SPL | = | sound pressure level, decibels (db) |
P | = | sound wave pressure, newtons/meter2 |
Pref | = | reference pressure or hearing threshold, newton/meter2 |
IL | = | intensity level, decibel (db) |
I | = | sound intensity, watt |
I0 | = | reference intensity or least audible sound level, watts |
PAV | = | average power, watt |
NPL | = | noise pollution level, decibel (db) |
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