PhaseDispersion

Performs the phase dispersion filtering.

Syntax

IppStatus ippsPhaseDispersion_G729D_16s(Ipp16s valCodebookGain, Ipp16s valPitchGain, const Ipp16s* pSrcExcSignal, Ipp16s* pDstFltExcSignal, Ipp16s* pSrcDstInnovation, IppsPhaseDispersion16s_State_G729D* pPhDMem);

Parameters

valPitchGain	Input long term pitch gain.
valCodebookGain	Input codebook gain
pSrcExcSignal	Pointer to the input excitation vector [40].
pDstFltExcSignal	Pointer to the output filtered excitation vector [40].
pSrcDstInnovation	Pointer to the input/output innovative codebook vector [40].
pPhDMem	Pointer to the memory of phase dispersion filter.

Description

The function ippsPhaseDispersion_G729D performs the phase dispersion filtering for the given pitch and codebook gains. The filter alters the innovation signal (mainly its phase), such that a new innovation signal is created with the energy being more spread over the subframe. The filtering is performed by a circular convolution using one of the three "semi-random" impulse responses according to the different amounts of spreading.

Return Values

ippStsNoErr	Indicates no error.
ippStsNullPtrErr	Indicates an error when one of the specified pointers is NULL.