OpenLoopPitchSearch

Extracts an open-loop pitch lag estimate from the weighted input speech.

Syntax

IppStatus ippsOpenLoopPitchSearch_AMRWB_16s(const Ipp16s* pSrcWgtSpch, const Ipp16s* pSrcFltWgtSpch, Ipp16s* pPrevMidPitchLag, Ipp16s* pAdaptiveParam, Ipp16s* pDstOpenLoopLag, Ipp16s* pToneFlag, Ipp16s* pDstOpenLoopGain, Ipp16s* pSrcDstPrevPitchLag, Ipp16s* pSrcDstLagSwitcher, int len);

Parameters

pSrcWgtSpch	Pointer to a 320-element vector containing perceptually weighted speech.
pSrcFltWgtSpch	Pointer to a 320-element vector containing perceptually weighted speech, filtered through a high-pass filter perceptually.
pPrevMidPitchLag	Pointer to the median filtered pitch lag of the 5 previous voiced speech half-frames.
pAdaptiveParam	Pointer to the adaptive parameter.
pDstOpenLoopLag	Pointer to a two-element vector of open-loop pitch lags.
pToneFlag	Pointer to the tone flag for the VAD module.
pDstOpenLoopGain	Pointer to a 2-element vector containing optimal open-loop pitch gains.
pSrcDstPrevPitchLag	Pointer to the five-element vector that contains the pitch lags associated with the five most recent voiced speech half-frames.
pSrcDstLagSwitcher	Toggles the lag weighting feature.
len	Length of the frame.

Description

This function is declared in ippsc.h file. The OLP search function ippsOpenLoopPitchSearch_AMRWB extracts a pitch estimate from a weighted version of the input speech.

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.