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AssigneeKoninklijke Philips Electronic, N.V.
InventorsCoen Verschuren, Willem Coene
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The present invention relates to a method and apparatus for controlling at least one readout parameter of a magneto-optical domain expansion recording medium. An average detected runlength of the reading signal is monitored, and an error signal is generated on the basis of a comparison of the monitoring result with the predetermined average runlength that has been set during the encoding step. The at least one readout parameter is then controlled by means of the generated error signal. Furthermore, the present invention relates to a method, apparatus and record carrier wherein a runlength constraint is applied to at least one of the following quantities: mark regions and space regions in said storage layer, said runlength constraint being selected to keep an accumulated runlength deviation from a predetermined average runlength within a predetermined range. The proposed runlength property and control scheme provide the advantage that all detected runlengths contribute to the error signal to make the response must faster and to reduce readout errors.
A method of controlling at least one readout parameter during a reading operation from a magneto-optical recording medium (10) comprising a storage layer and a readout layer, wherein an expanded domain leading to a pulse in a reading signal is generated in said readout layer by copying of a mark region from said storage layer to said readout layer upon heating by radiation power, said method comprising the steps of:
A method according to claim, wherein said pulse pattern corresponds to the user data recorded on said recording medium (10).
A method of recording data on a magneto-optical recording medium (10) comprising a storage layer and a readout layer, said method comprising the step of applying a code constraint to said recording data, said code constraint being selected so as to keep the accumulated deviation from a predetermined average runlength of at least one of the following quantities:
An apparatus for controlling at least one readout parameter during a reading operation from a magneto-optical recording medium (10) comprising a storage layer and a readout layer, wherein an expanded domain leading to a pulse in a reading signal is generated in said readout layer by copying of a mark region from said storage layer to said readout layer upon heating by radiation power, said apparatus comprising:
An apparatus according to claim, further comprising storing means (23) for storing information that defines a relationship between a value of said error signal and a value of the result of said comparison.
An apparatus for recording data on a magneto-optical recording medium (10) comprising a storage layer and a readout layer, said apparatus comprising code generating means (24) for applying a code constraint to said recording data, said code constraint being selected so as to keep the accumulated deviation from a predetermined average runlength of at least one of the following quantities:
A magneto-optical record carrier comprising a storage layer and a readout layer, wherein an expanded domain leading to a pulse in a reading signal is generated in said readout layer by copying of a mark region from said storage layer to said readout layer upon radiation heating with the help of an external magnetic field, and wherein a runlength constraint is applied to at least one of the following quantities:
Dependencies are inferred from the claim text.