Include Files

Domain Dependencies

Flavors declared in

ipps.h

:

Headers:

ippcore.h

,

ippvm.h

Libraries:

ippcore.lib

,

ippvm.lib

Description

These functions

compute the forward DFT according to the

pDFTSpec

specification parameters: the transform

len

, the normalization

flag

, and the specific code

hint

.

The functions operating on the complex data type process the input complex array

pSrc

and store the result in

pDst

.

The functions operating on the real data type (processing complex signals represented by separate real

pSrcRe

and imaginary

pSrcIm

parts) store the result separately in

pDstRe

and

pDstIm

, respectively.

The function can be used with the external work buffer

pBuffer

2) Data vectors for these functions must be aligned to an appropriate number of bytes that is determined by the SIMD width that is supported by the customer's platform - it is reccomended to use ippMalloc function for such purpose as it guarantees such alignment.

Required buffer size must be computed by the corresponding function

ippsDFTGet BufSize_C

prior to using DFT computation functions. If a null pointer is passed, memory will be allocated by the DFT computation functions internally.

The forward DFT functionality can be described as follows:

where

k

is the index of elements in the frequency domain,

n

is the index of elements in the time domain,

N

is the input signal

len

, and

A

is a multiplier defined by

flag

. Also,

x(n)

is

pSrc[n]

and

X(k)

is

pDst[k]

.