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1/2 Speed Recording 7dB 7dB aircraft noise AMPEX anechoic chamber average bothersome or annoying Comparison and Magnitude comparison noises comparison test dBA Max E7dBM EdBD SD EdBDrt EdBE equal in accept Fixed Wing Jet Groups of Subjects jet aircraft judged judgment tests laboratory tests level of confidence magnitude estimation tests Max dBD2 Max Max PNL units Maximum dB7 measurement predicted Methods of Paired noise occurrence noise stimuli noisiness or unacceptability pair of sounds Paired Comparison paired-comparison test peak level perceived noisiness physical level physical measures physical noise measurement physical units Pink Noise PLdB PNdB PNdBM predicted the subjective presented Reference Standard S. S. Stevens Significant at 90 sound level meter sound pressure level standard noise Stanford Research Institute Statistical Significance subjective judgments subjectively equal test tape Tests of Statistical three groups units of measurement units of noise units of physical VST7L VSTOL noises whole noise