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weightingfilter.cpp
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#include "weightingfilter.h"
#include "math.h"
WeightingFilterItuR468::WeightingFilterItuR468():WeightingFilter()
{
PAIR pair;
pair.freq = 0;
pair.amp = -38;
m_table.append( pair );
pair.freq = 31.5;
pair.amp = -29.9;
m_table.append( pair );
pair.freq = 63;
pair.amp = -23.9;
m_table.append( pair );
pair.freq = 100;
pair.amp = -19.8;
m_table.append( pair );
pair.freq = 200;
pair.amp = -13.8;
m_table.append( pair );
pair.freq = 400;
pair.amp = -7.8;
m_table.append( pair );
pair.freq = 800;
pair.amp = -1.9;
m_table.append( pair );
pair.freq = 1000;
pair.amp = 0.0;
m_table.append( pair );
pair.freq = 2000;
pair.amp = 5.6;
m_table.append( pair );
pair.freq = 3150;
pair.amp = 9.0;
m_table.append( pair );
pair.freq = 4000;
pair.amp = 10.5;
m_table.append( pair );
pair.freq = 5000;
pair.amp = -11.7;
m_table.append( pair );
pair.freq = 6300;
pair.amp = 12.2;
m_table.append( pair );
pair.freq = 7100;
pair.amp = 12;
m_table.append( pair );
pair.freq = 8000;
pair.amp = 11.4;
m_table.append( pair );
pair.freq = 9000;
pair.amp = 10.1;
m_table.append( pair );
pair.freq = 10000;
pair.amp = 8.1;
m_table.append( pair );
pair.freq = 12500;
pair.amp = 0;
m_table.append( pair );
pair.freq = 14000;
pair.amp = -5.3;
m_table.append( pair );
pair.freq = 16000;
pair.amp = -11.7;
m_table.append( pair );
pair.freq = 20000;
pair.amp = -22.2;
m_table.append( pair );
pair.freq = 31500;
pair.amp = -42.7;
m_table.append( pair );
}
double WeightingFilterItuR468::getMagnitudeIndB( const double frequency )
{
double f1(0.0);
double f2(0.0);
double a1(0.0);
double a2(0.0);
for( unsigned int i = 0; i < m_table.size(); i++ )
{
if( m_table.at(i).freq <= frequency )
{
f1 = m_table.at(i).freq;
a1 = m_table.at(i).amp;
}
if( m_table.at(i).freq >= frequency )
{
f2 = m_table.at(i).freq;
a2 = m_table.at(i).amp;
break;
}
}
if( f1 == f2 )
{
return a1;
}
double amp = a1 + (frequency-f1)* ((a2-a1)/(f2-f1));
return amp;
}
double WeightingFilterItuR468::WeightingFilterItuR468::getMagnitude( const double frequency )
{
double m = getMagnitudeIndB( frequency ) / 20;
return pow( 10, m );
}