Preemphasize

Computes pre-emphasis of a post filter.

Syntax

IppStatus ippsPreemphasize_G729A_16s (Ipp16s gamma, const Ipp16s* pSrc, Ipp16s* pDst, int len, Ipp16s* pMem);

IppStatus ippsPreemphasize_G729A_16s_I (Ipp16s gamma, Ipp16s* pSrcDst, int len, Ipp16s* pMem);

IppStatus ippsPreemphasize_32f_I(Ipp32f gamma, Ipp32f* pSrcDst, int len, Ipp32f* pMem);

gamma	The filter coefficient, in Q15 for 16s data.
pSrc	Pointer to the source vector, in Q0.
pDst	Pointer to the destination vector, in Q0.
pSrcDst	Pointer to the source and destination vector, in Q0.
len	Number of elements in the source and destination vectors.
pMem	Pointer to the filter memory [1].

These functions are declared in the ippsc.h file and compute pre-emphasis of a post filter.

The computation is performed according to the difference signal pre-emphasis equation:

H(z) = 1-gamma *z^-1)

The filter memory pMem must be initialized to zero and then be constantly updated while filtering.

The functions ippsPreemphasize_G729A perform no rounding (clipping).

ippStsNoErr	Indicates no error.
ippStsNullPtrErr	Indicates an error when one of the specified pointers is NULL.
ippStsSizeErr	Indicates an error when len is less than or equal to 0.