Why do speakers emit buzzing noises when receiving a text?

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Discussion Overview

The discussion revolves around the phenomenon of speakers emitting buzzing noises when a text message is received on a mobile phone. Participants explore the relationship between electromagnetic waves, signal transmission, and the interaction between mobile phones and speakers, touching on concepts from electromagnetism.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification

Main Points Raised

  • One participant notes the buzzing sounds from speakers when receiving a text and questions the underlying electromagnetic principles, suggesting a possible link between the phone's signals and the speakers.
  • Another participant proposes that the phone may be emitting a signal that interacts with the speakers, indicating that this could be the most likely explanation.
  • A further inquiry is made about the specific hardware in phones responsible for emitting signals, leading to a discussion about the transmitter used for cellular communication.
  • It is mentioned that phones maintain regular communication with cellular towers, which is essential for location tracking and message delivery.
  • One participant shares personal experience of hearing similar buzzing sounds during incoming calls, suggesting a broader occurrence of this phenomenon.

Areas of Agreement / Disagreement

Participants express some agreement on the idea that the phone emits signals that may cause the buzzing in speakers, but the exact mechanisms and details remain uncertain. There is no consensus on the specific processes involved.

Contextual Notes

The discussion includes assumptions about the nature of electromagnetic waves and the functioning of mobile phone transmitters, but these assumptions are not fully explored or resolved.

Who May Find This Useful

Individuals interested in the interaction between electronic devices, signal transmission, and basic principles of electromagnetism may find this discussion relevant.

BOAS
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Hello,

I have a question or two that I suppose will include the nature of light and how that links to electromagnetism.

Sitting at my desk doing some work, listening to music over my speakers, I get a text. But I know I'm about to receive the text before my phone vibrates, because my speakers emit a series of buzzing/beeping noises.

So, what's going on here?

I have a few half baked ideas in my head, but it's been a while since I did electromagnetism in school and I don't start studying it at uni until january, so my memory is rather fuzzy on the subject + we never did look at how light is related to electricity and magnetism, though the name 'electromagnetic wave' certainly suggests that it is.

I remember the picture of an EM wave from my textbook that looked like a wave oscillating 'up' and 'down', with another (can't remember if it was phase shifted) moving in the 'left' and 'right' directions. I know the moving a wire through a magnetic field can induce a current, so is there a tiny magnetic field involved with the broadcast of my text message that can induce a current in my speakers?

Or perhaps I have it backwards and my phone is emitting some kind of 'receipt'.

Thanks for any light you can shed on the matter :)

BOAS
 
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BOAS said:
Or perhaps I have it backwards and my phone is emitting some kind of 'receipt'.
That is the most likely explanation. Try moving your phone closer or farther away from the speakers and see what happens.
 
tfr000 said:
That is the most likely explanation. Try moving your phone closer or farther away from the speakers and see what happens.

I'll have to wait for someone to text me, but it doesn't look like i'll be moving from my desk much today.

Do you know what the bit of hardware is that is responsible for emitting signals from a phone?
 
BOAS said:
I'll have to wait for someone to text me, but it doesn't look like i'll be moving from my desk much today.

Do you know what the bit of hardware is that is responsible for emitting signals from a phone?

Yes the transmitter that is used to get your phone signal back to the cellular tower

Your phone and the cellular tower are in almost constant ( at least, very regular) communication
There is polling going on so that the cellular system knows where your phone is located in the network so that it knows which base station tower to send any comms to your phone
This is really critical when you are on the move, say in your car, heading across town. You may move through several base tower coverage areas

Edit: I have also heard that buzzing/burbling set of tones even as an incoming call is coming in

cheers
Dave
 

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