What is it about?
The emphasis of the present study is the interpretation of the NACF decay rate as an indicator of the degree of continuity of the noise levels for the complex noise environment. It did report that, according to their measurements, larger variations in decibels were perceived as less noisy.
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Why is it important?
The results of this study resemble previous studies that had assumed that a larger fluctuation of noise level corresponds to less annoyance experienced for mixed traffic noise studied in a laboratory situation. As an advanced approach, for hospital noise that consisted of 12 audible noise events, subjective noisiness were evaluated by the noise time structure analyzed by autocorrelation with loudness and levels variation.
Perspectives
The conventional studies concluded that the average loudness, N, better correlates to annoyance ratings than the percentile value of loudness N5 and that N can be used a noise index for time-varying noise. However, their noise structures were artificially created in a laboratory from single source (such as vehicle pass-by) recordings. They do not seem capable of representing community noise, which is defined by WHO (Berglund et al., 1999, page 55) as noise emitted from all sources, including road-traffic, industries, construction, public work, and neighborhoods; i.e., the real noises which occur in our environments.
Professor Chiung Yao Chen
Professor, Dept. of Architecture, Chaoyang University of Technology
Read the Original
This page is a summary of: Characterizing Subjective Noisiness in Hospital Lobbies, Archive of Mechanical Engineering, January 2015, De Gruyter,
DOI: 10.1515/aoa-2015-0026.
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