US 5,001,692 AGranted

Optical recording system providing a recording signal waveform adapted to the recording characteristics of the record carrier, and recording apparatus and record carrier for use in such systems

AssigneesU.S. Philips Corporation, Philips DuPont

InventorsMartin A. J. P. Farla, Henricus T. L. P. Stockx, Johannes J. Mons, Wilhelmus P. M. Raaymakers, Fransiscus L. J. M. Kuijpers

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Abstract

An optical recording system wherein the record carrier is pre-recorded with adjustment information indicative of the waveform of the write signal (V.sub.s) to be employed for recording an information signal (V.sub.i) thereon. The recording apparatus includes a read/write head for reading the adjustment information before recording, and a control circuit for deriving the write signal (V.sub.s) from the information signal (V.sub.i). The control circuit includes an adjustment circuit which selects a write signal waveform in conformity with the adjustment information read from the record carrier.

Claims16

Dependent claims

A system for recording a digital information signal on an optical record carrier, the information signal being in the form of successive sequences of bits of the same logic value, each such bit sequence being recorded as a recording mark of modified optical properties on the record carrier having a length corresponding to the number of bits in the bit sequence;

said system comprising:
a record carrier having optically readable adjustment information thereon signifying whether a sequence of write pulses for recording a bit sequence should include write pulses in addition to write pulses corresponding to the bits of the bit sequence in order to produce on the record carrier a recording mark which correctly represents said bit sequence, said adjustment information further signifying the number and relative positions of such additional write pulses in the complete write pulse sequence;
and
recording apparatus comprising read means for reading the adjustment information from the record carrier prior to recording an information signal thereon, and a control circuit which in accordance with the so-read adjustment information converts each of said bit sequences into a sequence of write pulses for producing a corresponding recording mark on the record carrier;
said control circuit comprising:
a write pulse generator for converting each successive bit sequence of the information signal into a sequence of write pulses for producing a recording mark on the record carrier constituted by a series of overlapping sub-marks formed by the respective write pulses;
and
adjusting means responsive to said adjustment information read from the record carrier to control said write pulse generator so that each sequence of write pulses for a bit sequence includes, in addition to pulses corresponding to the bits of such bit sequence, additional pulses of a number and at positions in the write pulse sequence as signified by said adjustment information.

5 more elements

Apparatus for recording a digital information signal on an optical record carrier having a recording layer with a predetermined optical property, the information signal being in the form of successive sequences of bits of the same logic value, each such bit sequence being recorded as a recording mark on said recording layer wherein said optical property is modified and having a length corresponding to the number of bits in such bit sequence;

the optical record carrier having optically readable adjustment information thereon signifying whether a sequence of write pulses for recording a bit sequence should include, in addition to pulses corresponding to the bits of the bit sequence, additional pulses in order to produce on the record carrier a recording mark which correctly represents such bit sequence, the adjustment information further signifying the number and relative positions of such additional pulses in the complete write pulse sequence;
said apparatus comprising:
read means including a read/write optical head for reading the adjustment information from the record carrier prior to recording information thereon;
and
a control circuit which in accordance with the so-read adjustment information converts each of said bit sequences into a sequence of write pulses for producing a corresponding recording mark on said record carrier;
said control circuit comprising:
a write pulse generator for supplying to said optical head successive sequences of write pulses corresponding to successive bit sequences of the information signal, each write pulse sequence causing said optical head to form a sequence of sub-marks on said record carrier which overlap to form a recording mark representing the corresponding bit sequence of the information signal, each write pulse corresponding to a predetermined number of successive bits in said bit sequence;
and
adjusting means responsive to said adjustment information read from said record carrier to further control said write pulse generator so that each sequence of write pulses produced thereby includes additional pulses, the number and relative positions of such additional pulses in a write pulse sequence being as signified by said adjustment information.

6 more elements

Dependencies are inferred from the claim text.

Facts

Application: 07/538,587Filed 14 Jun 1990 · continuation
Priority: NL 870093421 Apr 1987
Granted: 19 Mar 1991
Term ends: Not estimatedThe source records don’t support an estimate.

Classification9 codes

G11B 11/10528
Characterised by the transducing operation to be executed: shaping of magnetic domains, e.g. form, dimensions
G11B 7/004
Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the…:…
G11B 7/013
Arrangement of the information on the record carrier, e.g. form of tracks , actual track shape, e.g. wobbled, or cross-section, e.g. v-shaped;…:…
G11B 11/10597
Control of operating function: adaptations for transducing various formats on the same or different carriers