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.
Yeah, 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.
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.