Read out apparatus for reading out information from magneto-opti

Details Read out apparatus for reading out information from magneto-opti Read out apparatus for reading out information from magneto-opti

1993-09-02

1994-10-25

Young, W. R.

Dynamic information storage or retrieval

Binary pulse train information signal

Binary signal gain processing

369 13, 369110, 369124, G11B 700

Patent

active

053595866

ABSTRACT:
An apparatus for reading out data recorded on a magneto-optic disk by detecting edges of magnetic domains formed such that the direction of magnetization thereof is opposite to the direction of the magnetization initially formed on the magneto-optic disk, the edges of the magnetic domains corresponding to "1"s of the recorded data. The data read out apparatus includes a read out signal generation portion for generating a read out signal by scanning the magnetic domains on the magneto-optic disk, a binarization portion for converting the read out signal into a binarized signal, and an edge detection portion for detecting from the binarized signal a front edge signal and a rear edge signal corresponding to the front edge and the rear edge of the magnetic domains, respectively. A front edge signal from a fixed delay device and a rear edge signal from a variable delay device are input to an OR circuit and an edge signal is output therefrom. A phase-locked loop circuit generates a clock signal synchronized with the edge signal and this clock signal is used in a data separator for separating the data from the edge signal output from the OR circuit.

REFERENCES:
patent: 4894816 (1990-01-01), Sukeda et al.
patent: 5105399 (1992-04-01), Shimonou
patent: 5233589 (1993-08-01), Saito et al.
patent: 5235590 (1993-08-01), Taguchi et al.

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