dspark::FFTComplex< T > Class Template Reference

Complex FFT on interleaved data (Stockham radix-4 engine, SIMD). More...

#include <FFT.h>

Public Member Functions
	FFTComplex (size_t size)
	Constructs an FFT processor for the given size.
size_t	getSize () const noexcept
	Returns the FFT size (number of complex points).
void	forward (T *data) noexcept
	Performs a forward (time->frequency) FFT in-place.
void	inverse (T *data) noexcept
	Performs an inverse (frequency->time) FFT in-place.

Detailed Description

template<typename T>
class dspark::FFTComplex< T >

Complex FFT on interleaved data (Stockham radix-4 engine, SIMD).

Data layout: interleaved [re0, im0, re1, im1, ...], total 2*N elements. The transform is in place from the caller's view (the engine works in its own buffers).

Template Parameters

T	Sample type (float or double).

Definition at line 336 of file FFT.h.

Constructor & Destructor Documentation

FFTComplex()

template<typename T >

dspark::FFTComplex< T >::FFTComplex ( size_t  size )

inlineexplicit

Constructs an FFT processor for the given size.

Parameters

size	Number of complex samples. Must be a power of two and >= 2.

Exceptions

std::invalid_argument

if size is invalid (with DSPARK_NO_EXCEPTIONS: asserts and degrades to the minimal valid size instead).

Definition at line 345 of file FFT.h.

Member Function Documentation

forward()

template<typename T >

void dspark::FFTComplex< T >::forward ( T *  data )

inlinenoexcept

Performs a forward (time->frequency) FFT in-place.

Parameters

data	Interleaved complex data [re, im, ...], 2*N elements, any alignment.

Definition at line 361 of file FFT.h.

getSize()

template<typename T >

size_t dspark::FFTComplex< T >::getSize ( ) const

inlinenoexcept

Returns the FFT size (number of complex points).

Returns

The size provided at construction.

Definition at line 354 of file FFT.h.

inverse()

template<typename T >

void dspark::FFTComplex< T >::inverse ( T *  data )

inlinenoexcept

Performs an inverse (frequency->time) FFT in-place.

Parameters

data	Interleaved complex data, overwritten with time-domain result.

Note

The output is automatically scaled by 1/N. Unaligned-safe.

Definition at line 368 of file FFT.h.

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

• FFT.h