Abstract
A laboratory experiment was carried out to evaluate the relative annoyance
of a low frequency noise and reference noises at the same dB(A) levels.
Four continuous fan noises centered at 80, 250, 500 and 1000 Hz were
used as exposure noises. A total of 98 test subjects were exposed
for 4 × 30 min periods to two of the exposure noises at two noise
levels, while studying. Questionnaires were subsequently used to
evaluate annoyance at noise levels between 40 and 70 dB(A). The results
indicate that the low frequency noise is more annoying than the reference
noises at levels over 40 dB(A). The set of equal-annoyance curves
obtained in this study showed that the dB(A) unit underestimated
annoyance for a broadband continuous low frequency noise by 3 dB
for levels around 65 dB(Lin) and by 6 dB for levels around 70 dB(Lin).
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