room for at least sizeDFT() number of elements. If 'dst' equals 0, then the resynthesized samples are not copied, but instead held in the internal transform buffer.

Reimplemented in STFT.

bool inverseOnNext ( )

Returns true if next call to inverse() will perform the inverse transform.

This method is used for doing inverse-only transforms. Basically, it tells you when you should set the frequency samples.

void onResync ( double ratioSPU ) [virtual]

Called by my Sync reference after it changes its value.

Any instance state that depends on the sampling length should be updated here.

Reimplemented from DFTBase< float >.

bool operator() ( float input )

Reads next sample in for a forward transform.

Returns true when sizeDFT() samples are read in and, subsequently, the forward DFT is performed. Returns false otherwise.

Reimplemented in STFT.

float operator() ( )

Returns next sample from inverse transform.

The inverse transform is performed every sizeWin() samples.

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

/Users/ljp/code/gamma/trunk/Gamma/DFT.h
/Users/ljp/code/gamma/trunk/src/DFT.cpp

Public Member Functions

Public Attributes

Protected Member Functions

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation