CM1.2 Flashcards by Louis Buttighoffer

Q

que vaut b

A

nb d’états

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Q

Qu’est ce que pi

A

Probabilité de chaque états

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Q

Formule de l’entropie (cas général)

A

I= -n somme (pilog2 pi)

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Q

Formule de l’entropie (équiprobabilite)

A

pi=1/b donc I= n*log2(b)

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Q

Quel message transport le plus d’info

A

Le message à symboles équiprobables

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Q

Que signifie H

A

Entropie moyenne

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Q

Formule de l’entropie moyenne

A

H= I/n= -somme (pilog2 pi)

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Q

Formule de l’entropie moyenne (si équiprobabilite)

A

H= log2(b)

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Q

Formule du débit informationnel

A

C= I/ teta
En sh/s

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Q

Entropie moyenne de l’alphabet

A

1 Sh/symbole

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Q

Qu’est ce que B

A

Fréquence max utile

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Q

Formule de Hartley- Shannon-Tuller

A

C= B* log2(1+S/N)

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Q

Formule de HST pour [S/n]

A

C=1/3B[S/N]

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Q

Unité de [S/N]

A

Db

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Q

Unité de

A

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