What is the purpose of using a scrambler in communication systems? The link wiki_for_scrambling says that it is used to randomize data. But the data is already random (like speech,audio,video,etc..), what is the purpose of randomizing again?
Even if we ex-or the sequence for randomizing? does it guarantee a non-repeating pattern?
And regarding the statement "Scrambler removes dependency of a signal's power spectrum on the actual transmitted data." in the article, what is the use of that?.
regards, phani tej