CATEGORY SCALING JUDGMENT TESTS ON MOTOR VEHICLE AND AIRCRAFT NOISE.
BOLT BERANEK AND NEWMAN INC VAN NUYS CALIF
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Subjects were asked to rate on various adjective category scales the sounds produced by aircraft flyovers and motor vehicle drivebys. Recorded sounds were rated by college students and community residents at locations near a highway and two airports. The laboratory tests indicated that all of the category scales were similar in their relationship with acoustical measures, although, in general, the noisiness scale exhibited the highest correlation. The correlations between the noisiness scale and various acoustical measures for the laboratory and field tests were all about equal, with perceived noise level, calculated or estimated from N-level measurements, exhibiting the highest correlation, followed by loudness level and A-level. The lowest correlation was exhibited by overall sound pressure level. Both the laboratory and field results were in good agreement and indicated little difference in ratings vs level among various sound stimuli employed during the tests. Agreement was good with the results of other investigators at the highest levels, diverging at the more moderate levels. These comparisons indicate the influence of stimulus range on the magnitude and slope of the relationship between the subjective rating vs a physical noise measure. Author