abstract:Descramble in Cable television context is the act of taking a scrambled or encrypted Video Signal one that has been processed by a scrambler and provided by a Cable Television company for Premium television services and is then supplied over a Coaxial cable and delivered to the household where a Set-top box reprocesses the signal, thus descrambling it making it available for viewing on the Television set. A descrambler is a device that restores the picture and sound of a scrambled channel.
This paper describesthe architecture andprincipleof DITS system. The problemsaboutcoding, filtering, equalization, scramble and descramble are discussed in detail.