JPH0648582B2 - Optical information recording / reproducing method - Google Patents
Optical information recording / reproducing methodInfo
- Publication number
- JPH0648582B2 JPH0648582B2 JP57051229A JP5122982A JPH0648582B2 JP H0648582 B2 JPH0648582 B2 JP H0648582B2 JP 57051229 A JP57051229 A JP 57051229A JP 5122982 A JP5122982 A JP 5122982A JP H0648582 B2 JPH0648582 B2 JP H0648582B2
- Authority
- JP
- Japan
- Prior art keywords
- synchronization
- pattern
- information recording
- signal
- synchronization pattern
- 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.)
- Expired - Lifetime
Links
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/10—Digital recording or reproducing
- G11B20/18—Error detection or correction; Testing, e.g. of drop-outs
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/10—Digital recording or reproducing
- G11B20/14—Digital recording or reproducing using self-clocking codes
- G11B20/1403—Digital recording or reproducing using self-clocking codes characterised by the use of two levels
- G11B2020/1476—Synchronisation patterns; Coping with defects thereof
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Signal Processing For Digital Recording And Reproducing (AREA)
- Optical Recording Or Reproduction (AREA)
Description
【発明の詳細な説明】 本発明は、光ディスクなどのディスク媒体にデータを記
録し再生するディスクシステムに係り、特に高信頼の検
出を可能とする同期情報をデータに付加してディスク媒
体に記録し、データ再生の信頼性を向上させたデータの
記録再生方方法、その方法に使用するディスク媒体及び
データ記録再生装置に関する。The present invention relates to a disk system for recording and reproducing data on a disk medium such as an optical disk, and in particular, adds sync information to the data to enable highly reliable detection and records the data on the disk medium. The present invention relates to a data recording / reproducing method with improved reliability of data reproduction, a disk medium used in the method, and a data recording / reproducing apparatus.
第１図は光デイスクにデータを記録する場合のフオーマ
ツトの一例を示す。データの記録単位を以後セクタと呼
ぶ。すなわち第１図はセクタフオーマツトである。デー
タは光デイスクに適した形にコード化され、変調されて
記録されるが、記録データのアクセス，クロツキツン
グ，同期，等のためデータの他同期信号，アドレス，ク
ロツク，各種マーク等を所定のフオーマツトに従つて記
録する。第１図で１はセクタの始まりを示すマーク、４
０がアドレス情報、４１がデータであるが、これらアド
レスやデータを読むためクロツキングおよび同期信号と
して、２０，２１および３０，３１が記録される。２
０，２１のクロツキングのための領域は、この間でフエ
ーズロツクループ(PLL)を作動させ、４０および４１を
読むためのクロツクを生成する。同期信号３０，３１は
それぞれ記録情報４０，４１の始点を示すものである。FIG. 1 shows an example of a format for recording data on an optical disk. The data recording unit will be referred to as a sector hereinafter. That is, FIG. 1 shows a sector format. The data is coded in a form suitable for an optical disk and is recorded after being modulated. For access, clocking, synchronization, etc. of the recorded data, other than the data, a synchronizing signal, an address, a clock, various marks, etc. are formed in a predetermined format. Record according to. In FIG. 1, 1 is a mark indicating the start of a sector, 4
Although 0 is address information and 41 is data, 20, 21 and 30, 31 are recorded as clocking and synchronizing signals for reading these addresses and data. Two
The area for clocking 0,21 activates the phase lock loop (PLL) during this time, producing a clock for reading 40 and 41. The sync signals 30 and 31 indicate the starting points of the record information 40 and 41, respectively.
第１図に近いフオーマツトは従来磁気記録装置等におい
ても一般的に用いられているが、磁気記録の場合と光デ
イスクの場合では記録媒体の特性が基本的に異なる。そ
のため第１図の如きフオーマツトは類似であつても記録
内容自体は全く異なつたものである。とくに光デイスク
媒体では記録密度が高いこともあつて、エラ率が磁気媒
体にくらべ大きいという問題がある。そこで上記フオー
マツトに於て、２０，２１および３０，３１等の具体的
記録方式，検出方式には従来と異なつた光デイスク特有
の条件を考慮しなければならない。Although the format close to that shown in FIG. 1 is generally used in the conventional magnetic recording apparatus and the like, the characteristics of the recording medium are basically different between the magnetic recording and the optical disk. Therefore, even if the format as shown in FIG. 1 is similar, the recorded content itself is completely different. In particular, the optical disk medium has a high recording density, and thus has a problem that the error rate is larger than that of the magnetic medium. Therefore, in the above-mentioned format, it is necessary to consider the conditions peculiar to the optical disk, which are different from the conventional ones, in the specific recording system and detection system such as 20, 21, 30 and 31.
