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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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cellphone question
If I leave my cell phone near my computer speakers I will hear occasional
buzzing, clicking, etc. Before the phone begins to ring, I hear a dah..dah.daahhhhh. I know this is RF interference being picked up by the amplifier in the speaker. If one were to record this sound with a microphone at 11 or 22Khz, would it be possible to obtain any information (usable signal) from the recorded audio? Thanks, |
#2
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cellphone question
"Mike Muderick" wrote in message news:smoSf.18848$wH5.9595@trnddc02... If I leave my cell phone near my computer speakers I will hear occasional buzzing, clicking, etc. Before the phone begins to ring, I hear a dah..dah.daahhhhh. I know this is RF interference being picked up by the amplifier in the speaker. If one were to record this sound with a microphone at 11 or 22Khz, would it be possible to obtain any information (usable signal) from the recorded audio? Thanks, If you could then clean up the audio into a reasonable digital waveform, in the right format, and somehow then get it into a cellphone provider's software package, then I guess that you could, but I'm not sure that it would tell you anything useful. AFAIK, it's just a response from the phone, to the question " OI !! Are you still there ? Yes ? OK, let's set up a channel 'cause I'm about to ring you " or something along those lines, sent by the last cell that the phone had become registered on. Perhaps others on here know a lot more about it, but I think that's something like I remember reading it. Of course, what you're hearing may not be a data stream as such, at all. It may just be as a result of the phone's RF output frequency hopping about all over the place on some kind of spread spectrum scheme. Again, others here might be able to give a better answer on that. Arfa |
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