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US 6,192,008 B1Granted
Device and method for reproducing record information from magneto-optical recording medium
AssigneeLG Electronics Inc.
InventorDae Young Kim
Life of this patent
Estimating the term…
Abstract
In a method and device for reproducing record information from a magneto-optical recording medium, reproducing light and an alternating magnetic field signal are applied onto the magneto-optical recording medium in order to detect the record information therefrom. Two or more reference values and detected reproducing signal are compared with each other, and based on the comparison, a binary high or a binary low is outputted as a reproduced bit signal. Meanwhile, if the detected reproducing signal signifies an error, a binary signal of a level opposite to a magnetization direction of its applied alternating magnetic field signal is outputted as the reproduced bit signal.
Claims17
A method for reproducing record information from a magneto-optical recording medium, comprising:
- radiating a reproducing light onto the magneto-optical recording medium;
- applying an alternating magnetic field signal simultaneously with the step for radiating, the alternating magnetic field signal being either a binary high corresponding to an upward magnetization or a binary low corresponding to a downward magnetization;
- detecting a resultant signal from the magneto-optical recording medium in response to the steps for radiating and applying;
- and
- converting the detected resultant signal into a binary signal, wherein the binary signal corresponds to a binary value opposite to the binary value of the alternating magnetic field when the detected resultant signal corresponds to neither a binary high nor a binary low.
2 more elements
A method for reproducing record information from a magneto-optical recording medium, comprising:
- (a) detecting an electric signal from the magneto-optical recording medium by radiating a reproducing light onto the magneto-optical recording medium and simultaneously applying an alternating magnetic field made up of a signal of an upward magnetization direction corresponding to a high binary signal and a signal of a downward magnetization direction corresponding to a binary low;
- (b) converting detected electric signal into a binary signal by comparing the detected electric signal with two or more reference values for deciding the binary high and the binary low;
- and
- (c) converting said detected electric signal into the binary signal opposite to a magnetization direction of its applied alternating magnetic field signal, when said detected electric signal does not correspond to any one among a binary high and a binary low in said step (b).
1 more element
A method for reproducing record information from a magneto-optical recording medium, comprising:
- (a) detecting an electric signal from the magneto-optical recording medium by radiating reproducing light onto the magneto-optical recording medium and simultaneously applying an alternating magnetic field signal made up of a signal of an upward magnetization direction corresponding to a binary high and a signal of a downward magnetization direction corresponding to a binary low;
- (b) changing said electric signal to a binary high when detected electric signal is over a first reference value for deciding the binary high and a binary low when said detected electric signal is below a second reference value for deciding the binary low;
- and
- (c) converting said detected electric signal into a binary signal opposite to a magnetization direction of its applied alternating magnetic field signal, when said detected electric signal exists between the first reference value and the second reference value in said step (b).
1 more element
A device for reproducing record information from a magneto-optical recording medium, comprising:
- an alternating magnetic field signal generating block for generating an alternating magnetic field signal made up of a signal of an upward magnetization direction corresponding to a binary high and a signal of a downward magnetization direction corresponding to a binary low;
- a reproducing light generating block for generating reproducing light;
- a reproducing block for detecting a reproducing signal from the magneto-optical recording medium by applying the reproducing light and the alternating magnetic field signal onto the magneto-optical recording medium;
- and
- a reproducing signal processing block for converting detected reproducing signal into any one signal out of the binary high and the binary low by comparing the detected reproducing signal with two or more reference values, and converting the detected reproducing signal into one binary signal opposite to a magnetization direction of applied alternating magnetic field signal when the reproducing signal is an error signal which is not contained into any one among the binary high and the binary low.
2 more elements
A method to read information from a magneto-optical medium, comprising:
- (a) applying a reading laser beam to a mark on said magneto-optical medium;
- (b) applying an alternating magnetic field to said mark, a direction of said alternating magnetic field alternating between states representing binary values one and zero;
- (c) detecting a read signal from said mark in response to steps (a) and (b);
- (d) outputting a corresponding binary value if said read signal detected in step (c) meets or exceeds threshold levels for one of binary one and binary zero, respectively;
- and
- (e) outputting a binary value opposite to said binary value of said alternating magnetic field if said read signal detected in step (c) does not meet or exceed said threshold levels.
3 more elements
A device to read information from a magneto-optical medium, comprising:
- a reading laser beam generator applying a reading laser beam to a mark on said magneto-optical medium;
- an alternating magnetic field generator applying an alternating magnetic field to said mark, a direction of said alternating magnetic field alternating between states representing binary values one and zero;
- a read signal detector detecting a read signal from said mark in response to operations of said reading laser beam generator and said alternating magnetic field generator;
- and
- a signal reproducer outputting a corresponding binary value if said read signal detected by said read signal detector meets or exceeds threshold levels for one of binary one and binary zero, respectively, and outputting a binary value opposite to said binary value of said alternating magnetic field if said read signal does not meet or exceed said threshold levels.
2 more elements
Dependencies are inferred from the claim text.