How do cable lines on telephone poles transmit and receive data along thousands of houses and not get interference?
In: Engineering
From every signal (like a song) you can always know how it changes **through time** (with the graph of a sound wave) **AND** how its **frequencies** changes (with a graph that has frequencies from 0 to infinity in x and their “loudness” or amplitude in y). You can always pass between these two graphs interchangeably.
Now, imagine that this is the graph of the **frequencies** of a song: |n____. The “n” covers the frequemcies of hearing range, so from 20Hz to 20000Hz. If you add other spectrums on it, you would not be able to separate them again, because they **overlap**. If you don’t want to overlap them, you can shift every spectrum a bit to the right and then sum them togheter, getting something like this: |nnnn___. After receiving this signal, you can isolate a single n that you are interested in and reposition it in its original position. From the graph of the frequencies you can then get the graph of the soundwave
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