Deemphasize

Performs de-emphasis filtering.

Syntax

IppStatus ippsDeemphasize_AMRWB_NR_16s_I(Ipp16s gamma, Ipp16s* pSrcDst, Ipp16s len, Ipp16s* pMem);

IppStatus ippsDeemphasize_AMRWB_32s16s(Ipp16s gamma, const Ipp32s* pSrc, Ipp16s* pDst, int len, Ipp16s* pMem);

Parameters

gamma	De-emphasis factor.
pSrc	Pointer to the input vector.
pDst	Pointer to the output vector.
pSrcDst	Pointer to the input/output vector.
len	Length of the input/output vector.
pMem	Pointer to the filter memory element.

Description

This function is declared in ippsc.h file. It performs de-emphasis of the input synthesized signal by filtering it with the following transfer function:

H(z) = 1/(1 - γ*z^-1)

The initial memory of the filter must be set to zero. The memory value pMem[0] is updated by pDst[len -1] or pSrcDst[len -1].

Return Values

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 zero.