JPH0410222A - Optical storing and reproducing device - Google Patents
Optical storing and reproducing deviceInfo
- Publication number
- JPH0410222A JPH0410222A JP10926590A JP10926590A JPH0410222A JP H0410222 A JPH0410222 A JP H0410222A JP 10926590 A JP10926590 A JP 10926590A JP 10926590 A JP10926590 A JP 10926590A JP H0410222 A JPH0410222 A JP H0410222A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- charging
- reproducing
- optical storage
- discharging
- 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
- 230000003287 optical effect Effects 0.000 title claims description 20
- 238000007599 discharging Methods 0.000 claims abstract description 14
- 230000001678 irradiating effect Effects 0.000 claims description 2
- 239000003990 capacitor Substances 0.000 abstract description 5
- 230000001960 triggered effect Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 230000007423 decrease Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000001463 effect on reproduction Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
Landscapes
- Optical Recording Or Reproduction (AREA)
Abstract
Description
【発明の詳細な説明】
技術分野
本発明は光記憶再生装置に関し、特に光デイスク装置の
如く光記憶担体に対してピットを形成して２値ディジタ
ルデータを記憶する光記憶再生装置に関するものである
。TECHNICAL FIELD The present invention relates to an optical storage reproducing device, and more particularly to an optical storage reproducing device that stores binary digital data by forming pits on an optical storage carrier, such as an optical disk device. .
従来技術
従来、この種の光記憶再生装置では、光記憶担体に記録
されたピットに対してレーサスポットを照射して、その
照射光かピットの有無に対応して変化するレーザ光の全
光量を１つ若しくは複数の光検出器゛て検出し、その検
出出力を増幅してパルス化することにより２値データを
得るようになっている。Conventional technology Conventionally, in this type of optical storage reproducing device, a laser spot is irradiated onto pits recorded on an optical storage carrier, and the total light intensity of the laser beam is measured depending on whether the irradiated light is present or not. Binary data is obtained by detecting the light with one or more photodetectors, amplifying the detection output, and pulsing it.
上述した従来の光記憶装置では、レーザ光を集光レーザ
て集光したスポットの大きさは有限径をもっており、そ
の径は光記憶担体上のピットと比較しても決して無視て
きない大きさである。そのため、１本のレーザ光による
反射光若しくは透過光を１つの光検出器によって検出し
ても、ピット密度の高いいわゆるピット間隔の狭い部分
では、照射されたスポットか隣接した２つのピットにか
かる状態か生しることかある。In the conventional optical storage device described above, the size of the spot that is focused by the laser beam has a finite diameter, and that diameter is so large that it cannot be ignored when compared to the pits on the optical storage carrier. be. Therefore, even if reflected light or transmitted light from one laser beam is detected by one photodetector, in areas with high pit density and narrow pit spacing, the irradiated spot may be affected by two adjacent pits. There is something to live for.
すなわち、ある１つのピット情報を再生しているときに
、次にくるピット情報か混入することになる。このため
レーザ光を集光させたスポット径よりも十分大きな間隔
を持つピットの直後にスポット径よりも小さな間隔を持
つピットか存在する場合には、ピットの再生ビームに関
する相互干渉が起き、ピット間隔が上記のように最小で
ある現象が３ビット分以上続いたときにはその開始と終
わりのピットは隣接するピットの方にピーク点がシフト
した様に見える再生信号が得られる。That is, when one pit information is being reproduced, the next pit information will be mixed in. Therefore, if there is a pit with a spacing smaller than the spot diameter immediately after a pit with a spacing sufficiently larger than the spot diameter where the laser beam is focused, mutual interference will occur with respect to the reproduced beam of the pit, and the pit spacing will be reduced. When the above-mentioned phenomenon in which the minimum value continues for three bits or more, a reproduced signal is obtained in which the peak points of the starting and ending pits appear to have shifted toward the adjacent pits.
このように、従来の再生装置による読出し信号は、ピッ
ト間隔の狭い部分ては、ピットの相互干渉によるピーク
シフトや分解能の定価によるＳ／Ｎの低下を生し、再生
エラーマージンを減少させるという欠点かある。As described above, the readout signal from the conventional playback device has the drawback that, in areas where the pit spacing is narrow, a peak shift occurs due to mutual interference between pits, and the S/N ratio decreases due to the list price of resolution, reducing the playback error margin. There is.
