perceived noise decibel


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perceived noise decibel

n
(Units) a unit for measuring perceived levels of noise by comparison with the sound pressure level of a reference sound judged equally noisy by a normal listener. Abbreviation: PNdB
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
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A 1976 report from the Working Group on Noise from Air Traffic shows the aircraft regularly exceeded the maximum permitted noise levels of 110 PNdB (perceived noise decibel).
Concorde breached noise limits for months after its launch
"The newer and later model aircraft are much better and more neighbourly." In the case of a four-engined aircraft with a certificated gross weight of 850,000lb (385,000kg) and over, ICAO's rules stipulate that the noise level at the measured 'flyover reference point', or 4 miles (6.5km) from the take-off roll, should not exceed 106 equivalent perceived noise decibels (EPNdB).
Keeping an ear to the sky: airport noise is actually reducing, thanks to the ever-tightening rules and system monitoring, but it will be a long time before life is noticeably quieter

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