Abstract: The present invention relates to a holographic recording medium adapted to store additional information for the recorded holograms, and to a holographic pickup for a holographic storage system for use with the holographic recording medium. According to the invention, the holographic recording medium has a holographic layer for storing holograms and a servo layer for positioning a light beam for reading and/or recording of a hologram relative to the holographic recording medium, wherein the servo layer is recordable or rewritable. A holographic pickup for use with such a holographic recording medium includes a light source for recording additional data in the servo layer of the holographic recording medium.

Abstract: The present invention relates to a scanner for optical storage media with an improved signal-to-noise ratio. In the case of an optical scanner according to the invention having a light source for generating a light beam for reading out data stored on an optical storage medium, the light source being modulated by a radio-frequency modulator, and having an analog-to-digital converter, which converts an analog data signal generated by a photodetector into a digital data signal), the radio-frequency modulator and the analog-to-digital converter are synchronized.

Abstract: The present invention relates to a method for recording data pages in a holographic recording medium, and more specifically to a method for compensating for sensitivity variations of the holographic material of the holographic recording medium. According to the invention, a method for recording data pages on a holographic recording medium has the steps of: modulating a light beam with a spatial light modulator to generate a data page with data to be recorded, and applying a compensation profile to the data pages during recording for reducing contrast variations in the reconstructed data pages, wherein the compensation profile is determined from the irradiation history at the recording position and the sensitivity curve of the material of the holographic recording medium.

Abstract: The present invention relates to a holographic recording medium, adapted to store additional information for the recorded holograms, and to a holographic pickup for a holographic storage system for use with the holographic recording medium. According to the invention, the holographic recording medium has a holographic layer for storing holograms and a servo layer for positioning a light beam for reading and/or recording of a hologram relative to the holographic recording medium, wherein the servo layer is recordable or rewritable. A holographic pickup for use with such a holographic recording medium includes a light source for recording additional data in the servo layer of the holographic recording medium.

Abstract: The present invention relates to a scanner for optical storage media with an improved signal-to-noise ratio. In the case of an optical scanner according to the invention having a light source for generating a light beam for reading out data stored on an optical storage medium, the light source being modulated by a radio-frequency modulator, and having an analog-to-digital converter, which converts an analog data signal generated by a photodetector into a digital data signal, the radio-frequency modulator and the analog-to-digital converter are synchronized.

Abstract: Intensity profile correction for data pages for holographic storage The present invention relates to a method for recording data pages in a holographic recording medium, and more specifically to a method for compensating for sensitivity variations of the holographic material of the holographic recording medium. According to the invention, a method for recording data pages on a holographic recording medium has the steps of: modulating a light beam with a spatial light modulator to generate a data page with data to be recorded, and applying a compensation profile to the data pages during recording for reducing contrast variations in the reconstructed data pages, wherein the compensation profile is determined from the irradiation history at the recording position and the sensitivity curve of the material of the holographic recording medium.

Abstract: Method for recording on an optical recording medium The invention relates to a method for recording on an optical recording medium, to an optical recording medium suitable for this method, and to a device for writing to optical recording media using such method or optical recording medium. According to the invention the recording process is split into two tasks: Pre-writing an optical recording medium, e.g. in a stationary device, and recording on the optical recording medium with a low-power write strategy, e.g. in a mobile device.

Abstract: In order to compensate for so-called clipping effects, it is proposed, in an apparatus for reading from and/or writing to an optical recording medium in which the light power of a laser diode (1) is to be set to a plurality of light power levels,to perform a calibration to a specific light power level (LP2) before the actual regulation of the light power. On account of the calibration, the instantaneous gradient of the characteristic curve which describes the dependence of the laser light power on the laser diode current can be inferred in order, on the basis of this information, to take account f a change—caused, for example, by ageing r clipping effects—in the characteristic curve gradient in the course of the subsequent regulation of the light power of the scanning beam generated by the laser diode (1).

Abstract: It is known in the case of digital helical track recording and replay apparatuses for audio, video and general data to be recorded for pilot tones to be interleaved in the data tracks, for tracking. The interleaving can be carried out simultaneously with the data by frequency decoupling (a) or by superimposition (b). The invention is based on the object of providing a helical track recording and replay system which carries out tracking in a simple manner. According to the invention, the ATF signal is obtained in a filter module, which also carries out the rectification of the filtered-out pilot tones. The two DC voltage levels are interrogated and processed in the servo microcontroller, with A/D converters. Coupled to the rotation of the head drum, pulses are produced by the servo system which switch the ATF conditioning over between direct operation and tracking operation, so that evaluation is achieved by the microcontroller during the fast ATF burst phase.