Abstract: Due to the incidence of complaints about HVAC duct rumble noise, ASHRAE sponsored some research to firstly, document the extent and degree of low frequency noise problems and secondly, to determine by means of psycho-acoustic testing, a method of assessment of such noise. This paper describes some of the results obtained in the second phase. Subjects listened to four HVAC stimuli with promi nent low frequency spectral peaks for an hour. Subjects rated the Loudness and Annoyance of these acoustic stimuli using the method of Magnitude Estimation. At lower frequencies, Loudness habituation was more rapid than Annoyance habituation at lower sensation levels, thus emphasizing and increasing the difference between Loudness and Annoyance. It appears that this effect increases with time so that longer noise exposures result in an increase in annoyance relative to loudness. The implications of this result with respect to assessment metrics are discussed.
Publication Year: 2004
Publication Date: 2004-01-01
Language: en
Type: article
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