Encoder for digital data storage

G - Physics – 11 – B

Patent

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Details

G11B 20/10 (2006.01) G11B 5/02 (2006.01) G11B 20/14 (2006.01) G11B 20/18 (2006.01) H03M 13/15 (2006.01) H03M 13/47 (2006.01)

Patent

CA 2246423

A variable rate bit inserter is provided which efficiently encodes data prior to writing to a magnetic storage medium. In a preferred embodiment, the bit insertion technique monitors the phase and amplitude content of the data stream and inserts appropriate bit patterns to ensure that phase and amplitude lock are maintained on the data stream for reading and decoding purposes. Preferably the number of bit insertions made on a given randomized block of data is monitored to determine if the number of bit insertions falls within the tolerable limits for storing the data. If the number of bit insertions is not tolerable, the pseudo-random code used to randomize the data stream is reconfigured.

L'invention concerne un dispositif d'insertion de bits à cadence variable codant des données avant leur enregistrement sur un support magnétique. Selon un mode de réalisation préféré, la technique d'insertion de bits contrôle la phase et l'amplitude du contenu du flux de données et insère des configurations binaires appropriées garantissant que le flux de données conserve son blocage en phase et en amplitude pour la lecture et le décodage. De préférence, le dispositif s'assure en permanence que le nombre d'insertions binaires effectuées sur un bloc de données randomisé rentre dans les limites tolérables de stockage de données. Si le nombre d'insertions binaires n'est pas acceptable, le dispositif reconfigure le code pseudo-aléatoire utilisé pour randomiser le flux de données.

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