Apparatus for using window signal generators to enable detection

Details Apparatus for using window signal generators to enable detection Apparatus for using window signal generators to enable detection

1992-12-01

1994-10-04

Hajec, Donald

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Data clocking

G11B 509

Patent

active

053531752

ABSTRACT:
An improved apparatus for detecting address information recorded on a recording medium such as an optical-magnetic disc is disclosed. The header information is recorded on each sector of the disc recording medium and Is constituted by a sector mark indicating a head position of the corresponding sector, a plurality of address marks, and subsequent address information data. In a first preferred embodiment, a number of bytes starting from an end position of the address information and ending at a head position of the address information is counted and an address information recognition circuit is provided so as to provide an address information recognition start signal for the address information recognition signal at a predicted position of the head position. The address Information recognition circuit extracts and recognizes the address information in accordance with the address information recognition start signal supplied from a recognition start signal generator when the address mark detecting circuit does not supply a head position detection signal. In a second preferred embodiment, a window signal used to detect the address mark is selectively changed according to the result of detection of the preceded sector mark and/or address information data.

REFERENCES:
patent: 3794987 (1974-02-01), Walonta
patent: 4618898 (1986-10-01), Young et al.
patent: 5012460 (1991-04-01), Popovich et al.
patent: 5068753 (1991-11-01), Kanegae
patent: 5083303 (1992-01-01), Yanagida et al.
patent: 5121262 (1992-06-01), Squires et al.
patent: 5163003 (1992-11-01), Kimura

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