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Title: A mixed-reality approach to soundscape assessment of outdoor urban environments augmented with natural sounds
Authors: Hong, Joo Young
Lam, Bhan
Ong, Zhen-Ting
Ooi, Kenneth
Gan, Woon-Seng
Kang, Jian
Yeong, Samuel
Lee, Irene
Tan, Sze-Tiong
Keywords: Engineering
Issue Date: 2021
Source: Hong, J. Y., Lam, B., Ong, Z.-T., Ooi, K., Gan, W.-S., Kang, J., ... Tan, S.-T. (2021). A mixed-reality approach to soundscape assessment of outdoor urban environments augmented with natural sounds. Building and Environment, 194, 107688-. doi:10.1016/j.buildenv.2021.107688
Project: COT-V4-2020-1
Journal: Building and Environment
Abstract: To investigate the effect of augmenting natural sounds in noisy environments, an in-situ experiment was conducted using a mixed-reality head-mounted display (MR HMD). Two outdoor locations close to an expressway were selected for the experiment. A natural sound (birdsong or stream) along with a hologram (sparrow/fountain or loudspeaker) was projected through the MR HMD. Participants were asked to adjust the natural sound levels to their preferred level under ambient traffic noise conditions at each location. Participants also assessed the perceived loudness of traffic (PLN) and overall soundscape quality (OSQ) in conditions with and without the augmented natural sounds. The results showed that both natural sounds significantly reduced the PLN and enhanced the OSQ. No significant differences in subjective responses were found between the loudspeaker and visual representations of the natural sound source as holograms. Analysis on the preferred signal-to-noise ratio (SNR), i.e. ratio of natural sound to traffic levels, indicated a strong negative correlation between the preferred SNRs and ambient traffic noise levels. Overall, the preferred SNR of the birdsong was significantly higher than that of the water sound. Among the acoustic parameters tested, the A-weighted traffic noise level was the strongest predictor for the preferred SNR of both the birdsong and water sound. However, the correlation for the water sound was relatively higher than the birdsong. This was due to the larger variance in the subjective evaluation for the birdsong.
ISSN: 0360-1323
DOI: 10.1016/j.buildenv.2021.107688
DOI (Related Dataset): 10.21979/N9/KE0901
Rights: © 2021 Elsevier Ltd. All rights reserved. This paper was published in Building and Environment and is made available with permission of Elsevier Ltd.
Fulltext Permission: embargo_20230531
Fulltext Availability: With Fulltext
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