Timeline for Why is the sound quality of onboard public address so bad?
Current License: CC BY-SA 3.0
12 events
| when toggle format | what | by | license | comment | |
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| Jun 1, 2015 at 10:50 | vote | accept | kebs | ||
| Jun 1, 2015 at 10:50 | |||||
| May 30, 2015 at 17:24 | comment | added | Carey Gregory | To me this is more of a 'how' than a 'why'. Public address systems are well-understood technology and it shouldn't be difficult to build ones in planes that work well, even under adverse sound conditions. Such sound systems would, however, be more expensive. I strongly suspect that is the 'why'. | |
| May 30, 2015 at 16:39 | history | edited | Airman01 | CC BY-SA 3.0 |
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| May 30, 2015 at 16:37 | comment | added | Airman01 | Sorry if it caused any inconvenience. It seems it was wrong the RF frequency interference part of my answer. What must be correct is the part that I found on the cited book, that is, the mode of operation of the aircraft PA system: either a bandpass filter or a notch filter. I edited my answer only keeping the referenced information. | |
| May 30, 2015 at 16:33 | history | edited | Airman01 | CC BY-SA 3.0 |
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| May 30, 2015 at 16:30 | comment | added | ithisa | This seems to be completely wrong. There is no way band-filtering sound can prevent interference with RF signals. The sound is transmitted over a narrow RF band anyway, the frequency distribution of the sound has nothing to do with the frequency of the RF signal. | |
| May 30, 2015 at 16:24 | comment | added | kebs |
The RF spectrum starts at frequencies of 3 kHz I never heard of any radio communication device using frequencies below 100 kHz... moreover in airliners ! Remember that VHF airband is around 100 MHz and long-range HF is around 2MHz.
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| May 30, 2015 at 16:20 | history | edited | Airman01 | CC BY-SA 3.0 |
Added reference
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| May 30, 2015 at 16:12 | comment | added | kebs | Are you sure about that ? You have any source ? Because what you describe is the standard "telephone" filtering (weather it is POTS or VoIp), and I don't see in any way how keeping a wider bandwith would interfere with radio comm. These are not at all the same freequencies! | |
| May 30, 2015 at 16:06 | comment | added | Thunderstrike | Looks like a nice answer but any chance you could add a source or reference to back this up? :) | |
| May 30, 2015 at 16:01 | history | edited | Airman01 | CC BY-SA 3.0 |
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| May 30, 2015 at 15:55 | history | answered | Airman01 | CC BY-SA 3.0 |