AdaptiveCodebookSearch

Searches for the integer delay and the fraction delay, and computes the adaptive vector.

Syntax

IppStatus ippsAdaptiveCodebookSearch_G729_16s(Ipp16s valOpenDelay, const Ipp16s* pSrcAdptTarget, const Ipp16s* pSrcImpulseResponse, Ipp16s* pSrcDstPrevExcitation, Ipp16s* pDstDelay, Ipp16s* pDstAdptVector, Ipp16s subFrame);

IppStatus ippsAdaptiveCodebookSearch_G729A_16s(Ipp16s valOpenDelay, const Ipp16s* pSrcAdptTarget, const Ipp16s* pSrcImpulseResponse, Ipp16s* pSrcDstPrevExcitation, Ipp16s* pDstDelay, Ipp16s* pDstAdptVector, Ipp16s subFrame);

IppStatus ippsAdaptiveCodebookSearch_G729D_16s (Ipp16s valOpenDelay, const Ipp16s* pSrcAdptTarget, const Ipp16s* pSrcImpulseResponse, Ipp16s* pSrcDstPrevExcitation, Ipp16s* pDstDelay, Ipp16s subFrame);

Parameters

valOpenDelay	Open-loop delay, in the range [18,145].
pSrcAdptTarget	Pointer to the target signal for adaptive-codebook search vector [40].
pSrcImpulseResponse	Pointer to the impulse response of weighted synthesis filter vector [40], in Q12.
pSrcDstPrevExcitation	Pointer to the previous and updated excitation vector [194].
pDstDelay	Pointer to the integer delay and fraction delay vector [2].
pDstAdptVector	Pointer to the adaptive vector [40].
subFrame	Subframe number, 0 or 1.

Description

These functions are declared in the ippsc.h file. They search for the integer delay T and the fraction delay t, using the target signal and the past filtered excitation, and compute the adaptive vector. They are applied in subframes.

The function ippsAdaptiveCodebookSearch_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.
ippStsRangeErr	Indicates an error when valOpenDelay is not in the range [18, 145], or subFrame is not 0 or 1.