diff dsp/signalconditioning/DFProcess.cpp @ 225:49844bc8a895

* Queen Mary C++ DSP library

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dsp/signalconditioning/DFProcess.cpp	Wed Apr 05 17:35:59 2006 +0000
@@ -0,0 +1,172 @@
+/* -*- 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 "DFProcess.h"
+#include "dsp/maths/MathUtilities.h"
+
+//////////////////////////////////////////////////////////////////////
+// Construction/Destruction
+//////////////////////////////////////////////////////////////////////
+
+DFProcess::DFProcess( DFProcConfig Config )
+{
+    filtSrc = NULL;
+    filtDst = NULL;	
+    m_filtScratchIn = NULL;
+    m_filtScratchOut = NULL;
+
+    m_FFOrd = 0;
+
+    initialise( Config );
+}
+
+DFProcess::~DFProcess()
+{
+    deInitialise();
+}
+
+void DFProcess::initialise( DFProcConfig Config )
+{
+    m_length = Config.length;
+    m_winPre = Config.winPre;
+    m_winPost = Config.winPost;
+    m_alphaNormParam = Config.AlphaNormParam;
+
+    m_isMedianPositive = Config.isMedianPositive;
+
+    filtSrc = new double[ m_length ];
+    filtDst = new double[ m_length ];
+
+	
+    //Low Pass Smoothing Filter Config
+    m_FilterConfigParams.ord = Config.LPOrd;
+    m_FilterConfigParams.ACoeffs = Config.LPACoeffs;
+    m_FilterConfigParams.BCoeffs = Config.LPBCoeffs;
+	
+    m_FiltFilt = new FiltFilt( m_FilterConfigParams );	
+}
+
+void DFProcess::deInitialise()
+{
+    delete [] filtSrc;
+
+    delete [] filtDst;
+
+    delete [] m_filtScratchIn;
+
+    delete [] m_filtScratchOut;
+
+    delete m_FiltFilt;
+}
+
+void DFProcess::process(double *src, double* dst)
+{
+    removeDCNormalize( src, filtSrc );
+
+    m_FiltFilt->process( filtSrc, filtDst, m_length );
+
+    medianFilter( filtDst, dst );
+}
+
+
+void DFProcess::medianFilter(double *src, double *dst)
+{
+    unsigned int i,k,j,l;
+    unsigned int index = 0;
+
+    double val = 0;
+
+    double* y = new double[ m_winPost + m_winPre + 1];
+    memset( y, 0, sizeof( double ) * ( m_winPost + m_winPre + 1) );
+
+    double* scratch = new double[ m_length ];
+
+    for( i = 0; i < m_winPre; i++)
+    {
+	k = i + m_winPost + 1;
+
+	for( j = 0; j < k; j++)
+	{
+	    y[ j ] = src[ j ];
+	}
+	scratch[ index ] = MathUtilities::median( y, k );
+	index++;
+    }
+
+    for(  i = 0; i < ( m_length - ( m_winPost + m_winPre ) ); i ++)
+    {
+			 
+	l = 0;
+	for(  j  = i; j < ( i + m_winPost + m_winPre + 1); j++)
+	{
+	    y[ l ] = src[ j ];
+	    l++;
+	}
+
+	scratch[ index++ ] = MathUtilities::median( y, (m_winPost + m_winPre + 1 ));
+    }
+
+    for( i = std::max( m_length - m_winPost, (unsigned)1); i < m_length; i++)
+    {
+	k = std::max( i - m_winPre, (unsigned)1);
+
+	l = 0;
+	for( j = k; j < m_length; j++)
+	{
+	    y[ l ] = src[ j ];
+
+	    l++;
+	}
+		
+	scratch[ index++ ] = MathUtilities::median( y, l); 
+    }
+
+
+    for( i = 0; i < m_length; i++ )
+    {
+	val = src[ i ] - scratch[ i ];// - 0.033;
+		
+	if( m_isMedianPositive )
+	{
+	    if( val > 0 )
+	    {
+		dst[ i ]  = val;
+	    }
+	    else
+	    {
+		dst[ i ]  = 0;
+	    }
+	}
+	else
+	{
+	    dst[ i ]  = val;
+	}
+    }
+	
+    delete [] y;
+    delete [] scratch;
+}
+
+
+void DFProcess::removeDCNormalize( double *src, double*dst )
+{
+    double DFmax = 0;
+    double DFMin = 0;
+    double DFAlphaNorm = 0;
+
+    MathUtilities::getFrameMinMax( src, m_length, &DFMin, &DFmax );
+
+    MathUtilities::getAlphaNorm( src, m_length, m_alphaNormParam, &DFAlphaNorm );
+
+    for( unsigned int i = 0; i< m_length; i++)
+    {
+	dst[ i ] = ( src[ i ] - DFMin ) / DFAlphaNorm; 
+    }
+}