bool SpecificLoudnessANSIS342007::initializeInternal(const SignalBank &input)
{
LOUDNESS_ASSERT(input.getNChannels() > 1,
name_ << ": Insufficient number of input channels.");
//c value from ANSI 2007
parameterC_ = 0.046871;
if (updateParameterCForBinauralInhibition_)
{
parameterC_ /= 0.75;
LOUDNESS_DEBUG(name_
<< ": Scaling parameter C for binaural inhibition model: "
<< parameterC_);
}
//Number of filters below 500Hz
nFiltersLT500_ = 0;
Real eThrqdB500Hz = internalExcitation(500);
//fill loudness parameter vectors
for (int i = 0; i < input.getNChannels(); i++)
{
Real fc = input.getCentreFreq(i);
if (fc < 500)
{
Real eThrqdB = internalExcitation(fc);
eThrqParam_.push_back(pow(10, eThrqdB/10.0));
Real gdB = eThrqdB500Hz - eThrqdB;
parameterG_.push_back(pow(10, gdB/10.0));
parameterA_.push_back(gdBToA(gdB));
parameterAlpha_.push_back(gdBToAlpha(gdB));
nFiltersLT500_++;
}
}
LOUDNESS_DEBUG(name_ << ": number of filters <500 Hz: " << nFiltersLT500_);
//output SignalBank
output_.initialize(input);
return 1;
}
bool SpecificPartialLoudnessMGB1997::initializeInternal(const SignalBank &input)
{
//c value from ANSI 2007
parameterC_ = 0.046871;
if (useANSISpecificLoudness_)
{
yearExp_ = 0.2;
parameterC2_ = parameterC_ / std::pow(1.0707, 0.5);
}
else
{
yearExp_ = 0.5;
parameterC2_ = parameterC_ / std::pow(1040000.0, 0.5);
}
if (updateParameterCForBinauralInhibition_)
{
parameterC_ /= 0.75;
LOUDNESS_DEBUG(name_
<< ": Scaling parameter C for binaural inhibition model: "
<< parameterC_);
}
Real eThrqdB500Hz = internalExcitation(500);
//fill loudness parameter vectors
for (int i = 0; i < input.getNChannels(); i++)
{
Real fc = input.getCentreFreq (i);
Real eThrqdB = internalExcitation (fc);
Real gdB = eThrqdB500Hz - eThrqdB;
eThrqParam_.push_back (std::pow (10, eThrqdB / 10.0));
gParam_.push_back (std::pow (10, gdB / 10.0));
aParam_.push_back (gdBToA (gdB));
alphaParam_.push_back (gdBToAlpha (gdB));
kParam_.push_back (std::pow (10, kdB (fc) / 10.0));
}
//output SignalBank
output_.initialize (input);
return 1;
}