Preemphasize

Computes preemphasis of a single precision real signal in-place.

Syntax

IppStatus ippsPreemphasize_16s(Ipp16s* pSrcDst, int len, Ipp32f val);

IppStatus ippsPreemphasize_32f(Ipp32f* pSrcDst, int len, Ipp32f val);

Parameters

pSrcDst	Pointer to the source and destination vector for the in-place operation.
len	Number of elements in the vector.
val	Multiplier factor used in the difference signal preemphasis equation.

Description

The in-place function ippsPreemphasize is declared in the ipps.h file. This function computes preemphasis of a real signal pSrcDst. The computation is performed according to the difference signal preemphasis equation:

y(n) = x(n) - val * x(n - 1),

where y(n) is the preemphasized output, x(n) is the input, and val is the multiplier factor.

Note that usually val = 0.95 for speech signals.

Return Values

ippStsNoErr	Indicates no error.
ippStsNullPtrErr	Indicates an error when the pSrcDst pointer is NULL.
ippStsSizeErr	Indicates an error when len is less than or equal to 0.