Method and apparatus for retreiving data from a storage device

Details Method and apparatus for retreiving data from a storage device Method and apparatus for retreiving data from a storage device

G - Physics

11

B

G11B 20/10 (2006.01) G11B 7/0037 (2006.01) G11B 7/0045 (2006.01) G11B 7/005 (2006.01) G11B 11/105 (2006.01) G11B 13/04 (2006.01) G11B 7/013 (2006.01)

Patent

CA 2148748

An apparatus and method for retrieving densely stored data from various types of magnetic media. A medium is scanned to provide an input signal. The input signal is conditioned through differentiation, equalization and partial integration. Positive and negative signal peak detectors are connected to the conditioned signal, and a threshold signal is generating corresponding to an average or midpoint of the measured positive and negative signal peaks. An output signal is generated by comparing the conditioned signal and the threshold signal. The DC component of the input signal is accounted for by feeding back the output signal and adjusting the threshold signal based on the duty cycle of the output signal.

L'invention est constituée par un appareil et une méthode d'extraction de données stockées à grande densité sur divers types de supports magnétiques. Un support est balayé pour produire un signal d'entrée. Ce signal d'entrée est conditionné par des opérations de différentiation, d'égalisation et d'intégration partielle. Des détecteurs de crêtes de signal positives et négatives reçoivent le signal conditionné et un signal de seuil correspondant à la moyenne ou au point milieu des crêtes de signal positives et négatives mesurées est produit. Le signal de sortie est produit en comparant le signal conditionné et le signal de seuil. L'appareil de l'invention tient compte de la composante continue du signal d'entrée en utilisant une rétroaction et en ajustant le signal de seuil d'après le rapport cyclique du signal de sortie.

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