data scrambler - definitie. Wat is data scrambler
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Wat (wie) is data scrambler - definitie

TELECOMMUNICATION SCRAMBLING DEVICE
Descrambler; Unscramble; Scrambler (randomizer); Additive scrambler; Multiplicative scrambler; Self-synchronizing scrambler; Synchronous scrambler; Telephone scrambler; Descramble; Whitening sequences
  • DVB]]
  • A multiplicative descrambler used in V.34 recommendation
  • A multiplicative scrambler used in V.34 recommendation

unscramble         
¦ verb restore or convert to an intelligible or readable state.
Derivatives
unscrambler noun
scrambler         
(scramblers)
A scrambler is an electronic device which alters the sound of a radio or telephone message so that it can only be understood by someone who has special equipment.
N-COUNT
descramble         
¦ verb restore (a signal) to intelligible form.
Derivatives
descrambler noun

Wikipedia

Scrambler

In telecommunications, a scrambler is a device that transposes or inverts signals or otherwise encodes a message at the sender's side to make the message unintelligible at a receiver not equipped with an appropriately set descrambling device. Whereas encryption usually refers to operations carried out in the digital domain, scrambling usually refers to operations carried out in the analog domain. Scrambling is accomplished by the addition of components to the original signal or the changing of some important component of the original signal in order to make extraction of the original signal difficult. Examples of the latter might include removing or changing vertical or horizontal sync pulses in television signals; televisions will not be able to display a picture from such a signal. Some modern scramblers are actually encryption devices, the name remaining due to the similarities in use, as opposed to internal operation.

In telecommunications and recording, a scrambler (also referred to as a randomizer) is a device that manipulates a data stream before transmitting. The manipulations are reversed by a descrambler at the receiving side. Scrambling is widely used in satellite, radio relay communications and PSTN modems. A scrambler can be placed just before a FEC coder, or it can be placed after the FEC, just before the modulation or line code. A scrambler in this context has nothing to do with encrypting, as the intent is not to render the message unintelligible, but to give the transmitted data useful engineering properties.

A scrambler replaces sequences (referred to as whitening sequences) with other sequences without removing undesirable sequences, and as a result it changes the probability of occurrence of vexatious sequences. Clearly it is not foolproof as there are input sequences that yield all-zeros, all-ones, or other undesirable periodic output sequences. A scrambler is therefore not a good substitute for a line code, which, through a coding step, removes unwanted sequences.