perceived noise level


Also found in: Acronyms.

perceived noise level

[pər′sēvd ¦nȯiz ‚lev·əl]
(acoustics)
In perceived noise decibels, the noise level numerically equal to the sound pressure level, in decibels, of a band of random noise of width one-third to one octave centered on a frequency of 1000 hertz which is judged by listeners to be equally noisy.
References in periodicals archive ?
Subscale experiments showed that, relative to the mixed-flow exhaust, the coaxial separate-flow exhaust with vanes reduces the peak overall sound pressure level by 8 dB and the effective perceived noise level by 7 dB and the noise-equivalent specific thrust on take off is reduced from 490 to 390 m/s.
It differs from NEF in the way that it measures loudness as the maximum perceived noise level for each event.
The district court ruling referred to the Weighted Equivalent Continuous Perceived Noise Level (WECPNL), an environmental index gauging noise from airplanes, saying, ''The residents in the area with over 75 WECPNL suffer damage beyond tolerable limits.
Referring to Weighted Equivalent Continuous Perceived Noise Level (WECPNL), an international environmental index for airplane noise, Watanabe said in his ruling, ''The residents in the area with over 75 WECPNL suffer damage beyond tolerable limits.

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