AdaptiveCodebookGain

Calculates the gain of the adaptive-codebook vector and the filtered codebook vector.

Syntax

IppStatus ippsAdaptiveCodebookGain_G729_16s(const Ipp16s* pSrcAdptTarget, const Ipp16s* pSrcImpulseResponse, const Ipp16s* pSrcAdptVector, Ipp16s* pDstFltAdptVector, Ipp16s* pResultAdptGain);

IppStatus ippsAdaptiveCodebookGain_G729A_16s(const Ipp16s* pSrcAdptTarget, const Ipp16s* pSrcLPC, const Ipp16s* pSrcAdptVector, Ipp16s* pDstFltAdptVector, Ipp16s* pResultAdptGain);

Parameters

pSrcAdptTarget	Pointer to the adaptive target signal vector [40].
pSrcImpulseResponse	Pointer to the impulse response of the perceptual weighting filter vector [40], in Q12.
pSrcAdptVector	Pointer to the adaptive-codebook vector [40], in Q12 (for ippsAdaptiveCodebookGain_G729_16s) or in Q10 (for ippsAdaptiveCodebookGain_G729A_16s).
pSrcLPC	Pointer to the LPC coefficients of the synthesis filter vector [11], in Q12.
pDstFltAdptVector	Pointer to the filtered adaptive-codebook vector [40].
pResultAdptGain	Pointer to the adaptive-codebook gain, in Q14.

Description

These functions are declared in the ippsc.h file. They compute the gain of the adaptive-codebook vector, and calculate the filtered adaptive-codebook vector, respectively. Both functions are applied in subframes.

The function ippsAdaptiveCodebookGain_G729 is designed for G.729/B codec [ITU729B].

The function ippsAdaptiveCodebookGain_G729A is designed for G.729A codec [ITU729A].

Return Values

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