Subjective and objective rating of spectrally different pseudorandom noises--implications for speech masking design

The Journal of the Acoustical Society of America
Valtteri HongistoLaura Rekola

Abstract

Artificial sound masking is increasingly used in open-plan offices to improve speech privacy and to reduce distraction caused by speech sounds. Most of the masking sounds are based on pseudorandom continuous noise filtered to a specific spectrum that should be optimized in respect with speech masking efficiency and comfort. The aim of this study was to increase basic understanding regarding the comfort. The second aim was to determine how well objective rating methods (15 different noise indices) predict the subjective ratings. Twenty-three subjects rated the loudness, disturbance, pleasantness, and six other subjective measures of 11 spectrally different noises in laboratory conditions. Speech was not present during the experiment. All sounds were presented at 42 dB LAeq within 50-10,000 Hz. Unexpectedly, the subjects were most satisfied with sounds having emphasis on low frequencies. A sound having a slope of -7 dB per octave increment resulted in the highest satisfaction. Changes in subjective ratings were reasonably well predicted by five noise indices, while many well-known noise indices frequently used in building design underperformed in this task. The results are expected to benefit in the design of masking sounds and o...Continue Reading

References

Feb 1, 1989·The Journal of the Acoustical Society of America·H L PickJ K Kearney
Nov 1, 1971·The Journal of the Acoustical Society of America·L L BeranekJ J Figwer
Aug 31, 2006·The Journal of the Acoustical Society of America·Brian R Glasberg, Brian C J Moore
Jul 24, 2008·The Journal of the Acoustical Society of America·Erica E Ryherd, Lily M Wang

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Citations

Oct 22, 2016·Work : a Journal of Prevention, Assessment, and Rehabilitation·Helena JahnckePatrik Sörqvist
Jan 3, 2020·The Journal of the Acoustical Society of America·Petra VirjonenJenni Radun
Aug 5, 2017·Frontiers in Psychology·Valtteri HongistoEvan Benway
May 16, 2020·Frontiers in Psychology·Tom Froese, Guillermo U Ortiz-Garin
Jul 1, 2019·The Journal of the Acoustical Society of America·Stephan Töpken, Steven van de Par
Sep 6, 2018·The Journal of the Acoustical Society of America·Valtteri HongistoLaura Rekola
May 4, 2020·The Journal of the Acoustical Society of America·Saana MyllyntaustaValtteri Hongisto

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