Definition: | the frequency-weighted sound pressure level in decibels, obtained by a stated procedure that combines the sound pressure levels in the 24 one-third octave bands centred on 50 Hz to 10 kHz
NOTE 1 – The procedure is stated in ISO 3891-1978: Procedures for describing aircraft noise on the ground.
NOTE 2 – Perceived noise level is intended to approximate judged perceived noise level.
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