Method and apparatus for spectral analysis in a disk...

G - Physics – 11 – B

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G11B 20/02 (2006.01) G11B 5/012 (2006.01) G11B 20/10 (2006.01) G11B 20/22 (2006.01) G11B 20/24 (2006.01) G11B 27/36 (2006.01) G11B 5/00 (2006.01)

Patent

CA 2225955

A method of performing spectral analysis of signals recorded by a magnetic recording or storage system is provided using a modified channel chip of the system. The modified channel chip enables measurement of harmonic components of the recorded signal. The method is performed by reading the recorded periodic analog signal and converting the signal into a discrete time periodic signal. The discrete time periodic signal is digitally sampled at predetermined intervals, and the digital samples are selectively accumulated in a register (341) or registers of the channel chip. Incoming digital samples are accumulated by alternately being added and substracted (345) to contents of single register (341). The accumulated results represent summations used to determine harmonic coefficients of the recorded signal. The harmonic sensor includes an arithmetic unit and a register (341) or register for accumulating the digital samples.

L'invention concerne un procédé d'analyse spectrale de signaux enregistrés par un système d'enregistrement ou de stockage magnétique à l'aide d'un module canal modifié, celui-ci servant à mesurer les composantes harmoniques du signal enregistré. Le procédé consiste à lire le signal analogique périodique enregistré et à le convertir en un signal périodique temporel discret. Ce dernier signal est échantillonné numériquement à des intervalles donnés et les échantillons numériques ainsi obtenus sont cumulés sélectivement dans un ou des registres (341) du module canal. Les échantillons numériques entrants sont cumulés en étant alternativement ajoutés (354) au contenu d'un seul registre (341) et soustraits de celui-ci. Les résultats cumulés représentent les totalisations utilisées pour déterminer les coefficients harmoniques du signal enregistré. Le capteur d'harmonique comprend une unité arithmétique et un ou des registres (341) servant à cumuler les échantillons numériques.

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