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Pages 89-92

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From page 89...
... 89 8.1 Construction Review for Room Acoustics As with many aspects of construction, some components of the architectural finishes that affect PA system speech intelligibility will require close and careful inspection during installation, but other components may only require a general review of construction practices or spot checks to document general conformance with the specifications. Ultimately, a properly designed and installed PA system within a suitably designed acoustic space can be fine-tuned during commissioning.
From page 90...
... 90 Improving Intelligibility of airport terminal public address Systems • Acoustical performance requirements – PA sound levels at listener positions – Off-axis sound levels – PA sound level uniformity – STI performance • Loudspeaker specifications • Loudspeaker spacing and placement (when crucial or unusual) • Environmental conditions – Temperature, humidity, etc.
From page 91...
... Construction phase 91 • Configuring and testing the functionality of the PA system • Balancing the PA system components • Configuring basic PA announcement settings • Configuring basic zone EQ settings • Verifying any communications services that are integrated with the PA system (e.g., telephone, Ethernet, fire, and others) • Checking loudspeaker polarity • Verifying loudspeaker line impedance • Checking hum and noise level • Verifying acoustical and electrical frequency response • Verifying signal-to-noise ratio (SNR)
From page 92...
... 92 Improving Intelligibility of airport terminal public address Systems minimize noise and signal distortion. Usually distortion is caused by overdriving the microphone preamplifier (e.g., the headend gain is too high)

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