void VoiceAnalyzer::analyzeVoice()
{
m_fftHelper->calculateFFT(m_samples);
int index = m_fftHelper->getMaximumDensityIndex();
if(index == -1)
{
emit lowVoice();
qDebug() << "low voice";
return;
}
qreal stepSizeInFrequency = (qreal)m_format.sampleRate() / (m_totalSampleCount * m_stepSize);
qreal newFrequency = (qreal)(index) * stepSizeInFrequency;
m_currentFrequency = newFrequency;
int correctIndex = qRound(m_frequency / stepSizeInFrequency);
qreal value = 0;
if (m_frequency > newFrequency * TargetFrequencyParameter){
qDebug() << "compare" << "low" << newFrequency << m_frequency - stepSizeInFrequency * correctIndex << (m_frequency - stepSizeInFrequency * correctIndex) / stepSizeInFrequency;
value = -m_maximumVoiceDifference;
} else if (m_frequency * TargetFrequencyParameter < newFrequency){
qDebug() << "compare" << "high" << newFrequency << m_frequency - stepSizeInFrequency * correctIndex << ( m_frequency - stepSizeInFrequency * correctIndex) / stepSizeInFrequency;
value = m_maximumVoiceDifference;
} else {
value = log(newFrequency / (stepSizeInFrequency * correctIndex)) * 12 / M_LN2;
qDebug() << "compare" << value << newFrequency << m_frequency - stepSizeInFrequency * correctIndex << ( m_frequency - stepSizeInFrequency * correctIndex) / stepSizeInFrequency;
}
QVariant valueVar(value);
emit voiceDifference(valueVar);
if(correctIndex == index){
emit(correctFrequency());
}
}
/**
* Analyzes the voice frequency and emits appropriate signals.
*/
void VoiceAnalyzer::analyzeVoice()
{
m_fftHelper->calculateFFT(m_samples);
int index = m_fftHelper->getMaximumDensityIndex();
// If index == -1
if (index == -1) {
// The voice is to be filtered away.
// Emit the lowVoice signal and return.
emit lowVoice();
qDebug() << "low voice";
return;
}
// Else, continue
// Let the correctIndex to be
// the nearest index corresponding to the correct frequency.
qreal stepSizeInFrequency = (qreal)m_format.sampleRate()
/ (m_totalSampleCount * m_stepSize);
qreal newFrequency = qreal(index) * stepSizeInFrequency;
// Calculate the nearest index corresponding to the correct frequency.
int correctIndex = qRound(m_frequency / stepSizeInFrequency);
qreal value = 0;
// If the obtained frequency is more than
// log_2(TargetFrequencyParameter) octaves less than the m_frequency:
// Note:
// Instead of m_frequency/TargetFrequencyParameter > newFrequency,
// the comparison is done without a div instructions by
// m_frequency > newFrequency * TargetFrequencyParameter.
if (m_frequency > newFrequency * TargetFrequencyParameter) {
// Set the difference value to be -m_maximumVoiceDifference.
qDebug() << "compare" << "low" << newFrequency << m_frequency - stepSizeInFrequency * correctIndex << (m_frequency - stepSizeInFrequency * correctIndex) / stepSizeInFrequency;
value = -m_maximumVoiceDifference;
}
// Else, if the obtained frequency is more than
// log_2(TargetFrequencyParameter) octaves more than the m_frequency:
else if (m_frequency*TargetFrequencyParameter < newFrequency) {
// Set the difference value to be m_maximumVoiceDifference.
qDebug() << "compare" << "high" << newFrequency << m_frequency - stepSizeInFrequency * correctIndex << (m_frequency - stepSizeInFrequency * correctIndex) / stepSizeInFrequency;
value = m_maximumVoiceDifference;
}
// Else:
else {
// Calculate the difference between the obtained and the correct
// frequency in tones.
// Use stepSizeInFrequency * correctIndex instead of
// m_frequency so that the value is zero when there is correct
// voice obtained. Set the difference value to be
// log(frequency / target frequency) * 12 / log(2).
value = log(newFrequency / (stepSizeInFrequency * correctIndex))
* 12 / M_LN2;
qDebug() << "compare" << value << newFrequency << m_frequency - stepSizeInFrequency * correctIndex << (m_frequency - stepSizeInFrequency * correctIndex) / stepSizeInFrequency;
}
// Emit voiceDifference signal.
QVariant valueVar(value); //Has to be QVariant for QML
emit voiceDifference(valueVar);
// If the correctIndex is index, emit the correctFrequency signal.
if (correctIndex == index) {
emit(correctFrequency());
}
}
