What is a Scrambler (Except Wikipedia please)

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As far as I understand from wiki, it is a encoder-decoder block for cryptology things. however, my administrator said that it is used to keep a signal away from channel errors rather than hackers outside..i mean the main purpose of scrambling is making a signal more reasonable, such as filtering, eg. removing peak powers and recovering some loss part according to previous signal values..but i could not see such a description on the net.

can anybody please tell what a scrambler really is and what is it exactly used for?

thanks all!
 

The term SCRAMBLER originated in the electronics world as box capable of encoding radio tty transmition codes like AMTOR .Also encoding tv signals in such a way that only if you have the descrambler you could warch it it was a very crude type of encryption system .It was analog .You added some componnent to the signal or get the lines out of order .And reorganize or filter the signal in the descrambler. This days the term scrambler is also not well defined .But i means to encrypt some signal .Usually a tv or radio signal.

Regards
 


hmm. how does scrambler faciliate timing recovery?

Added after 9 minutes:

I think I got the point now. It is funny that I am gonna give a wiki reference now

https://en.wikipedia.org/wiki/Satellite_modem
read under "Scrambling" sub-title:

Scrambling is a technique used to randomize a data stream to eliminate long '0'-only and '1'-only sequences and to assure energy dispersal. Long '0'-only and '1'-only sequences create difficulties for timing recovery circuit. Scramblers and descramblers are usually based on linear feedback shift registers.

A scrambler randomizes the data stream to be transmitted. A descrambler restores the original stream from the scrambled one.

Scrambling shouldn't be confused with encryption, since it doesn't protect information from intruders.
 

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