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Optical disk recording/playback apparatus and optical disk evaluation method

一种再生装置、光盘记录的技术，应用在记录/再现/删除方法、盘状记录载体、数字记录/再现等方向，能够解决不能正确进行跳动评价等问题，达到消除遗漏、正确评价跳动的效果

Inactive Publication Date: 2005-09-14
SANYO ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the measurement data of the count value N4 is not written into the buffer RAM7, and there is a problem that the jitter evaluation cannot be performed correctly.

Method used

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  • Optical disk recording/playback apparatus and optical disk evaluation method
  • Optical disk recording/playback apparatus and optical disk evaluation method
  • Optical disk recording/playback apparatus and optical disk evaluation method

Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach ＝

[0042] ===First Embodiment===

[0043]

[0044] A CD recording and reproducing device 200 as an optical disc recording and / or reproducing device (hereinafter referred to as an optical disc recording and reproducing device) according to the first embodiment of the present invention has the configuration shown in FIG. 1 . In this embodiment, circuits that realize the same functions as those in the prior art shown in FIG. 20 are denoted by the same reference numerals, and their descriptions are omitted.

[0045] In the CD recording / reproducing apparatus 200 , the counter 11 is connected to the binary circuit 4 to acquire the EFM signal output from the binary circuit 4 . In addition, the counter 11 counts each clock period of the EFM signal with a counter clock having a higher frequency than the input EFM signal, and transfers the count value to the FIFO 12 which is a temporary storage circuit for temporarily storing each count value. The FIFO 12 is composed of registers and th...

no. 2 approach ＝

[0075] === Second Embodiment ===

[0076]

[0077] Groove wobble and LPP as a preformat method of DVD-R / RW media will be described with reference to FIG. 10 .

[0078] The DVD-R / RW medium is set with: groove tracks (recording grooves) formed in a spiral shape as tracks for recording data; and land tracks in which LPPs are formed in advance between adjacent groove tracks. In addition, the groove track is pre-zigged with a certain period. The zigzag frequency (wobble frequency) is about 140.6 KHz at the standard speed of DVD-R / RW. By multiplying the wobble frequency by 186 times, a clock signal corresponding to the mark unit length can be obtained. That is, when the DVD-R / RW standard speed "1 / 26.16 MHz" is represented by "1T", the period of one wobble frequency component is "186T".

[0079] The data recorded in the groove track has a plurality of ECC (Error Correcting Code) blocks as an error correction unit. One ECC block is composed of 16 sectors (sector 0 to sector 15), ...

example

[0118] In this way, according to the second embodiment of the present invention, due to the address information obtained from the pre-format information of the optical disc, each clock period of the EFM / EFMPlus signal corresponding to the desired partition area on the optical disc can be specified for jitter evaluation. , therefore, the reliability of the jitter evaluation can be improved. Also, according to the second embodiment of the present invention, the clock period specification for jitter evaluation and the counting operation of the counter 312 can be synchronized based on the address information and synchronization code acquired from the preformat information of the optical disc. In addition, this synchronization process is performed independently of the control microcomputer 308 which performs asynchronous control (push / inquiry) on the LPP / ADIP decoder 305, the counter control circuit 314, and the like. That is, according to the second embodiment of the present inven...

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Abstract

A counter 11 continuously reads in the EFM signal from a binarizing circuit 4 , resets its count value each time the polarity of the EFM signal changes, counts counter clocks higher in frequency than the EFM signal during each EFM period of the EFM signal, and transfers the count values to a FIFO 12 sequentially. The FIFO 12 temporarily stores the count values transferred, and writes a predetermined number of count values into a buffer RAM in a batch each time the predetermined number of count values are stored.

Description

technical field [0001] The present invention relates to irradiating laser light to an optical disc, receiving the laser light changed due to information pits or marks recorded on the optical disc, and converting the light quantity of the received laser light into an electrical signal to obtain a reproduced signal, so as to carry out the An optical disc recording and reproducing apparatus and an optical disc evaluation method for evaluating an optical disc are described. Background technique [0002] Conventionally, an evaluation device called a jitter meter has been used as an evaluation device for an optical disc (see, for example, Patent Document 1 below). Such an evaluation device is a device for quantitatively measuring the state of smearing in an optical disc reproduction signal called jitter. However, a dedicated runout measuring instrument is expensive and cannot be easily evaluated. Therefore, a method of evaluating jitter using an optical disc playback device is b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B20/10G11B5/09G11B7/00G11B7/005G11B20/18
CPCG11B20/10398G11B2220/2537G11B20/1024G11B20/10222G11B2020/1461G11B20/10009G11B20/10407G11B20/1816
Inventor 妹尾秀满神谷知庆塚水雄一朗
Owner SANYO ELECTRIC CO LTD
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