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/*
* Copyright (c) 2008 MUSIC TECHNOLOGY GROUP (MTG)
* UNIVERSITAT POMPEU FABRA
*
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, M 02111-1307 USA
*
*/
/*! \file stocAnalysis.c
* \brief stochastic analysis using spectral analysis and approximation
*/
#include "sms.h"
/*! \brief main function for the stochastic analysis
* \param sizeWindow size of buffer
* \param pResidual pointer to residual signal
* \param pWindow pointer to windowing array
* \param pSmsData pointer to output SMS data
* \param pAnalParams point to analysis parameters
* \return 0 on success, -1 on error
*/
int sms_stocAnalysis(int sizeWindow, sfloat *pResidual, sfloat *pWindow,
SMS_Data *pSmsData, SMS_AnalParams* pAnalParams)
{
int i;
sfloat fMag = 0.0;
sms_spectrumMag(sizeWindow, pResidual, pWindow, pAnalParams->sizeStocMagSpectrum,
pAnalParams->stocMagSpectrum, pAnalParams->fftBuffer);
sms_spectralApprox(pAnalParams->stocMagSpectrum, pAnalParams->sizeStocMagSpectrum,
pAnalParams->sizeStocMagSpectrum, pSmsData->pFStocCoeff,
pSmsData->nCoeff, pSmsData->nCoeff,
pAnalParams->approxEnvelope);
/* get energy of spectrum */
for(i = 0; i < pAnalParams->sizeStocMagSpectrum; i++)
fMag += (pAnalParams->stocMagSpectrum[i] * pAnalParams->stocMagSpectrum[i]);
*pSmsData->pFStocGain = fMag / pAnalParams->sizeStocMagSpectrum;
return 0;
}
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