発明の目的
本発明の目的は、隣接ピットによる再生信号のピーク点
のシフトを補正して、再生エラーマージン及びＳ／Ｈの
向上を図るようにした光記憶再生装置を提供することで
ある。OBJECTS OF THE INVENTION An object of the present invention is to provide an optical storage/reproduction device that corrects the shift of the peak point of a reproduction signal due to adjacent pits, thereby improving the reproduction error margin and S/H.
発明の構成
本発明によれば、レーザ光を光記憶担体に照射してこの
光記憶担体を経た光を検出することにより、２値ディジ
タルデータを読出す光記憶再生装置であって、充電時定
数か放電時定数よりも充分大なる充放電手段と、前記光
記憶担体からの光による再生信号と前記充放電手段によ
る充放電電圧とをレベル比較する比較手段と、この比較
出力に応答して所定幅のパルスを発生する手段と、前記
パルスの存在期間前記充放電手段を放電制御し、残余の
期間充電制御する制御手段と、前記充放電電圧と前記再
生信号とを加算する加算手段と、この加算出力から直流
成分を除去するフィルタ手段とを含むことを特徴とする
光記憶再生装置か得られる。Structure of the Invention According to the present invention, there is provided an optical storage reproducing device that reads out binary digital data by irradiating an optical storage carrier with a laser beam and detecting the light that has passed through the optical storage carrier. a charging/discharging means which is sufficiently larger than the discharge time constant; a comparing means for comparing the level of the playback signal by light from the optical storage carrier and the charging/discharging voltage by the charging/discharging means; means for generating a pulse of a certain width; control means for controlling discharging of the charging/discharging means during the existence period of the pulse, and controlling charging for the remaining period; addition means for adding the charging/discharging voltage and the reproduction signal; There is obtained an optical storage reproducing device characterized in that it includes a filter means for removing a DC component from the addition output.
実施例 次に、本発明の実施例を図面を参照して説明する。Example Next, embodiments of the present invention will be described with reference to the drawings.
第１図は本発明の実施例の回路ブロック図である。オフ
セント電圧源１は再生手段２による再生信号２０１のビ
ークンフト補正用のオフセット電圧１０１を発生するも
のであり、充放電制御用スイッチ１１と、充電時定数を
定める抵抗］２と、電荷の充放電かなされるコンデンサ
１３と、放電時定数を定める抵抗１４と、電圧源１５と
を含む。FIG. 1 is a circuit block diagram of an embodiment of the present invention. The offset voltage source 1 generates an offset voltage 101 for beaknft correction of the reproduction signal 201 by the reproduction means 2, and includes a charge/discharge control switch 11, a resistor 2 that determines the charging time constant, and a charge/discharge control switch 11. 13, a resistor 14 that determines a discharge time constant, and a voltage source 15.
再生手段２は光検出器（図示せず）からの出力を再生信
号２０１に変換して出力し、加算器３及びレベルコンパ
レータ５の各１人力とする。この加算器３は再生信号２
０１とコンデンサ１３によるオフセット電圧ｌｏｔとを
加算し、ＨＰＦ（／Ｘイパスフィルタ）４はこの加算出
力３０１から直流成分を除去した再生出力４０１を得る
ものである。The reproducing means 2 converts the output from a photodetector (not shown) into a reproduced signal 201 and outputs it, so that the adder 3 and the level comparator 5 are each operated by one person. This adder 3 outputs the reproduced signal 2
01 and the offset voltage lot generated by the capacitor 13, the HPF (/X pass filter) 4 obtains a reproduced output 401 by removing the DC component from this addition output 301.
レベルコンパレータ５は再生信号２０１とオフセット電
圧１０１とのレベル比較を行い、この比較結果５０１は
リトリガ機能のＭ／Ｍ （モノステーブルマルチバイブ
レータ）６のトリが入力となっている。このＭ ／ Ｍ
６の単発パルスが充放電制御用スイッチ１１をオンオ
フ制御する。The level comparator 5 compares the levels of the reproduced signal 201 and the offset voltage 101, and this comparison result 501 is input to the trigger of an M/M (monostable multivibrator) 6 with a retrigger function. This M/M
The single pulse 6 controls the charge/discharge control switch 11 to be turned on or off.
第２図は第１図のブロックの動作を示すタイミンクチャ
ートであり、光記憶担体上のビット位置か最上列２１０
に示す様な場合について示している。FIG. 2 is a timing chart showing the operation of the block of FIG.
This example shows the case shown in .
