Generating data detecting threshold levels from reference patter

Details Generating data detecting threshold levels from reference patter Generating data detecting threshold levels from reference patter

1995-10-20

1998-06-02

Edun, Muhammad N.

Dynamic information storage or retrieval

Binary pulse train information signal

Binary signal gain processing

369 50, 369 48, 369 13, G11B 700

Patent

active

057611718

ABSTRACT:
An optical disk, such as a magneto-optical disk, has data recorded in a spiral track or in concentric tracks which contain a reference pattern repeated in each of n blocks. The reference pattern of a block exhibits distinct amplitude levels from which are derived plural threshold levels that are used during a playback operation to detect reproduced data values. The levels of the reference pattern in each of the n blocks are sampled and used to produce at least two (e.g., higher and lower) threshold levels against which the data reproduced from the disk is compared to detect the values of such data.

REFERENCES:
patent: 5255127 (1993-10-01), Nakatsu et al.
patent: 5363352 (1994-11-01), Tobita et al.
patent: 5508993 (1996-04-01), Hagashi et al.

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