Koninklijke Philips Corporation N.v.

Paulus Reinier Joannes Van Roosmalen

Job Cornelis Oostveen

Willem Marie Julia Marcel Coene

Aloysius Michael Josephus Maria Spruijt

Jan Harm De Boer

Franciscus Lucas Antonius Johannes Kamperman

Franciscus Antonius Johannes Kamperman

Jan Harm Boer

An information system according to the invention comprises a record carrier and a playback apparatus. The record carrier has information marks along a track thereof and exhibits first variations caused by existence and nonexistence of the information marks along the track. The first variations represent an information signal recorded on said record carrier. The record carrier further exhibits second variations caused by variations associated with the information marks. The phase of the second variations is coupled to the phase of the first variations.

Record carrier, playback apparatus and information system comprising a record carrier and a playback apparatus

The invention relates to a method for generating a primary binary signal having a predetermined spectral shape in a predetermined frequency range, in particular having a notch in the power spectrum in a predetermined frequency range. In order to avoid crosstalk between a primary binary signal and a secondary binary signal it is proposed according to the invention that data-words are modulated into channel-words forming the channel bitstream of the primary binary signal and that the modulation of the data-words is chosen such that the predetermined spectral shape of the channel bitstream of the primary binary signal is achieved by using an evaluation criterion based on a spectral weight function the shape of which is tailored to the spectral extent of the channel bitstream of a secondary binary signal. The invention is in particular useful for generating a primary binary signal which is used in the lead-in area of an optical record carrier where a wobble is used in the secondary binary signal for storing a wobble key. The invention relates further to a device for generating the channel bitstream of a primary binary signal, to a primary binary signal and to a record carrier for storing such a binary signal.

Method for generating a binary signal having a predetermined spectral shape

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Eindhoven, Netherlands

Paulus Reinier Joannes Van Roosmalen