SpecPowerCalculation Class Reference

SpecPowerCalculation is a simple spectral power level meter. More...

#include <SpecPowerMeter.h>

Collaboration diagram for SpecPowerCalculation:

Public Member Functions
	SpecPowerCalculation (size_t sigLen)
	~SpecPowerCalculation ()
float	CalcPower (float *sig, float fc, float bw)

Private Member Functions
float	CalcBinPower (float *sig_f_r, float *sig_f_i, int loBin, int hiBin)
int	Freq2Bin (float fc)

Private Attributes
const size_t	mSigLen
Floats	mSigI
Floats	mSigFR
Floats	mSigFI

Detailed Description

SpecPowerCalculation is a simple spectral power level meter.

SpecPowerCalculation operates in the Fourier domain and allows power level measurements in subbands or in the entire signal band.

Definition at line 17 of file SpecPowerMeter.h.

Constructor & Destructor Documentation

SpecPowerCalculation()

SpecPowerCalculation::SpecPowerCalculation

(

size_t

sigLen

)

Definition at line 27 of file SpecPowerMeter.cpp.

  : mSigLen(sigLen)
  , mSigI{ sigLen, true }
  , mSigFR{ sigLen }
  , mSigFI{ sigLen }
{
}

~SpecPowerCalculation()

SpecPowerCalculation::~SpecPowerCalculation

(

)

Definition at line 35 of file SpecPowerMeter.cpp.

{
}

Member Function Documentation

CalcBinPower()

float SpecPowerCalculation::CalcBinPower ( float *  sig_f_r, float *  sig_f_i, int  loBin, int  hiBin  )

private

Definition at line 61 of file SpecPowerMeter.cpp.

{
   float pwr = 0.0f;
   
   for (int n = loBin; n < hiBin; n++)
   {
      pwr += ((sig_f_r[n]*sig_f_r[n])+(sig_f_i[n]*sig_f_i[n]));
   }
   
   return pwr;
}

Referenced by CalcPower().

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CalcPower()

float SpecPowerCalculation::CalcPower	(	float *	sig,
		float	fc,
		float	bw
	)

Definition at line 39 of file SpecPowerMeter.cpp.

{
   float pwr;
   int loBin, hiBin;
   
   // Given the bandwidth bw, get the boundary bin numbers
   loBin = Freq2Bin(fc - (bw / 2.0f));
   hiBin = Freq2Bin(fc + (bw / 2.0f));
   if (loBin == hiBin)
   {
      hiBin = loBin + 1;
   }
   
   // Calc the FFT
   FFT(mSigLen, 0, sig, mSigI.get(), mSigFR.get(), mSigFI.get());
   
   // Calc the in-band power
   pwr = CalcBinPower(mSigFR.get(), mSigFI.get(), loBin, hiBin);
   
   return pwr;     
}

References CalcBinPower(), FFT(), Freq2Bin(), mSigFI, mSigFR, mSigI, and mSigLen.

Referenced by FormatClassifier::Run().

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Freq2Bin()

int SpecPowerCalculation::Freq2Bin ( float  fc )

private

Definition at line 73 of file SpecPowerMeter.cpp.

{
   int bin;
   
   // There is no round() in (older) MSVSs ...
   bin = floor((double)fc * mSigLen);
   bin %= (int)mSigLen;
   
   return bin;   
}

References mSigLen.

Referenced by CalcPower().

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Member Data Documentation

mSigFI

Floats SpecPowerCalculation::mSigFI

private

Definition at line 23 of file SpecPowerMeter.h.

Referenced by CalcPower().

mSigFR

Floats SpecPowerCalculation::mSigFR

private

Definition at line 22 of file SpecPowerMeter.h.

Referenced by CalcPower().

mSigI

Floats SpecPowerCalculation::mSigI

private

Definition at line 21 of file SpecPowerMeter.h.

Referenced by CalcPower().

mSigLen

const size_t SpecPowerCalculation::mSigLen

private

Definition at line 19 of file SpecPowerMeter.h.

Referenced by CalcPower(), and Freq2Bin().

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The documentation for this class was generated from the following files:

• SpecPowerMeter.h
• SpecPowerMeter.cpp