I do n’t even know if that ’s a title of respect , but I have a quick technical head about the radio interference chirps that are sent by phones flop before phone calls that can be heard in verbalizer or learn in CRT monitors . If you bonk what those are , could you email me at[email protected ] ? I ’d revalue it .
And since I ’m already wasting space , does anyone have a Verizon EVDO phone like the Samsung A890 ? Do you have problem with the articulation quality ?
Update : Wow , so many dependable answer already . Thanks , bozo . I ’ll send one of the responses after the jumping , along with a link to a more technical response .
Nathan Schmidt writes :
In a GSM system in finical , the pre - ring chirp you see are the phone negotiating with the serving tower for a dealings [ voice ] communication channel on a particular frequency stripe and timeslice ( versus the pre - allocated and share control channel ) to carry your conversation . If it ca n’t get the serve tower to apportion the duct , it wo n’t phone . likewise , if the telephone does n’t acknowledge the call ( you ’re temporarily in a basement or something ) the tower diverts to voicemail .
The control line is a fix frequency and only has enough capacitance to declare call and do some housework . dealings television channel are allocate on the tent-fly by the tower and the allotment exist only as long as a particular conversation .
The pre - tintinnabulation shows up more dramatically on your CRT because , as you might envisage , it ’s imperative that the initial acknowledgment stages get through to the tower , so the headphone is in core shouting . Once the voice portion of the call start the phone and tower lock into a tightly moderate oscillation of output power restraint , impart with only enough power to be distinguished from the background noise . This saves battery major power and keeps your head from catch too warm .
Consider this cognitive process happening over the course of a 2d or two :
tug : telephone set :
Call from ‘ xyz ’
Ok , I find out that . Where ’s the call ?
Channel 5.3
Ok
[ Ringtone begins ]
Also :
Question about cell phone interference[WiFi - Forum ]
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