diff dsp/onsets/DetectionFunction.cpp @ 0:d7116e3183f8

* Queen Mary C++ DSP library

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dsp/onsets/DetectionFunction.cpp	Wed Apr 05 17:35:59 2006 +0000
@@ -0,0 +1,204 @@
+/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */
+
+/*
+    QM DSP Library
+
+    Centre for Digital Music, Queen Mary, University of London.
+    This file copyright 2005-2006 Christian Landone.
+    All rights reserved.
+*/
+
+#include "DetectionFunction.h"
+
+//////////////////////////////////////////////////////////////////////
+// Construction/Destruction
+//////////////////////////////////////////////////////////////////////
+
+DetectionFunction::DetectionFunction( DFConfig Config ) :
+    m_window(0)
+{
+    magHistory = NULL;
+    phaseHistory = NULL;
+    phaseHistoryOld = NULL;
+    j = ComplexData( 0, 1 );
+
+    initialise( Config );
+}
+
+DetectionFunction::~DetectionFunction()
+{
+    deInitialise();
+}
+
+
+void DetectionFunction::initialise( DFConfig Config )
+{
+    m_dataLength = Config.frameLength;
+    m_halfLength = m_dataLength/2;
+    m_DFType = Config.DFType;
+
+    magHistory = new double[ m_halfLength ];
+    memset(magHistory,0, m_halfLength*sizeof(double));
+		
+    phaseHistory = new double[ m_halfLength ];
+    memset(phaseHistory,0, m_halfLength*sizeof(double));
+
+    phaseHistoryOld = new double[ m_halfLength ];
+    memset(phaseHistoryOld,0, m_halfLength*sizeof(double));
+
+    m_phaseVoc = new PhaseVocoder;
+
+    m_DFWindowedFrame = new double[ m_dataLength ];
+    m_magnitude = new double[ m_halfLength ];
+    m_thetaAngle = new double[ m_halfLength ];
+
+    m_window = new Window<double>(HanningWindow, m_dataLength);
+}
+
+void DetectionFunction::deInitialise()
+{
+    delete [] magHistory ;
+    delete [] phaseHistory ;
+    delete [] phaseHistoryOld ;
+
+    delete m_phaseVoc;
+
+    delete [] m_DFWindowedFrame;
+    delete [] m_magnitude;
+    delete [] m_thetaAngle;
+
+    delete m_window;
+}
+
+double DetectionFunction::process( double *TDomain )
+{
+    double retVal = 0;
+
+    m_window->cut( TDomain, m_DFWindowedFrame );
+	
+    m_phaseVoc->process( m_dataLength, m_DFWindowedFrame, m_magnitude, m_thetaAngle );
+
+    switch( m_DFType )
+    {
+    case DF_HFC:
+	retVal = HFC( m_halfLength, m_magnitude);
+	break;
+	
+    case  DF_SPECDIFF:
+	retVal = specDiff( m_halfLength, m_magnitude);
+	break;
+	
+    case DF_PHASEDEV:
+	retVal = phaseDev( m_halfLength, m_magnitude, m_thetaAngle);
+	break;
+	
+    case DF_COMPLEXSD:
+	retVal = complexSD( m_halfLength, m_magnitude, m_thetaAngle);
+	break;
+    }
+	
+    return retVal;
+}
+
+double DetectionFunction::HFC(unsigned int length, double *src)
+{
+    unsigned int i;
+    double val = 0;
+
+    for( i = 0; i < length; i++)
+    {
+	val += src[ i ] * ( i + 1);
+    }
+    return val;
+}
+
+double DetectionFunction::specDiff(unsigned int length, double *src)
+{
+    unsigned int i;
+    double val = 0.0;
+    double temp = 0.0;
+    double diff = 0.0;
+
+    for( i = 0; i < length; i++)
+    {
+	temp = fabs( (src[ i ] * src[ i ]) - (magHistory[ i ] * magHistory[ i ]) );
+		
+	diff= sqrt(temp);
+
+	if( src[ i ] > 0.1)
+	{
+	    val += diff;
+	}
+
+	magHistory[ i ] = src[ i ];
+    }
+
+    return val;
+}
+
+
+double DetectionFunction::phaseDev(unsigned int length, double *srcMagnitude, double *srcPhase)
+{
+    unsigned int i;
+    double tmpPhase = 0;
+    double tmpVal = 0;
+    double val = 0;
+
+    double dev = 0;
+
+    for( i = 0; i < length; i++)
+    {
+	tmpPhase = (srcPhase[ i ]- 2*phaseHistory[ i ]+phaseHistoryOld[ i ]);
+	dev = MathUtilities::princarg( tmpPhase );
+		
+	if( srcMagnitude[ i  ] > 0.1)
+	{
+	    tmpVal  = fabs( dev);
+	    val += tmpVal ;
+	}
+
+	phaseHistoryOld[ i ] = phaseHistory[ i ] ;
+	phaseHistory[ i ] = srcPhase[ i ];
+    }
+	
+	
+    return val;
+}
+
+
+double DetectionFunction::complexSD(unsigned int length, double *srcMagnitude, double *srcPhase)
+{
+    unsigned int i;
+    double val = 0;
+    double tmpPhase = 0;
+    double tmpReal = 0;
+    double tmpImag = 0;
+   
+    double dev = 0;
+    ComplexData meas = ComplexData( 0, 0 );
+
+    for( i = 0; i < length; i++)
+    {
+	tmpPhase = (srcPhase[ i ]- 2*phaseHistory[ i ]+phaseHistoryOld[ i ]);
+	dev= MathUtilities::princarg( tmpPhase );
+		
+	meas = magHistory[i] - ( srcMagnitude[ i ] * exp( j * dev) );
+
+	tmpReal = real( meas );
+	tmpImag = imag( meas );
+
+	val += sqrt( (tmpReal * tmpReal) + (tmpImag * tmpImag) );
+		
+	phaseHistoryOld[ i ] = phaseHistory[ i ] ;
+	phaseHistory[ i ] = srcPhase[ i ];
+	magHistory[ i ] = srcMagnitude[ i ];
+    }
+
+    return val;
+}
+
+double* DetectionFunction::getSpectrumMagnitude()
+{
+    return m_magnitude;
+}
+