摘要:
The invention relates to a method for evaluating a wobble signal (TW). Also described is a circuit for performing such method and an apparatus for reading from and/or writing to optical recording media using such method or circuit. According to the invention the method includes the steps of: - determining (22) the sign (SI) of the wobble signal (TW), the sign (SI) indicating whether a wobble period of the wobble signal (TW) is inverted or non-inverted, - generating (23) a filtered signal (FS) by a weighted averaging of the sign (SI) over two or more wobble periods; and - integrating (24) the filtered signal (FS).
摘要:
The present invention relates to a method for detecting a wobble signal WS. It is an object of the invention to propose a method for detecting a wobble signal WS within a single wobble period, without the need of additional filtering. The method comprises the steps of:
comparing an input signal IS comprising the wobble signal WS with a reference signal RS, the reference signal RS corresponding in phase and frequency to the desired wobble signal WS; and outputting an output signal OS indicating the amplitude and phase of the wobble signal WS.
摘要:
The present invention relates to a holographic storage medium (10), and more specifically to a holographic storage medium (10) with an improved servo architecture for precise positioning of a laser beam in radial, axial and tangential direction. According to the invention, a holographic storage medium (10) includes a holographic layer (42) for storing holograms and a servo layer (44) with a track structure (40) for positioning a light beam (7, 8) for reading and/or recording of a hologram relative to the holographic recording medium (10), wherein the track structure (40) includes a pack of two or more tracks (48, 49).
摘要:
Die Erfindung betrifft ein Verfahren zur Erfassung von Daten mit einem Bildsensor, bei dem ein optisches Speichermedium, das binäre Informationen in Form von zumindest einer zweidimensionalen Datenseite erhält, mit einem Laserstrahlenbündel belichtet und die belichtete Datenseite mit einem Bildsensor ausgelesen wird, wozu dieser über eine aktivierbare, eine Vielzahl von Pixeln aufweisende Fläche verfügt. Sie löst die Aufgabe, ein derartiges Verfahren so zu gestalten, dass das Auslesen der Informationen bei gleich bleibender Pixelzahl beschleunigt wird. Dazu ist die aktivierbare Fläche (3) des Bildsensors (2) in verschiedene Bereiche (2.1, 2.2) unterteilt, die jeweils einem Bereich mit einer bestimmten Intensität des Lichtstrahls zugeordnet sind. Für Bereiche (2.2), die Bereichen mit geringerer Intensität zugeordnet sind, ist dabei eine längere Belichtungszeit und/oder eine höhere Empfindlichkeit bestimmt als für Bereiche (2.1), die Bereichen mit einer höheren Intensität zugeordnet sind.
摘要:
The present invention relates to a holographic recording medium (9) adapted to store additional information for the recorded holograms, and to a holographic pickup (1) for a holographic storage system for use with the holographic recording medium (9). According to the invention, the holographic recording medium (9) has a holographic layer (94) for storing holograms and a servo layer (92) for positioning a light beam for reading and/or recording of a hologram relative to the holographic recording medium, wherein additional data can be recorded in the servo layer (92). A holographic pickup (1) for use with such a holographic recording medium (9) includes a detector (20) for retrieving the additional data recorded in the servo layer (92).
摘要:
The invention relates to a method for storing data in a prerecorded area of an optical recording medium, and to an optical recording medium having at least one prerecorded area in which data is stored according to the method. It is an object to propose a method for storing data in a prerecorded area of an optical recording medium using pits 6 and lands 7, whereby the signal obtained from the pits 6 and lands 7 is compatible with a high frequency modulated groove signal. According to the invention, the pits 6 and lands 7 adjacent to bit cell signal transitions 1, 2, 3, 4 are arranged in a predefined manner, either in a fixed recurring sequence of pits 6 and lands 7 or symmetrically to the bit cell signal transitions 1, 2, 3, 4.