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Z-channel (information theory) : ウィキペディア英語版
Z-channel (information theory)
A Z-channel is a communications channel used in coding theory and information theory to model the behaviour of some data storage systems.
== Definition ==
A ''Z-channel'' (or a ''binary asymmetric channel'') is a channel with binary input and binary output where the crossover 1 → 0 occurs with nonnegative probability ''p'', whereas the crossover 0 → 1 never occurs. In other words, if ''X'' and ''Y'' are the random variables describing the probability distributions of the input and the output of the channel, respectively, then the crossovers of the channel are characterized by the conditional probabilities
: Prob = 1
: Prob = ''p''
: Prob = 0
: Prob = 1−''p''

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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