二のときの再生信号２０１は図に示す如き波形となり、
ビット位置２１０と再生信号２０１ とは市確に対応せ
ず、図の如くピット間隔か狭いピーク位置のうち、先行
するピーク位置Ａ及びＣかビット位置２１１及び２１．
３よりもτ１及びτまたけ右シフトした様になる。The reproduced signal 201 at the time of 2 has a waveform as shown in the figure,
The bit position 210 and the reproduced signal 201 do not correspond exactly, and as shown in the figure, among the peak positions with narrow pit intervals, the preceding peak positions A and C are the bit positions 211 and 21.
3, it appears to have been shifted to the right across τ1 and τ.
この先行するピットに対応する再生信号のピーク位置Ａ
及びＣのすれτ１．τ２か再生エラーを招くことか知ら
れており、そこで、このピーク位置Ａ及びＣの右シフト
をオフセット電圧により補正しようとするものである。Peak position A of the reproduced signal corresponding to this preceding pit
and C slip τ1. It is known that .tau.2 causes a reproduction error, and therefore, an attempt is made to correct this rightward shift of the peak positions A and C using an offset voltage.
この場合、再生信号間隔かある値（τ７）以上に広かっ
た直後にビット間隔か狭くなった再生信号かエラーとな
る危険が大であることから、この様な場合について補正
を行う。In this case, there is a high risk that an error will occur if the bit interval becomes narrower immediately after the reproduced signal interval has been wider than a certain value (τ7), so correction is made for such a case.
まず、再生信号２０１のレベルとオフセント電圧１０１
のレベルとかコンパレータ５にて比較されると、比較信
号５０１か得られる。この比較信号５０１かハイレベル
のときには、再生信号２０１のレベルかオフセット電圧
レベルよりも大きくピット位置に対応しているので、こ
の信号５０１の立上りタイミンつてＭ／Ｍ６をトリ力し
、パルス幅τ３のスイッチ制御信号６０１を発生させる
。First, the level of the reproduced signal 201 and the offset voltage 101
A comparison signal 501 is obtained when the level of the signal is compared by the comparator 5. When this comparison signal 501 is at a high level, it corresponds to a pit position that is greater than the level of the reproduced signal 201 or the offset voltage level, so the M/M6 is tri-inputted at the rising timing of this signal 501, and the pulse width τ3 is A switch control signal 601 is generated.
この信号６０１の存在期間τ３スイッチ１１をオフとし
、コンデンサ１３の充電電荷を放電時定数τ５ （〈τ
３）にて放電させ、残余の期間は充電時定数τ６ （〈
τ７）にて充電するようにしている。この充放電波形１
０１の詳細か第３図に示されており、各時定数及び時間
の関係が明確化されている。The period of existence of this signal 601 τ3 The switch 11 is turned off, and the charge in the capacitor 13 is discharged with a time constant τ5 (<τ
3) and charge time constant τ6 (〈
The battery is charged at τ7). This charge/discharge waveform 1
01 is shown in detail in FIG. 3, and the relationship between each time constant and time is clarified.
この波形１０１から判る様に、期間１７以上の間隔て再
生ピーク信号か到来したときに、コンデンサ１３の充電
電荷を速やかに完全に放電させ、再生ピーク位置Ａ及び
Ｃの直前に孤立ピット（前後のピットからの干渉を受け
ない位置に単独で存在するピット）に相当する信号のエ
ンベロープ（１０１）を発生させている。As can be seen from this waveform 101, when the reproduction peak signal arrives at an interval of 17 or more periods, the charge in the capacitor 13 is quickly and completely discharged, and immediately before and after the reproduction peak positions A and C there are isolated pits. A signal envelope (101) corresponding to a pit that exists alone at a position that is not subject to interference from the pit is generated.
このエンベロープ（１，０１）を加算器３にてｉｌＥ信
号２０１ と加算し、この加算出力３０１から直流成分
を除くと、図の４０１の波形となり、再生信号のピーク
位置Ａ及びＣはτ４たけ左シフト（進み）されることに
なる。このとき、オフセット電圧１０１を調整すれは、
τ２とτ４とを等しくすることかてき、補正可能となる
。When this envelope (1,01) is added to the ilE signal 201 in the adder 3 and the DC component is removed from this addition output 301, the waveform 401 in the figure is obtained, and the peak positions A and C of the reproduced signal are τ4 to the left. It will be shifted (advanced). At this time, adjusting the offset voltage 101 is as follows:
Correction is possible by making τ2 and τ4 equal.
尚、第２図の波形で再生信号のピーク位置Ｅの波形も、
オフセット電圧によりピーク位置Ａ及びＣと同様にτ４
たけ左シフトされるが、このピーク位置は隣接ピット間
隔がピーク位置ＡＣに比し大であるので、隣接ピットか
ら影響を受けないために、再生に影響はない。In addition, the waveform of the peak position E of the reproduced signal in the waveform of Fig. 2 is also as follows.
