calculateIBIStdDev()

float fl::audio::detector::MusicalBeat::calculateIBIStdDev ( ) const

private

Calculate standard deviation of IBI history.

Returns

Standard deviation in seconds (lower = more consistent tempo)

Definition at line 219 of file musical_beat_detector.cpp.hpp.

                                            {
    if (mIBIHistory.size() < 2) {
        return 0.0f;
    }
 
    // Calculate mean IBI in frames
    u32 sum = 0;
    for (size i = 0; i < mIBIHistory.size(); ++i) {
        sum += mIBIHistory[i];
    }
    float mean = static_cast<float>(sum) / static_cast<float>(mIBIHistory.size());
 
    // Calculate variance
    float variance = 0.0f;
    for (size i = 0; i < mIBIHistory.size(); ++i) {
        float diff = static_cast<float>(mIBIHistory[i]) - mean;
        variance += diff * diff;
    }
    variance /= static_cast<float>(mIBIHistory.size());
 
    // Convert std dev from frames to seconds
    float stdDevFrames = fl::sqrt(variance);
    return (stdDevFrames * static_cast<float>(mConfig.samplesPerFrame)) /
           static_cast<float>(mConfig.sampleRate);
}

References mConfig, mIBIHistory, and fl::sqrt().

Referenced by calculateBeatConfidence().

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