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Old 7th September 2011, 07:36 AM   #1
jerryo is offline jerryo  Isle of Man
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Default Aircraft PA quality

Everytime I fly anywhere I find myself having to stick my fingers in my ears as soon as any announcement is made on the PA system. The quality is so bad and so distorted that to me is unbearable.
In the last few years I have been on a variety of different types of airliner and the sound is "always" extremely bad.

Why is this? How can they get it so wrong?
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Old 7th September 2011, 11:07 AM   #2
mr l is offline mr l  Australia
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with aircraft audio systems, and mic audio for radio communications for that matter is band pass filtered from 300HZ to 3KHZ. reason being is that most of the voice intelligence is in that range. some of the newer aircraft audio systems (flight, service and cabin interphone) are done by DSP (still in the limited range)
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Old 7th September 2011, 12:41 PM   #3
Pano is offline Pano  United States
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I would agree that's it's mostly the mic. Seems to be that way on so many public address systems. Shouting and eating the mic at the same time does not help, either.
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Old 7th September 2011, 01:38 PM   #4
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2 other things -- first -- older pilots will remember the VOX clicking in or out so will tend to eeeeelonnnngggate words to keep the red light on -- second -- eating the mic comes from trying to eliminate background noise. Some of the mics should be sprayed with listerine between useage.
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Old 7th September 2011, 02:21 PM   #5
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The loudspeaker you are listening to is designed to be as light weight and efficient as possible. What do you think it costs in fuel to fly one ounce a million miles?

Then the amplifier is as light as possible. So a heavy output transformer is not used.

Of course the input power voltage is at 400 cycles so you really don't want the audio to go that low. You think 60 cycle hum is bad, 400 cycle whine will drive you nuts!

Then there is the advantage you really are noticing the messages. So the system works!
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