Include Files

Domain Dependencies

Flavors declared in

ipps.h

:

Headers:

ippcore.h

,

ippvm.h

Libraries:

ippcore.lib

,

ippvm.lib

Description

These functions

compute the inverse DFT according to the

pDFTSpec

specification parameters: the transform

len

, the normalization

flag

, and the specific code

hint

.

The functions using the complex data type, for example with

32fc

suffixes, process the input complex array

pSrc

and store the result in

pDst

.

The functions using the real data type and processing complex signals represented by separate real

pSrcRe

and imaginary

pSrcIm

parts, for example with

32f

suffixes, store the result separately in

pDstRe

and

pDstIm

, respectively.

The function can be used with the external work buffer

pBuffer

to avoid memory allocation within the functions. Once the work buffer is allocated, it can be used for all following calls to the functions computing DFT. As internal allocation of memory is too expensive operation and depends on operating system and/or runtime libraries used - the use of an external buffer improves performance significantly, especially for the small size transforms.

Required buffer size must be computed by the corresponding function

ippsDFTGet BufSize_C

prior to using DFT computation functions.

If the external buffer is not specified (

pBuffer

is set to

NULL

), then the function itself allocates the memory needed for operation.