Address mark detection circuit

Details Address mark detection circuit Address mark detection circuit

1980-09-04

1982-08-17

Canney, Vincent P.

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Address coding

360 53, G11B 509

Patent

active

043452809

ABSTRACT:
An address mark detection circuit for use in a magnetic disk data storage unit is disclosed which features a Mealy sequential machine for providing a sequence of logical steps for the testing of sampled data in the search for an address mark; comparison between a given address mark and sampled data is eliminated. In a preferred embodiment, the specific mark to be detected is a first high frequency field followed by a second lower frequency field. The data is repeatedly sampled, and a digital frequency detector is used to provide a two bit signal to the sequential machine for stepping it in a direction corresponding to the frequency of the sample. The circuit allows elimination of means for detection of rotational position sensing information from a dedicated disk surface and elaborate phase-locked-loop circuitry for generating a data rate clocking signal in favor of simple and reliable logic circuitry.

REFERENCES:
patent: 4120006 (1978-10-01), Nagami et al.
patent: 4189756 (1980-02-01), Ninomayi

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