LPC_AutoCorrelation.hxx

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/*
 * Copyright (c) 2001-2004 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, MA  02111-1307  USA
 *
 */
#ifndef __LPC_AUTOCORRELATION__
#define __LPC_AUTOCORRELATION__

#include "Processing.hxx"
#include "InPort.hxx"
#include "OutPort.hxx"
#include "ProcessingConfig.hxx"
#include "LPModel.hxx"
#include "Spectrum.hxx"

namespace CLAM
{
        class Audio;
        template < class T > class Array;

        class LPCConfig
                : public ProcessingConfig
        {
        public:
                DYNAMIC_TYPE_USING_INTERFACE( LPCConfig, 1, ProcessingConfig );
                DYN_ATTRIBUTE( 0, public, unsigned, Order );
        protected:
                void DefaultInit();
        };

        class LPC_AutoCorrelation 
                : public Processing
        {
        public:
                LPC_AutoCorrelation();
                virtual ~LPC_AutoCorrelation();

                const char* GetClassName() const;

                const ProcessingConfig& GetConfig() const;

                bool  Do(); 

                bool  Do( const Audio& in, LPModel& out );

                bool  Do( const Audio& in, DataArray& A, DataArray& K, TData& E );

        protected:
                InPort<Audio> mAudioIn;
                OutPort<LPModel> mLPModelOut;
                OutPort<Spectrum> mSpectrumOut;

                LPCConfig            mCurrentConfig;
                
                bool ConcreteConfigure( const ProcessingConfig& cfg );

                void ComputeAutocorrelation( const Array<TData>& signal,
                                             Array<TData>& acCoeffs );

                void SolveSystemByLevinsonDurbin( const Array<TData>& R,
                                                  Array<TData>& A,
                                                  Array<TData>& K,
                                                  TData&        E);

        private:
        };

        // inlines

        inline const char* LPC_AutoCorrelation::GetClassName() const
        {
                return "LPC_AutoCorrelation"; 
        }

        inline const ProcessingConfig& LPC_AutoCorrelation::GetConfig() const
        {
                return mCurrentConfig;
        }

}

#endif // LPC_AutoCorrelation.hxx