Improving Intelligibility of Airport Terminal Public Address Systems (2017) / Chapter Skim
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From page 18... ...
18 3.1 Introduction Although the acoustical requirements for airports are much less demanding than they are for other large public spaces (such as concert halls) , the same design tools are available to deliver acoustical success in airports as well.
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Speech Intelligibility 19 accuracy could be determined. One of the early methods of the second test was a subjective test called the "monosyllabic word intelligibility" test, which used spoken words and a group of listeners to test for intelligibility by measuring the number of words correctly identified.
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20 Improving Intelligibility of airport terminal public address Systems the test words and sentences, many listeners are recruited to give their assessment. Another disadvantage is that each listener may have language skills or physical conditions that color his or her ability to offer an unbiased result.
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Speech Intelligibility 21 was 13 dBA. The main point to understand here is that the preponderance of spaces had an SNR greater than 10 dB.
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22 Improving Intelligibility of airport terminal public address Systems research, developed the STI-for-PA method. United States and international standards exist to define specific measurements for speech intelligibility.
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Speech Intelligibility 23 against the SNR. The average STI value over all of these measurement locations was 0.51, which addresses the feasibility and practicality of achieving STI performance in conformance with the IEC 60268 VA target of 0.50.
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24 Improving Intelligibility of airport terminal public address Systems 3.7.2 Hearing Impairment, Age-Related Hearing Loss, and ADA Considerations Annex I of IEC 60268-16:2011 provides information on methods to adjust STI targets based on age and general assumptions about hearing impairment. The SNR should be increased by 4.5 dBA to provide the same quality of speech intelligibility for someone with a 20 dB hearing loss defined against the pure-tone average (PTA)
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Speech Intelligibility 25 given that noise is also amplified by hearing aids, it is not surprising that people with hearing aids opt to turn them down, relying more often on visual displays instead. Per the ADA (ADA Standards 2010)
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26 Improving Intelligibility of airport terminal public address Systems Measured daytime ambient conditions were on average 7 dBA higher than the nighttime conditions. Section 4.5 presents more discussion on ambient noise, and Section 6.6 presents guidance on controlling these sources.
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Speech Intelligibility 27 • Design STI: – Daytime (wet)
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