2 ms·
The timing sounds like RF interference. I worked in TV a while back, and we were not allowed to have any cell phones (even silenced) on set - they would introdu
by azernik 9y ago
The timing sounds like RF interference. I worked in TV a while back, and we were not allowed to have any cell phones (even silenced) on set - they would introduce this crackling sound into lightly-shielded cables near them. The interference would kick in about a second or two before the ringing started, because there's probably some handshake/setup before the receiving phone decides it's actually an incoming call.
In that case too, sending calls didn't trigger the interference, and neither did picking up the received call.
- digi_owl 9y agoMy layman understanding of the old GSM network is that cells have a control channel that is used to set up calls (and initially also transfer SMS, before it became popular enough to DOS the cells) and then a bunch of channels for handling the actual calls. It may well be that the control channel's initial "wakeup" transmission is done at a very high power to ensure the phone receives it clearly, and then after some back and forth the two adjust their power levels and move to a different channel for the actual call.
- azernik 9y agoInteresting! Would explain why sending a call doesn't push out as much power.
- brusch64 9y agoI do the same thing in recording studios. You have to turn off your phone completely. Nothing worse than ruining a good take when you receive a call.