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Mains Frequency Estimator

Harmonics-aware, EMA averaging (up to 60s), and a 5s warm-up gate before decisions. **Prefers 2× (100/120 Hz) over fundamentals** to handle mic high-pass filtering.
Âm thanhnhàn rỗi Samptỷ lệ le Block/Hop Cập nhật Bộ vi xử lý
Khởi động 5s Warm-up progress 0.0 giây
Decision is withheld until at least 5.0 giây of analyzed frames accumulate. After that, the classifier uses EMA-smoothed evidence where the 1st harmonic (2×) is weighted above the fundamental.
Phán quyết
Sự tự tin
Chất lượng
50 Hz series
60 Hz series
Spectrum bars
Thick = fundamental; thin = harmonics; faint = detected peak offset
50-score (avg)
60-score (avg)
50 Hz evidence
Làm hạiHzdB*ConfTrung bình
60 Hz evidence
Làm hạiHzdB*ConfTrung bình
Weights emphasize the 1st harmonic (2×) over the fundamental. Useful when microphones attenuate 50/60 Hz.