I don't understand how frequency multiplexing works on one cable (For example :a cable tv network that sends 100s of TV channels to a TV) I understand that we can mix frequencies, and then demultiplex them. But how does demultiplexing happen ? After mixing, we get a soup.(which contains the crusts & troughs of various channels added/subtracted) Let us assume that the crest formed by 2 inputs signals adds to give 5 volt. Now how does the receiver/filter know the original signals were 1V and 4V , 3V and 2V, or other various combinations ????