AdaptiveCodebookSearch

Performs the adaptive codebook search.

Syntax

IppStatus ippsAdaptiveCodebookSearch_AMRWB_16s(const Ipp16s* pSrcAdptTarget, const Ipp16s* pSrcImpulseResponse, const Ipp16s* pSrcOpenLoopLag, Ipp16s* pPitchLag, Ipp16s* pPitchLagBounds, Ipp16s* pSrcDstExcitation, Ipp16s* pFracPitchLag, Ipp16s* pAdptIndex, int subFrame, IppSpchBitRate mode);

Parameters

pSrcAdptTarget	Pointer to the 64-element adaptive target signal vector.
pSrcImpulseResponse	Pointer to the 64-element impulse response of the weighted synthesis filter.
pSrcOpenLoopLag	Pointer to a two-element vector of the OLP lags.
pPitchLag	Pointer to the output previous integral pitch lag.
pPitchLagBounds	Pointer to the bounds of the output previous integral pitch lag.
pSrcDstExcitation	Pointer to the input/output 321-element excitation vector.
pFracPitchLag	Pointer to the output fractional pitch lag obtained during the adaptive codebook search.
pAdptIndex	Pointer to the coded closed-loop pitch index.
subFrame	Subframe number.
mode	Coder mode.

Description

This function is declared in ippsc.h file. The function performs the adaptive codebook search. The adaptive codebook search consists of a closed-loop pitch search followed by computation of an adaptive excitation vector. The adaptive excitation vector is computed by interpolating the past excitation at the fractional pitch lag obtained during the closed-loop pitch search. The adaptive codebook is searched on every subframe.

Return Values

ippStsNoErr	Indicates no error.
ippStsNullPtrErr	Indicates an error when one of the specified pointers is NULL.
ippStsRangeErr	Indicates an error when mode is not a valid element of the enumerated type IppSpchBitRate.
ippStsSizeErr	Indicates an error when subFrame is less than 0 or greater than 3.