Does anybody know...

[Guest Laura]

You know how when youve got earphones on and your mobile rings you get that annoying noise in your ear from your phone? What is that?

[IMI]

I'm not sure I understand. You are wearing earphones listening to the radio? and you get static when your phone rings?

[Dudde]

you have an annoying ring-tone and your volume isn't turned up enough?

 

unless you're listening to the radio and the signal going into the phone is interfering with the radio signal or something?O_o...hmm...let's let the smart people answer this one

[Kedas]

call someone with your mobile and hold your phone close to your monitor.

(not very healthy for your monitor)

 

Your mobile is a strong transmitter.

[IMI]

Tis' true. I used to place my mobile on top of my alarm clock when I was sleeping. About a half second before the phone would ring I would hear a hiss from my alarm clock.

[Glider]

I know the sounds you're talking about. It's a series of fast blips in a pattern - -- - -- - -- - -- ------- like that. It's your phone sending our a 'recieve' signal in response to a request from the cell sending the incoming call.

[Guest Demosthenes]

It should probably be noted that headphones are really just tiny speakers, and speakers contain magnets.

 

Electronic signal sources (such as an incoming call on a mobile phone) very near to magnets can cause signal interference that could come across as audio "beeps" or static if you have current flowing to them (i.e., if you are listening to music at the time your phone rings).

[NavajoEverclear]

hey that reminds me of a time i was disecting an old phone, and the reciever where sound comes from, was nothing more than a coil of thin copper thread in between two circular magnets. How does that produce sound?

[YT2095]

Some good questions!

Let`s start with some basic Physics 1`st and then build on that

1. when an electrical current, passes through a conductor (a wire) it generates a magnetic feild.

 

2. the opposite can happen also, when a magnet is passed over a conductor a wire) it will generate and electrical current.

 

if the wire is in a coil shape it will intensify the effect. have you ever seen 2 magnets together, and depending on which way you have them together, they will either try and fly appart or stick together.

when the electrican signals from your musik enter this coil it makes a changing magnetic feild when put by a normal fixed magnet, the coil with then try to atract and repel against it in perfect time to the music. now since the coil is so light and delicate, it needs to be held in place, this is usualy done by a cone of paper or plastic, as the coil makes it`s tint movement, they also move this cone which is much bigger, and then you hear the music because the cone is pushing alot more air than the delicate coil alone could.

 

now along comes a mobile fone. they transmit regularly to check for signals etc... but they transmit at a VERY high frequency almost in the microwave band. although this is`nt alot of power it`s very penetrating and is quite easily blocked. when a conductor blocks some signal, that signal becomes an electrical current, and as you`ve read above, that electrical current can often be used to make sounds.

 

hope that helps a little?

[rebeldog]

It is the satelite or mast transmiter communicating with your phone.