What is necessary for a good acoustical design for Metro Stations/Airports?

Announcements made on Public Address (PA) System should be clearly heard at ALL locations.

What it needs:

Reverberation Time between 0.7 to 1.2 seconds.

Proper Speaker Positioning to achieve Speech Transmission Index of more than 0.54 measured inside Metro Station/Airport.

Sufficient Acoustical Absorption should be provided so that the chaotic noise created due to the presence of 1000+ people in a particular area is absorbed.

Acoustical design of the metro station/airport should be done so that fluttering echoes are not triggered.

At any particular location, the Sound Pressure Level of the reflected component of sound from walls/floor/ceiling should not exceed the direct sound reaching that spot.

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