U.S. Philips Corporation

Hindrik Veldhuis

Rudolf Roth

Jacobus P Heemskerk

Johannes H Spruit

Johannes Leopoldus Bakx

A method and device for recording signals on a record carrier with the aid of a radiation beam (15). The signals are recorded in the form of optically detectable marks in parallel tracks which have a substantially constant track pitch. The recording intensity of the radiation beam is set in such a way that with a 'minimum' recording intensity information patterns are recorded with a low desired error rate '(Block) Error Rate'. Furthermore, a method and device are described by which the 'minimum' recording intensity of the radiation beam can be determined.

Methods and devices for recording one or more signals which have been

Methods of and information recording devices for recording and/or inhibiting recording of a signal including copy bits on a record carrier, and a record carrier including that signal. The signal has successive information frames including main data and subcode data. The subcode data of the information frames make up successive subcode frames having copy bits with logic values which alternate among the subcode frames in accordance with a predetermined pattern. Each subcode frame has at least one copy bit. In one of the embodiments, the signal is received and a determination is made whether to inhibit its recording on the basis of the predetermined pattern exhibited by the logic values of the copy bits contained in the subcode frames. In another embodiment the subcode frames are replaced by substitute subcode frames having copy bits with logic values which alternate among the substitute subcode frames in accordance with a selected pattern prior to recording of the signal. The predetermined and selected patterns are indicative of a particular characteristic of the main data (e.g., whether the main data is copy protected).

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Eindhoven, Netherlands

Hindrik Veldhuis