Similar to peak positions A and C due to offset voltage, τ4
However, since the interval between adjacent pits at this peak position is larger than that at the peak position AC, this peak position is not affected by the adjacent pits, and thus has no effect on reproduction.
発明の効果
以上述べた様に、本発明によれば、光学的に発生する再
生信号のピークシフトを、電気的にオフセット電圧を与
えてピークシフトを起すピットの直前に仮想的にピット
を設定し、この仮想ピットによる前方からの干渉と真に
悪影響を与える後続ピットからの干渉とをキャンセルさ
せ、理想に近い再生信号を得ることができるので、読出
しエラマージン及びＳ／Ｈの向上を図ることか可能とな
るという効果かある。Effects of the Invention As described above, according to the present invention, a peak shift of an optically generated reproduced signal can be applied by electrically applying an offset voltage to virtually set a pit just before the pit that causes the peak shift. , it is possible to cancel the interference from the front due to this virtual pit and the interference from the subsequent pits that have a real negative effect, and obtain a reproduction signal close to the ideal, thereby improving the read error margin and S/H. This has the effect of making it possible.
第１図は本発明の実施例のブロック図、第２図は、第１
図のブロックの動作を示す信号波形図、第３図はオフセ
ット電圧１０１の詳細波形図である。
主要部分の符号の説明
１ ・・オフセット電圧源
２・・・・・・再生手段
３・・・・・・加算器
４・・・・・・ＨＰＦ
５・・・・・レベルコンパレータ
６・・・・・Ｍ／Ｍ
１１・・・・・スイッチ
］２１４・・・・・・抵抗
］３・・・・・コンデンサ
１５・・・・・・電圧源
第１図FIG. 1 is a block diagram of an embodiment of the present invention, and FIG. 2 is a block diagram of an embodiment of the present invention.
A signal waveform diagram showing the operation of the blocks in the figure, and FIG. 3 is a detailed waveform diagram of the offset voltage 101. Explanation of symbols of main parts 1 ... Offset voltage source 2 ... Regeneration means 3 ... Adder 4 ... HPF 5 ... Level comparator 6 ... ...M/M 11...Switch] 214...Resistor] 3...Capacitor 15...Voltage source Figure 1
Claims (1)
を経た光を検出することにより、２値ディジタルデータ
を読出す光記憶再生装置であって、充電時定数が放電時
定数よりも充分大なる充放電手段と、前記光記憶担体か
らの光による再生信号と前記充放電手段による充放電電
圧とをレベル比較する比較手段と、この比較出力に応答
して所定幅のパルスを発生する手段と、前記パルスの存
在期間前記充放電手段を放電制御し、残余の期間充電制
御する制御手段と、前記充放電電圧と前記再生信号とを
加算する加算手段と、この加算出力から直流成分を除去
するフィルタ手段とを含むことを特徴とする光記憶再生
装置。(1) An optical storage reproducing device that reads binary digital data by irradiating an optical storage carrier with laser light and detecting the light that passes through the optical storage carrier, in which the charging time constant is longer than the discharging time constant. a sufficiently large charging/discharging means; a comparing means for level-comparing the reproduction signal by light from the optical storage carrier and the charging/discharging voltage by the charging/discharging means; and generating a pulse of a predetermined width in response to the comparison output. means for controlling discharging of the charging and discharging means during the existence period of the pulse and controlling charging for the remaining period; addition means for adding the charging and discharging voltage and the reproduction signal; and a DC component from the addition output. 1. An optical storage reproducing device comprising: a filter means for removing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10926590A JPH0410222A (en) | 1990-04-25 | 1990-04-25 | Optical storing and reproducing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10926590A JPH0410222A (en) | 1990-04-25 | 1990-04-25 | Optical storing and reproducing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0410222A true JPH0410222A (en) | 1992-01-14 |
Family
ID=14505787
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10926590A Pending JPH0410222A (en) | 1990-04-25 | 1990-04-25 | Optical storing and reproducing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0410222A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11029023B2 (en) | 2014-04-22 | 2021-06-08 | Universal City Studios Llc | System and method for generating flame effect |
-
1990
- 1990-04-25 JP JP10926590A patent/JPH0410222A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11029023B2 (en) | 2014-04-22 | 2021-06-08 | Universal City Studios Llc | System and method for generating flame effect |
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