detectBeat()

bool detectBeat

(

float

energy

)

Definition at line 117 of file advanced.h.

                              {
    beatHistory[beatHistoryIndex] = energy;
    beatHistoryIndex = (beatHistoryIndex + 1) % 20;
    
    // Calculate average
    beatAverage = 0;
    for (int i = 0; i < 20; i++) {
        beatAverage += beatHistory[i];
    }
    beatAverage /= 20.0f;
    
    // Calculate variance
    beatVariance = 0;
    for (int i = 0; i < 20; i++) {
        float diff = beatHistory[i] - beatAverage;
        beatVariance += diff * diff;
    }
    beatVariance /= 20.0f;
    
    // Detect beat
    float threshold = beatAverage + (beatSensitivity.value() * sqrt(beatVariance));
    uint32_t currentTime = millis();
    
    if (energy > threshold && (currentTime - lastBeatTime) > 80) {
        lastBeatTime = currentTime;
        return true;
    }
    return false;
}

References beatAverage, beatHistory, beatHistoryIndex, beatSensitivity(), beatVariance, and lastBeatTime.

Referenced by loop().

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