Subjects compared, in a special laboratory chamber, the sub-jective acceptability or noisiness of sonic booms (simulated) that would be heard outdoors and indoors with the sound of subsonic jet aircraft and bands of filtered white noise. The subjective acceptability of the booms was expressed in terms of equivalent perceived noise level in PNdB. (The use of this procedure does not imply that a "PNdB" value can, or should, be calculated for a sonic boom;the PNdB values used refer to the calculated peak perceived noise level of the flyover sound of a subsonic jet aircraft that is judged to be subjectively as acceptable as a given sonic boom.)
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