Koninklijke Philips Corporation N.v.

Gerardus Rudolph Langereis

Benno Tieke

Constant Paul Marie Jozef Baggen

Willem Marie Julia Marcel Coene

Johannus Leopoldus Bakx

An optical record carrier recording method forms pits and lands by directing a radiation beam () onto a recording surface () of an optical record carrier (). The radiation beam for each pit to be recorded is set to at least one write power level (P) capable of forming a pit during a write power irradiation period () and, for each land between the pits, to at least one bottom power level (P) incapable of forming a pit during a bottom power irradiation period (). In order to embed bits of an additional LML channel in the main channel without increasing the overall jitter, the bottom power level (P) is temporarily raised to an LML land power level (P) during an LML land irradiation period () for forming an LML land, the LML land power level (P) being close to the write power level (P), and that the write power level (P) is temporarily lowered to an LML pit power level (P) during an LML pit irradiation period () for forming an LML pit, the LML pit power level (P) being close to the bottom power level (P).

Optical record carrier recording method and apparatus

A method is described for determining a set of recording pulse series parameters for recording information on an optical record carrier. First a series of test patterns is written on the record carrier with a values of the parameters. On reading the test patterns, the jitter values of each read signal is determined. The optimum values of the parameters are derived from a linear dependence between the set of recording pulse series parameters and the relative jitter values. The invention relates also to a device arranged to perform the method. The invention further relates to an optical record carrier comprising the optimum recording power as determined by the method according to the invention.

Method and device for determining a set of recording pulse series parameters for optical carrier recording and optical record carrier

An optical record carrier recording method forms pits and lands by directing a radiation beam () onto a recording surface () of an optical record carrier (). The radiation beam for each pit to be recorded is set to at least one write power level (P) capable of forming a pit during a write power irradiation period () and, for each land between the pits, to at least one bottom power level (P) incapable of forming a pit during a bottom power irradiation period (). In order to embed bits of an additional LML channel in the main channel without increasing the overall jitter, the bottom power level (P) is temporarily raised to an LML land power level (P) during an LML land irradiation period () for forming an LML land, the LML land power level (P) being close to the write power level (P), and that the write power level (P) is temporarily lowered to an LML pit power level (P) during an LML pit irradiation period () for forming an LML pit, the LML pit power level (P) being close to the bottom power level (Po).

A circuit arrangement including means for determining a slicer level from incoming signal levels for slicing the incoming signal levels on the basis of the slicer level thus determined, includes a first and a second register circuit, which register circuits are connected to an output of a discriminator circuit. The discriminator circuit compares an incoming signal level with a set discrimination level and is adapted to apply an incoming signal level to the first register circuit if the incoming signal level is higher than the set discrimination level and to apply and incoming signal level to the second register circuit if the incoming signal level is lower than the set termination level. The first and the second register circuit are adapted to determine a register value of a least two different incoming signal levels consecutively applied to the register circuit. The circuit supplies a signal having a level which is a value determine from register values determined by the first and second register circuit. The supplied signal represents both the set discrimination level and the slicer level.

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Eindhoven, Netherlands

Gerardus Rudolph Langereis