JPH0449316U - - Google Patents
Info
- Publication number
- JPH0449316U JPH0449316U JP8836390U JP8836390U JPH0449316U JP H0449316 U JPH0449316 U JP H0449316U JP 8836390 U JP8836390 U JP 8836390U JP 8836390 U JP8836390 U JP 8836390U JP H0449316 U JPH0449316 U JP H0449316U
- Authority
- JP
- Japan
- Prior art keywords
- signal
- differentiating
- edge
- optical recording
- recording medium
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Optical Recording Or Reproduction (AREA)
- Manufacturing Optical Record Carriers (AREA)
Description
第１図は本考案の一実施例の光記録媒体の評価
装置の動作の説明図、第２図は本考案の一実施例
の光記録媒体の評価装置の構成図、第３図は本考
案の実施例の検出信号を生成するロジツク回路の
構成図、第４図は第３図の各部波形を示す波形図
、第５図は従来の評価装置の動作説明図である。
１……光デイスク記録媒体、２……反射信号（
読み出し信号）、３……微分信号、４……２値化
信号、５……２重微分信号、５ａ，５ｂ……スラ
イスレベル、６……２値化信号（５ａによる検出
信号）、７……２値化信号（５ｂによる検出信号
）、８……検出信号。
FIG. 1 is an explanatory diagram of the operation of an optical recording medium evaluation apparatus according to an embodiment of the present invention, FIG. 2 is a configuration diagram of an optical recording medium evaluation apparatus according to an embodiment of the present invention, and FIG. FIG. 4 is a waveform diagram showing the waveforms of each part in FIG. 3, and FIG. 5 is an explanatory diagram of the operation of the conventional evaluation device. 1... Optical disk recording medium, 2... Reflected signal (
readout signal), 3... Differential signal, 4... Binarized signal, 5... Double differential signal, 5a, 5b... Slice level, 6... Binarized signal (detection signal by 5a), 7... ...binarized signal (detection signal by 5b), 8...detection signal.
Claims (1)
録媒体から該信号を読み出す手段と、読み出した
信号を微分する第１の微分手段と、第１の微分手
段で微分した信号を更に微分する第２の微分手段
と、第２の微分手段で微分した信号の、エツジ部
での立ち下り及び立ち上りの傾きを表わす検出信
号を作成する手段とを備えたことを特徴とする光
記録媒体の評価装置。 ２ 前記検出信号を作成する手段は、前記第２の
微分手段で微分した信号を上下の所定スライスレ
ベルでスライスする手段と、両スライスレベル間
に挟まれる前記立ち下り及び立ち上り部分の時間
幅に相当するパルス信号を作成する手段とからな
り、前記パルス信号のパルス幅及びパルス間隔に
より、記録されている信号のエツジの傾き、前エ
ツジから後エツジまでの間隔、及び、後エツジか
ら次のエツジ記録の前エツジまでの間隔を検出す
るように構成したことを特徴とする請求項１記載
の光記録媒体の評価装置。[Claims for Utility Model Registration] 1. A means for reading a signal from an optical recording medium on which the signal is recorded in edge recording format, a first differentiating means for differentiating the read signal, and a method for differentiating the signal by the first differentiating means. The present invention is characterized by comprising a second differentiating means for further differentiating the signal differentiated by the second differentiating means, and a means for creating a detection signal representing the slope of falling and rising at the edge portion of the signal differentiated by the second differentiating means. Evaluation device for optical recording media. 2 The means for creating the detection signal includes means for slicing the signal differentiated by the second differentiating means at predetermined upper and lower slice levels, and a time width corresponding to the falling and rising portions sandwiched between both slice levels. The pulse width and pulse interval of the pulse signal determine the slope of the edge of the recorded signal, the interval from the previous edge to the rear edge, and the recording of the next edge from the rear edge. 2. The optical recording medium evaluation apparatus according to claim 1, wherein the apparatus is configured to detect an interval to a front edge of the optical recording medium.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8836390U JPH0449316U (en) | 1990-08-27 | 1990-08-27 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8836390U JPH0449316U (en) | 1990-08-27 | 1990-08-27 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0449316U true JPH0449316U (en) | 1992-04-27 |
Family
ID=31821543
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8836390U Pending JPH0449316U (en) | 1990-08-27 | 1990-08-27 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0449316U (en) |
-
1990
- 1990-08-27 JP JP8836390U patent/JPH0449316U/ja active Pending
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