Added function Sub() in ITASpectrum and changed function names in ITAISO9613.

include/ITAISO9613.h

@@ -67,10 +67,10 @@ namespace ITABase
 		  * \param fHumidity Relative humidity [%]
 		  * \param fStaticPressure Static air pressure [kPa]
 		  */
-		ITA_BASE_API void  AtmosphericAbsorptionLevel( ITABase::CThirdOctaveDecibelMagnitudeSpectrum& oA_atm_dB, double dDistance, double dTemperature, double dHumidity, double dStaticPressure = 101.325);
+		ITA_BASE_API void  AtmosphericAbsorption( ITABase::CThirdOctaveDecibelMagnitudeSpectrum& oA_atm_dB, double dDistance, double dTemperature, double dHumidity, double dStaticPressure = 101.325);
 
 		//! Calculates the atmospheric absorption in linear factors (instead of decibels)
-		ITA_BASE_API void AtmosphericAbsorptionFactor( ITABase::CThirdOctaveFactorMagnitudeSpectrum& oA_atm_factor, double dDistance, double dTemperature, double dHumidity, double dStaticPressure = 101.325);
+		ITA_BASE_API void AtmosphericAbsorption( ITABase::CThirdOctaveFactorMagnitudeSpectrum& oA_atm_factor, double dDistance, double dTemperature, double dHumidity, double dStaticPressure = 101.325);
 
 	}
 }

include/ITASpectrum.h

@@ -78,6 +78,9 @@ public:
 	//! Element-wise addition
 	void Add( const CITASpectrum& oOtherSpetrum );
 	
+	//! Element-wise subtraction
+	void Sub(const CITASpectrum& oOtherSpetrum);
+
 	//! Compare equality of values (ignores center frequencies, but requires matching number of bands)
 	bool CompareEqualValues( const CITASpectrum& oOtherSpectrum, const float fThreshold = 10.0e-10 ) const;
 	

src/ITAISO9613.cpp

@@ -68,13 +68,13 @@ double ISO9613::AtmosphericAbsorptionFactor(double dFrequency, double dDistance,
 {
 	double dAirAbsorptionDecibel = AtmosphericAbsorptionLevel(dFrequency, dDistance, dTemperature, dHumidity, dStaticPressure);
 	
-	//Factor of absorped signal energy [0:1]
+	//Factor of absorbed signal energy [0:1]
 	double dAirAbsorptionFactor = 1 - pow(10, -dAirAbsorptionDecibel / 10.0);
 
 	return dAirAbsorptionFactor;
 }
 
-void ISO9613::AtmosphericAbsorptionLevel(ITABase::CThirdOctaveDecibelMagnitudeSpectrum& oA_atm_dB, double dDistance, double dTemperature, double dHumidity, double dStaticPressure/*= 101.325*/)
+void ISO9613::AtmosphericAbsorption(ITABase::CThirdOctaveDecibelMagnitudeSpectrum& oA_atm_dB, double dDistance, double dTemperature, double dHumidity, double dStaticPressure/*= 101.325*/)
 {
 	// loop over all frequencies
 	for (int i = 0; i < oA_atm_dB.GetNumBands(); i++)
@@ -85,7 +85,7 @@ void ISO9613::AtmosphericAbsorptionLevel(ITABase::CThirdOctaveDecibelMagnitudeSp
 	}
 }
 
-void ISO9613::AtmosphericAbsorptionFactor(ITABase::CThirdOctaveFactorMagnitudeSpectrum& oA_atm_factor, double dDistance, double dTemperature, double dHumidity, double dStaticPressure/*= 101.325*/)
+void ISO9613::AtmosphericAbsorption(ITABase::CThirdOctaveFactorMagnitudeSpectrum& oA_atm_factor, double dDistance, double dTemperature, double dHumidity, double dStaticPressure/*= 101.325*/)
 {
 	// loop over all frequencies and converting from decibel to a factor between 0 and 1
 	for (int i = 0; i < oA_atm_factor.GetNumBands(); i++)

src/ITASpectrum.cpp

@@ -96,13 +96,22 @@ void CITASpectrum::Add( const float fSummand )
 		m_vfValues[ n ] += fSummand;
 }
 
-void CITASpectrum::Add( const CITASpectrum& oOtherSpetrum )
+void CITASpectrum::Add( const CITASpectrum& oOtherSpectrum )
 {
-	if( GetNumBands() != oOtherSpetrum.GetNumBands() )
+	if( GetNumBands() != oOtherSpectrum.GetNumBands() )
 		ITA_EXCEPT1( INVALID_PARAMETER, "Number of bands mismatching, can not add spectra" );
 
 	for( size_t n = 0; n < m_vfValues.size(); n++ )
-		m_vfValues[ n ] += oOtherSpetrum[ int( n ) ];
+		m_vfValues[ n ] += oOtherSpectrum[ int( n ) ];
+}
+
+void CITASpectrum::Sub(const CITASpectrum& oOtherSpectrum)
+{
+	if (GetNumBands() != oOtherSpectrum.GetNumBands())
+		ITA_EXCEPT1(INVALID_PARAMETER, "Number of bands mismatching, can not sub spectra");
+
+	for (size_t n = 0; n < m_vfValues.size(); n++)
+		m_vfValues[n] -= oOtherSpectrum[int(n)];
 }
 
 bool CITASpectrum::CompareEqualValues( const CITASpectrum& oOtherSpectrum, const float fThreshold /*= 10.0e-10 */ ) const