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School/Analyse/Layers/1. Physical Layer.md
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@ -100,10 +100,19 @@ Distortion is the change that occurs in a signal that affects how the signal loo
For example talking to someone while behind a thick glass pane changes how you sound on the other side. For example talking to someone while behind a thick glass pane changes how you sound on the other side.
We can solve this by using a lower bit rate. Bit rate is kinda like We can solve this by using a lower bit rate. Bit rate is kinda like the information per second. This way the signal is less susceptible to distortion.
### Noise ### Noise
![[noise-signal.png]]
Noise is when data is added to a signal and therefore changing the data itself.
Analogy for this when you are listening to someone talk and somebody else is talking at the same time trough your conversation.
We can solve this by using a stronger signal (bit like talking louder).
This will reduce the impact noise has on the signal.
This is also called signal to noise ratio (SNR)

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