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Zero crossing level matching apparatus and method

A level matching and zero-crossing technology, applied in the direction of optical recording/reproduction, data recording, digital recording/reproduction, etc., can solve the problem of complex hardware of the channel bit stream detector

Inactive Publication Date: 2004-01-21
IONOSEP X HLDG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, the hardware of the channel bitstream detector becomes complex
In addition, in the case of digital equalization, the A-D converter has a large response voltage width

Method used

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  • Zero crossing level matching apparatus and method
  • Zero crossing level matching apparatus and method
  • Zero crossing level matching apparatus and method

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Embodiment Construction

[0017] refer to Figure 5 , shows a zero-crossing level matching device according to an embodiment of the present invention. A zero-crossing level matching device is used instead of the channel bit stream detector shown in FIG. 3 in the information playback apparatus to detect the channel bit stream from the radio frequency signal RF picked up from the recording medium of FIG. 1 or FIG. 2 . A radio frequency signal includes two components with mutually different zero-crossing levels. To this end, the zero-crossing level matching means includes a first operational amplifier A1 for receiving a radio frequency signal RF from an input line 31 at its non-inverting terminal (+). When playing back the recording medium in Figure 1 or Figure 2, such as Figure 6 As shown, the radio frequency signal RF includes an ID component APC having a zero-crossing level corresponding to the first voltage level FVL, and a user information component UIC having a zero-crossing level corresponding to...

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Abstract

A zero crossing level matching apparatus for effectively processing a reproducing signal including two or more components having different zero crossing levels. In the apparatus, a reproducing signal picked up from a recording medium having signal tracks divided into user information fields and identification fields and including first and second signal components having different zero crossing levels in correspondence with the fields is compared with a reference signal by a comparator to detect a data stream. The data stream generated at the comparator is integrated by first and second integrators to detect the zero crossing levels of the first and second signal components. The output signals of the first and second integrators are selectively applied as the reference signal in accordance with whether any one of the first and second signal components is included in the reproducing signal.

Description

technical field [0001] The present invention relates to an apparatus and method for matching the zero-crossing level of a signal reproduced by an information reproducing device, and in particular to an apparatus and a method suitable for processing the zero-crossing of a reproduced signal comprising two or more components having different zero-crossing levels Level matching device and method. Background technique [0002] Recently, various types of recording media have been developed and popularized in order to record as much information as possible. Examples of these recording media include optical discs such as compact discs (CDs) having relatively large signal track widths and pitches between signal tracks and digital versatile discs (DVDs) having relatively small signal track widths and signal track pitches. In optical discs, signal track width and signal track pitch have been reduced in order to record as much information as possible. In addition, in order to reproduc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G11B7/00G11B7/005G11B7/007G11B20/10
CPCG11B7/00745G11B7/00718G11B20/10203G11B7/005G11B20/10
Inventor 金大泳
Owner IONOSEP X HLDG