Improving Intelligibility of Airport Terminal Public Address Systems (2017) / Chapter Skim
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Pages 93-99
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From page 93... ...
93 C h a p t e r 9 9.1 Introduction This chapter presents the post-construction process (referred to as commissioning) for the PA system.
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94 Improving Intelligibility of airport terminal public address Systems 9.2 Overview Four steps have been identified in the overall process for PA system commissioning, as shown in Figure 9-1 (Cape and Smith 2005)
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Commissioning public address Systems 95 9.3.2 Optimization Optimization occurs during inspection and testing and is project specific, requiring the commissioning agent to be familiar with the operation of PA systems in large public spaces and the evaluation of speech intelligibility, optimizing and sound system testing. Although PA systems at shopping centers and transportation stations have elements that are sometimes similar to airports (e.g., large volume/high ceiling rooms, elongated spaces, and high ambient noise levels)
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96 Improving Intelligibility of airport terminal public address Systems 9.4.3 Loudspeaker Zone Equalization In addition to the steps listed in Chapter 8, consider that loudspeaker zone equalization settings are typically adjusted for good speech intelligibility. As discussed in Chapter 7, a natural-sounding system is desirable; this often requires some adjustment to the natural frequency response of the loudspeaker.
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Commissioning public address Systems 97 Leq. Document the level of each announcement source: standard recorded announcements and live announcements (e.g., gate announcements, fire department, paging, and text-tospeech)
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98 Improving Intelligibility of airport terminal public address Systems 9.4.5 Troubleshooting the Speech Intelligibility of the PA System Installation The following can be considered if the STI result is lower than the target goal: Signal level: The nominal gain setting for the input may be need to be adjusted higher. Determine whether the paging system microphone level or the prerecorded input levels need adjusting or additional equalization.
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From page 99... ...
Commissioning public address Systems 99 9.4.6 Considerations for Combination Emergency and Non-Emergency Systems Subject to local code requirements, the fire marshal can require tests of the emergency fire/mass evacuation cut-over system, which will require fire/emergency announcements and possibly STI measurements to evaluate adherence to Annex D of NFPA72 (NFPA 2016)
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