Appliance for recording or playing back information having means for detecting or moving the scanning location

Abstract

The invention proposes an appliance for recording or playing back information having means for detecting or moving the position of a scanning device over a disc with a wobble track, said appliance being able to be used both in recorded and in unrecorded areas of the disc and hence being able to be used both for write-once and for rewriteable recording media with a wobble track, and said appliance additionally permitting fast determination of the scanning location without decoding of scanned-location information which is contained in the wobble track. According to the invention, a wobble signal is scanned from the wobble track on the disc using a scanning device, and a wobble frequency contained in the wobble signal detected from the disc is used for detecting or moving the position of the scanning device. In this regard, the wobble frequency is related to the number of revolutions or the rotation speed of the disc or to a wobble frequency known for a reference location on the disc, which allows the position of the scanning device to be detected or moved without decoding of scanning-location information which is contained in the wobble signal. To generate the wobble frequency contained in the wobble signal, a circuit block is provided which contains a phase comparator, a bandpass filter, a voltage-controlled multivibrator and a digital phase shifter and is used to generate a wobble-frequency signal.

Description

technical field [0001] The invention relates to a device for recording or reproducing information having means for detecting or shifting the scanning position on a disc with wobbled tracks. The device has means for detecting and moving the scanning position of the scanning device on recorded and unrecorded areas of the disc, and is therefore suitable for rewritable and write-once recording media with wobbled tracks, and also also Allows detection of the current scan position during track jumps. Background technique [0002] Recording or playback of information that is stored or needs to be stored on a recording medium requires detection of a scanning position and movement of a scanning device for scanning the recording medium. Scanning devices used for recording or reproducing information are also often referred to as pickups. Various methods are known for position determination or localization of scanning devices. Information about the scanning position is stored on the ...

AI Technical Summary

Problems solved by technology

The accuracy and speed of this method is also insufficient for the requirements of a DVD drive

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