detectBeat()

bool fl::audio::detector::Beat::detectBeat ( u32 timestamp )

private

Definition at line 110 of file beat.cpp.hpp.

                                   {
    // Use adaptive threshold with an absolute floor. The floor handles
    // the silence-to-signal transition when adaptive threshold is near zero,
    // and prevents CQ spectral leakage from triggering false beats.
    static constexpr float MIN_FLUX_THRESHOLD = 50.0f;
    float effectiveThreshold = fl::max(mAdaptiveThreshold, MIN_FLUX_THRESHOLD);
 
    // Check if flux exceeds effective threshold
    if (mSpectralFlux <= effectiveThreshold) {
        return false;
    }
 
    // Check cooldown period
    u32 timeSinceLastBeat = timestamp - mLastBeatTime;
    if (timeSinceLastBeat < MIN_BEAT_INTERVAL_MS) {
        return false;
    }
 
    // Calculate confidence based on how much we exceeded threshold
    if (mAdaptiveThreshold > 0.0f) {
        mConfidence = fl::min(1.0f, (mSpectralFlux - mAdaptiveThreshold) / mAdaptiveThreshold);
    } else {
        mConfidence = 1.0f;
    }
 
    return true;
}

References mAdaptiveThreshold, fl::max(), mConfidence, fl::min(), MIN_BEAT_INTERVAL_MS, mLastBeatTime, and mSpectralFlux.

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