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http://dx.doi.org/10.7731/KIFSE.2019.33.1.130

Acoustic Characteristic of Emergency Broadcasting Speakers  

Jeong, Jeong-Ho (Fire Insurers Laboratories of Korea)
Seo, Bo-Youl (Fire Insurers Laboratories of Korea)
Park, Kye-Won (Fire Insurers Laboratories of Korea)
Shin, Yi-Chul (Fire Insurers Laboratories of Korea)
Hong, Won-Hwa (School of Architecture, Kyungpook National Univ.)
Publication Information
Fire Science and Engineering / v.33, no.1, 2019 , pp. 130-137 More about this Journal
Abstract
In this study, the acoustic characteristics of 13 types of emergency broadcasting speakers were tested under the test set-up of UL 2043 and compared. When the sound pressure level of 1 W speakers was compared with speakers with a 15 W output, the SPL of the 15 W speakers was approximately 20 dB higher in some frequency bands. Loudness analysis showed that people can recognize emergency sound from a 15 W speaker twice as loud as the emergency sound from 1 W speakers. The analysis results on the articulation index (room) had an opposite tendency with loudness results, meaning that small speakers can generate clearer sound. Therefore, it is necessary to improve emergency broadcasting speakers to generate louder and clearer sound. Moreover, a performance evaluation standard is needed based on the reasonable and quantitative measurements and evaluations of the acoustic characteristics of the emergency-broadcasting speakers so that a sufficient and clear sound can be generated in various spaces. In addition, it is necessary to establish standards for the clarity of emergency broadcasting in various spaces.
Keywords
Emergency broadcasting speaker; Sound pressure level; Loudness; Articulation index;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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