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// Initialise
private int pos = 0;
private double *register = new double[registerSize];
private double average = 0;
// Variables that could be changed
private int registerSize = 43;
private double C = 150.0, V = 250.0;

// write all zeros to register

//Example in 
//AudioBar::checkWidgetFunctionality()
// m_value is the new value coming from the audiocapture class
// average contains the average energy of the window
// register[pos] is the oldest  value in the window
average += (m_value - register[pos]) / registerSize;
register[pos] = m_value;
pos = (pos+1)%registerSize;
bool beat = m_value > C * average;


// additional extra check is to use the variance.
double variance = 0;
for(int i = 0; i < registerSize;i++){
	variance +=  (register[i] - average)*(register[i] - average);
}

//then your beat check would be
bool beat = (m_value > C * average) && (variance > V) ;

Code: Select all

// Initialise
private int pos = 0;
private double *register = new double[registerSize];
private double average = 0.0;
private double sum = 0.0;
// Variables that could be changed
private int registerSize = 43;
private double C = 150.0, V = 250.0;

// write all zeros to register

//Example in 
//AudioBar::checkWidgetFunctionality()
// m_value is the new value coming from the audiocapture class
// average contains the average energy of the window
// sum containt the average of the energy²
// register[pos] is the oldest  value in the window

average += (m_value - register[pos]) / registerSize;
sum += (m_value * m_value - register[pos] * register[pos]) / registerSize

// updating register
register[pos] = m_value;
pos = (pos+1)%registerSize;

bool beat = (m_value > C * average) && (sum - average* average > V) ;

Code: Select all

// audiocapture.cpp
int bufferSize = AUDIO_DEFAULT_BUFFER_SIZE;