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SlimJim
Posts: 17 |
 
Thu Jan 16, 2003 2:10 am |
Hi, I was wondering why GSM phones cause buzzing sounds in landlines and speakers? This doesn't happen with CDMA, TDMA, or analog phones... 
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DiscoStu
Posts: 18 |
Sat Jan 18, 2003 11:18 am |
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I'm not sure about this, but in Allen's reviews he talks about the vibrations of the phone in the GSM technology that causes the mobile phone to have sounds... maybe its the same when a mobile phone comes close to a landline.
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Bushy Turtle
Posts: 82 |
Sat Jan 18, 2003 8:58 pm |
I never realized it until I read this thread and tried it at my house. Now I'm curious as well... 
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migo
Posts: 8
Phone Model:
Samsung SCH-N150
Service Provider:
telus mobility |
Fri Jan 24, 2003 1:30 am |
I didn't realize it was GSM only. Now I know what type of network my girlfriend's phone runs on  I still don't know mine though since I've never had my phone on while using a land-line.
As for the reasons, it might have something to do with the frequency and/or electrical interference. I used to live on a farm and when we had the electric fence turned on there would be interference while using the radio on some frequencies as well as the phone. The interference from my girlfriend's cell phone sounds a lot like the interference from the electric fence.
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AzA
Posts: 6
Phone Model:
Nokia 8210
Service Provider:
Airtel |
Fri May 23, 2003 4:23 pm |
that BUZZZzzZzzz is coz'd by the electro magnetic waves emitted by the GSM fones while in use .... any instrument witha speaker has interference with it
Cheers
 AzA
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mza
Posts: 2
Phone Model:
6610
Service Provider:
telstra |
Wed Jun 25, 2003 6:40 am |
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so do computer monitors and tvs etc.
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cold fusion
Posts: 1 |
Wed Jul 16, 2003 5:07 pm |
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I also get the same effect with my nokia 3360 (tdma). It's electromagnetic interference, microwaves + technology(that doesn't use it) don't mix too well.
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Cfj
Posts: 21
Phone Model:
SE T610, T68i, T39m, T520m and lots of older models
Service Provider:
Telia Sonera Sweden |
Sun Aug 24, 2003 6:57 pm |
The real reason for the buzzing sound is just as stated above that the electromagnetic fields emitted from the phone induce a current in wires, for instance speaker cables. However the sound is the strongest when the phone is communicationg with the base where the modulated signal follows a predefined pattern (more below). The reason for us being able to hear this sound is a bit more complex. The carrier frequency and the modulation rate is much to high for us to pick up. The human ear can hear up to about 20 kHz. The sound we hear is the envelope (dont know if this is the correct English term), i.e. the outline of the modulated wave viewed in the time domain.
Hope this was a bit helpful and not too technical.
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freemans105
Posts: 3
Phone Model:
Samsung s 105
Service Provider:
t-mobile |
Thu Aug 28, 2003 11:25 pm |
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never really knoticed the buzzing until i read this post.
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gerio
Posts: 361
Phone Model:
iPhone, by Golly!! And a couple of Razrs
Service Provider:
Cingular & Cellular South |
Mon Jun 19, 2006 10:48 pm |
ALL mobile phone will radiate some RF into various devices with different effects, as in I used to have an old mixing console that I had to insure that no phones were within 6 or 7 feet from it. The shielding in the mixer was quite poor by today's standards.
The GSM phones have a much more pronounced effect. I had never heard a phone come through the radio in my pick-up before I got the Razr and it scared the crap out of me when it did it the first time. And while modern mixers are much better shielded, I don't know if anything can block a GSM's phone interference. Sometimes in crowded environments, that noise will suddenly come through the PA and I have to start pushing people away from the mixer to find it and get to stop.
It's kinda funny to be sitting here at the computer and hear that "tick-tick-tick-tick....TRRRRRRR!!!!" going off through the notebook speakers, and THEN the phone rings. But it's not so funny at, say a meeting of top brass at Nissan!
Geri O
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