Am Sa 26. Juli 2008 schrieb Dave Clark: > Jim Morris wrote: > > Dave Clark wrote: > > > > > >> Can you correlate the buzzing to your signal level? IIRC, most phones > >> will increase transmit power as needed to overcome noise. If the noise > >> is caused by RFI from the GSM radio, increased power would tend to > >> increase the interference. > >> > > > > I have a very low signal here one bar at most, I haven't tried it where there is good reception, as > > I can't really use it as a phone yet. However with that clue I'll try it ASAP in an area where I get > > better reception. > > > > FWIW my other Cell phones also get very low reception here, but don't have any noise. > > > > I hope if this is a H/W problem we can get it fixed even after the warranty expires as it definitely > > makes the phone a brick otherwise. > > > I know GSM transmissions can present significant interference on audio > equipment - if my phone (any GSM phone) is on my desk, I can hear > periodic static in my computer speakers as the phone "checks in" with > the cell tower - it sounds like three quick, buzzes in about 1 second. > This happens a couple times an hour. > > When it receives a call, I get a steady buzz starting 1 to 3 seconds > before the phone rings, and continuing until I hang up. > > I would imagine that ALL cell phone hardware would have to deal with > this audio interference, and since I don't hear it in many other phones, > I'm pretty sure it can be filtered out with some sort of audio processing.
Nope, it has to be stopped on RF-side, before even entering audio-path. For this we have to spot the exact way RF is entering back to the device. That's what we're about to do. /jOERG
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