Multi-value recorded data detecting method

Details Multi-value recorded data detecting method Multi-value recorded data detecting method

1994-06-15

1995-11-21

Sugarman, Scott J.

Dynamic information storage or retrieval

Binary pulse train information signal

Binary signal gain processing

360 32, G11B 509

Patent

active

054694205

ABSTRACT:
A multi-value recorded data detecting method which can achieve accurate detection of multi-value data irrespective of a level variation or an amplitude variation of an input reproduction signal. A reproduction signal from a record medium, on which multi-value data are recorded, is converted from an analog signal into a digital signal in response to a reference clock signal to obtain signal level data. The signal level data are stored into memory means, and distribution information of the signal level data stored in the memory means are found out for each predetermined signal unit. Then, a threshold value or values are set in accordance with the distribution information, and the signal level data from the memory means are compared with the threshold value or values to obtain multi-value data.

REFERENCES:
patent: 4477926 (1984-10-01), Linger et al.
patent: 5134663 (1992-07-01), Kozlowski
patent: 5189650 (1993-02-01), Watanabe et al.

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