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Automatic detecting device for preetched bumper signal

A detection device and a technology for bump rails, which are applied in the field of automatic detection devices, can solve the problems of difficulty in correctly pre-engraving bump rail cutting signals and the like.

Inactive Publication Date: 2007-06-13
IND TECH RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has already included the influence factors of the written data on the wobble signal, thus greatly reducing the cutting of wrong digital pre-engraved bump signals, thereby improving the conventional technology of using fixed pre-engraved bump cutting level technology, which is not easy Absence of correct pre-groove cut signal in recorded data discs

Method used

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  • Automatic detecting device for preetched bumper signal
  • Automatic detecting device for preetched bumper signal
  • Automatic detecting device for preetched bumper signal

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Embodiment Construction

[0048] Figure 5 is a schematic diagram of the data track format of a recordable digital laser video disc, which shows the relationship between the wobble signal (wobble signal) and the pre-engraved land track (LPP), and the pre-engraved track on the actual blank recordable digital laser video disc The bump area 55 is engraved on the crest of the wobble in the groove area 57, and the groove area (groove) 51 and the land 57 are alternately arranged on the data track of the optical disc. In order to take out the pre-engraved bump signal from the groove area 57, a push-pull (push-pull) method is used to extract the signal, and the gain of the push-pull signal is adjusted in an appropriate ratio to enhance the pre-engraved bump to the groove. The signal-to-noise ratio of the wobble signal of the groove area 51.

[0049] In order to improve the accuracy of digital pre-engraved bump signal data, the present invention proposes two implementation methods. Please refer to Fig. 6 for th...

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Abstract

Using well-known technique for adjusting push-pull signal gain, the invention raises Signal to Noise Ratio (SNR) of wobble signal in detecting convex tracks made in advance. Besides the invention uses digital logic to determine real position from signals of tracks, the automatic slice level unit combines RC circuit of automatic detecting level and fixing slice level unit to determine prepared tracks made in advance as reference in order to improve technique of using fixing type slice level for positioning tracks. The invention does not lose signal and obtains corrective signals of tracks.

Description

technical field [0001] The present invention is an automatic detection device for the pre-engraved convex track signal of a digital laser video disc, which utilizes the adjustment of the "push-pull" signal gain to improve the signal-to-noise ratio of the pre-engraved convex track signal to the wobble signal, and Use digital logic to distinguish the actual position of the pre-engraved convex track signal, and use the automatic cutting level formed by the combination of the automatic level detection of the RC circuit and the fixed cutting level, as the basis for judging the pre-engraved convex track. Background technique [0002] The recordable digital laser video disc (write-onceDVD, DVD-R) or rewritable digital laser video disc (re-writable DVD, DVD-RW) of the digital laser video disc (DVD) in the prior art has the same structure, wherein The location of the pre-engraved bump (LPP) on the track of the disc contains information such as the wavelength of the laser (laser) for ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G11B7/004G11B7/00
Inventor 罗丰祥李永龙辛国鼎黄金寿巫信辉吴志中王信博
Owner IND TECH RES INST