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Bit de paritat

Bit de paritat és un mètode per a la detecció d'errors de transmissió o emmagatzemament de dades. Consisteix a afegir 1 bit per a cada paraula, on s'especifica si la quantitat de bits amb valor 1 de la paraula és parell o senar, és a dir, es fa la suma dels bits anteriors i es redueix a un bit.

Aquest mètode detecta els errors, però no els corregeix (només en el cas que la paraula transmesa sigui de mida 1 bit).

La paritat parell és un cas especial del control de redundància cíclica (CRC), on el bit de CRC es genera pel polinomi x +1.

Exemple de càlcul del bit de paritat

[modifica]
7 bits de dades byte amb el bit de paritat
parell imparell
0000000 00000000 00000001
1010001 10100011 10100010
1101001 11010010 11010011
1111111 11111111 11111110

Vegeu també

[modifica]
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Bit de paritat
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