applyCrossBandRejection()

void fl::audio::detector::Percussion::applyCrossBandRejection ( )

private

Definition at line 314 of file percussion.cpp.hpp.

                                         {
    // Winner-takes-all among competing types.
    // With frequency-based bands (90-14080 Hz), kick and tom have similar
    // bass/treble ratios. Use sub-bass proxy as primary discriminant.
 
    // Kick vs Tom: both have moderate bass. Sub-bass proxy separates them.
    // Kick has sub-bass body resonance (subBassProxy > 0.5), tom doesn't.
    if (mBassToTotal > 0.20f) {
        if (mSubBassProxy > 0.5f) {
            // Sub-bass present → kick-like, suppress tom
            mTomConfidence *= 0.3f;
        } else if (mSubBassProxy < 0.3f) {
            // No sub-bass → tom-like, suppress kick
            mKickConfidence *= 0.3f;
        }
    }
 
    // HiHat vs Snare: both have high treble. Discriminate by bass content.
    if (mTrebleToTotal > 0.60f && mBassToTotal < 0.12f) {
        mSnareConfidence *= 0.3f;
    }
 
    // Crash/broadband rejection: very high treble with no bass
    if (mTrebleToTotal > 0.70f && mBassToTotal < 0.10f) {
        mSnareConfidence *= 0.3f;
        mKickConfidence *= 0.2f;
        mTomConfidence *= 0.2f;
    }
 
    // Noise rejection: white noise has very low treble flatness (< 0.50)
    if (mTrebleFlatness < 0.50f && mTrebleToTotal > 0.40f) {
        mSnareConfidence *= 0.3f;
    }
 
    // Very high click ratio + high treble → hi-hat, not snare
    if (mClickRatio > 3.0f && mTrebleToTotal > 0.60f) {
        mSnareConfidence *= 0.3f;
    }
}

References mBassToTotal, mClickRatio, mKickConfidence, mSnareConfidence, mSubBassProxy, mTomConfidence, mTrebleFlatness, and mTrebleToTotal.

Referenced by update().

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