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Web Audio R128 (LUFS) — Meter + Normalize (микрофон‑безопасная, SNR‑aware)

\n\n

\n \n

Проверка окружения

\n \n

\n Частая причина ошибки: недоступен микрофон (iframe/HTTP/блокировка)\n

Secure Context (HTTPS/localhost): —
Топ‑уровневое окно (не sandbox iframe): —
Permissions API (микрофон): — / статус: —
AudioWorklet поддерживается: —

\n Подсказка: запустите страницу по HTTPS или на localhost, откройте отдельно (не во встроенном фрейме), и разрешите доступ к микрофону в настройках сайта.\n

\n\n \n

Источник

\n \n \n Мониторинг (эхо к динамикам)\n

\n \n Файловый анализ — офлайн рендер без эха\n

\n\n \n

Цель и нормализация

\n Target (LUFS):\n \n \n Авто‑нормализация\n Учитывать SNR (гард)\n

\n Авто‑норм: плавная подстройка GainNode; SNR‑гард ограничивает усиление при низком SNR\n

\n SNR min:\n dB\n \n Гейт ниже шума:\n dB\n \n Запас к шуму (маржа):\n dB\n \n

\n SNR‑гард: выкл\n

\n\n \n

Показания (EBU Mode)

Momentary (0.4 s)

—

Short‑term (3 s)

—

Integrated (I)

—

Гейтинг BS.1770

Loudness Range (LRA)

—

динамичность LU

Sample Peak

—

0 dBFS = 1.000 (линейн.)

True‑Peak (TP)

—

≤ −1 dBTP (~0.891 лин.)

Relative Threshold

—

I_rel − 10 LU (гейт)

Noise floor (LUFS)

—

измеренный фон

SNR (дБ)

—

Short‑term − Noise

Нужен сдвиг: 0.0 dB (1.00×)

—

\n\n \n

Самопроверка и демо‑сигналы (не требуют микрофона)

\n \n \n + шумовой фон (для теста SNR)\n \n

\n Тест‑кейсы:\n

Если микрофон недоступен, «Микрофон» не падает: выводится причина.
Анализ файла обновляет I/S/M/LRA/TP и шумовой пол.
Тон/шум показывают SNR; при включении «+ шум» SNR падает, и SNR‑гард ограничивает усиление.
При SNR ниже порога гейт ослабляет фон на gateDepth dB вне речи.

\n \n Авто‑замер при тишине\n

\n\n \n

Отладка метрик

Сырые значения

\n \n

Подсказки интерпретации

Momentary / Short‑term: текущая и 3‑сек. громкость (LUFS).
Integrated: громкость всей программы, цель: −23/−16/−14 LUFS.
LRA: динамический диапазон (LU): чем больше, тем «неровнее» контент.
Sample Peak: пик по сэмплам. 1.000 = 0 dBFS (клип). Держите < 1.0.
True‑Peak: межсемпловые пики (oversampling). Рекомендован потолок ≤ −1 dBTP ≈ 0.891 лин.
Relative Threshold: порог гейта для учёта блоков при расчёте Integrated.

Полезные формулы

ΔGain(dB) = Target(LUFS) − Integrated(LUFS)
Gain× = 10^(Δ/20)
dBFS = 20·log10(linear); linear = 10^(dB/20)
−1 dBTP ≈ 0.891 лин.; −2 dBTP ≈ 0.794 лин.

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