1. K. D. Kryter, J. Acoust. Soc. Am. 31 ... Perceived noisiness is scaled in so- called aquot;noyaquot; units, and perceived noise level is expressed in aquot;PNdbaquot; units; this is analogous with ... W. C. T.a#39; Copcland, I. M. Davidson, T. J. Hargcst. and D. \V. Robinson, A Controlled Experiment on the Subjective Effects of Jet Engine Noise.