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Is it really analog though? The audio might be analog, but they still have to "key" the mic which would be a digital input at the very least, or something even
by Nextgrid 4y ago
Is it really analog though?
The audio might be analog, but they still have to "key" the mic which would be a digital input at the very least, or something even more complex such as a phone-like system where handsets have actual keypads and internal numbers.
I wouldn't expect the amplifier to be active at all unless a "call" is in progress (otherwise you might hear a constant noise, plus energy saving/thermal concerns and all that), so even if there was interference around, it shouldn't be getting amplified to an audible level unless something is actually "keying" the mic.
- mirker 4y agoYeah, I don’t believe the system is analog end-to-end. Moving the audio signal to every speaker across the entire length of the plane with analog seems like a fight against physics.
- nullc 4y agowhat? analog PA systems that cross giant buildings or even campuses have been a thing for a long time. The traditional design uses a 70v or higher bus and a transformer at each speaker. I would be really surprised if the PA speakers we anything but that-- electronics at each speaker is a repair/failure rate headache.