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.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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.
Caption: FIGURE 4: Preliminary sample survey flow chart to detect the perceived noise level.
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.''
According to this scale -- the weighted equivalent continuous perceived noise level -- noise in residential areas should not exceed 70.
The tests establish certified aircraft Effective Perceived Noise Levels (EPNLs) for each of the flight conditions: approach, flyover and sideline.
The company says the system and a single layer of 1/2-inch drywall board can reduce perceived noise levels by up to 65 percent compared to an uninsulated wall.

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