光デイスクでのコード化方式および変調方式としていく
つかの方式が考えられるが、データ語をコード語に変換
したときの比率すなわち、 が２のものが多く用いられる。デイスクへの記録はコー
ド語の“１”の部分にピツトを形成して行なう。データ
のビツト周波数をとすると、コード語の周波数は２
となる。そこでデータ再生に於ては読出したコード語か
ら２のクロック周波数を再生し、コード語からデータ
語への逆変換すなわちデコードを行なう。再生データは
のクロック周波数をもつから、デコードの過程で２
からへの変換が必要になる。これには２を1/2分周
すれば良いが、２を1/2分周すると出力のには２通
りの位相が生じ、正しいデコードにはこの２通りのうち
から正しい位相のものを選ばねばならない。すなわちデ
コードに必要なクロツクの位相を決定する必要がある。
また記録データの始点を知るための同期信号に対して
も、特定の同期パタンを記録するが、その検出は読出さ
れた再生信号と同期パタンとを照合し一致したことを検
出して同期信号としている。従つて同期パタン中に誤り
があると、例え１ビツト誤りであつても正常な同期検出
がなされない。しかしながら光デイスク媒体の誤り率は
大きく、ビツト誤り率で１０-5〜１０-6程度は許容して
システムを組立てねばならない。いまビツト誤り率をｐ
とし、同期パタンの長さをＢビツトとすると、同期パタ
ン中に１個以上の誤りが含まれる確率は近似的にＢｐと
なる。この値はデイスクに記録されたデータの誤り率と
の関係で許容し得ない。たとえばデータの誤り率として
１０-10〜１０-12等の品質を達成しようとする場合、デ
ータ部については誤り訂正符号の付加によりｐ３に比例
した形で誤りを低減することができる（たとえば２重誤
り訂正符号を用いる）が、同期信号がｐに比例した値で
誤つたのではデータ部での誤り処理は全く無意味になつ
てしまう。なぜならデータ部の処理は、クロツク信号や
同期信号が正確であることを前提として成立つためであ
る。光デイスクの誤り率が上記の如く大きい値であるか
ら、従来方式による同期検出では高い信頼度のデータ再
生ができないという問題がある。There are several possible coding and modulation methods for optical discs, but the ratio when converting data words to code words, that is, 2 is often used. Recording on the disk is performed by forming a pit at the "1" portion of the code word. If the bit frequency of the data is, the frequency of the code word is 2
Becomes Therefore, in the data reproduction, the clock frequency of 2 is reproduced from the read code word, and the reverse conversion, that is, the decoding from the code word to the data word is performed. Since the reproduced data has a clock frequency of, 2
Conversion from to is required. To do this, divide 2 by 1/2, but if 2 is divided by 1/2, two phases will occur in the output, and for correct decoding, select the correct phase from these two. I have to. That is, it is necessary to determine the clock phase required for decoding.
A specific sync pattern is also recorded with respect to the sync signal for knowing the start point of the recorded data, but the detection is performed by comparing the read reproduction signal with the sync pattern, detecting that they match, and using this as the sync signal. There is. Therefore, if there is an error in the sync pattern, normal sync detection cannot be performed even if the error is one bit. However, the error rate of the optical disk medium is large, and a bit error rate of about 10 -5 to 10 -6 must be allowed and the system must be assembled. The bit error rate is now p
If the length of the synchronization pattern is B bits, the probability that one or more errors are included in the synchronization pattern is approximately Bp. This value is unacceptable in relation to the error rate of the data recorded on the disk. For example, when an attempt is made to achieve a data error rate of 10 −10 to 10 −12 , the error can be reduced in the data portion in a form proportional to p 3 by adding an error correction code (for example, 2 However, if the synchronization signal is erroneous with a value proportional to p, the error processing in the data section becomes completely meaningless. This is because the processing of the data portion is established on the premise that the clock signal and the synchronizing signal are accurate. Since the error rate of the optical disk is a large value as described above, there is a problem that data reproduction with high reliability cannot be performed by the conventional synchronization detection.
なお、本発明に関連して、特開昭５７−１６４４４３号
や特開昭５６−１０１６５２号、特開昭５６−１３７５
３１号等があり、これらには同期情報として一ケの長パ
タンを用いた例が開示されている。Incidentally, in connection with the present invention, JP-A-57-164443, JP-A-56-101652 and JP-A-56-1375.
No. 31, etc., which disclose an example using one long pattern as the synchronization information.
本発明の目的は、記録媒体に誤りがあっても、それが所
定の範囲内である限り、正しい同期信号の検出を可能と
し、データ再生の信頼性を向上させたデータの記録再生
方法、その方法に使用するディスク媒体及びそのデータ
記録再生装置を提供することにある。An object of the present invention is to provide a data recording / reproducing method capable of detecting a correct sync signal even if there is an error in a recording medium as long as it is within a predetermined range, and improving the reliability of data reproduction. A disc medium used in the method and a data recording / reproducing apparatus thereof are provided.
本発明は、所定のコードビット長を有する２種類以上の
シンボルを用い、該シンボルを所定の配列で複数個直列
状につなげた所定の長さのシンボル列を同期パタンと
し、該同期パタンを記録すべき所定の単位のコード化情
報の前部に付加してディスク媒体に記録することを特徴
とする。そして、上記ディスク媒体から読出した信号を
上記同期パタンを参照パタンとして照合し、該参照パタ
ンと一致するシンボルの数を所定のしきい値と比較して
上記コード化情報の始点を示す同期信号を得ることを特
徴とする。The present invention uses two or more kinds of symbols having a predetermined code bit length, and a plurality of symbols are connected in series in a predetermined array to form a symbol string of a predetermined length as a synchronization pattern, and the synchronization pattern is recorded. It is characterized in that it is added to the front of the coded information in a predetermined unit to be recorded and recorded on the disk medium. Then, the signal read from the disk medium is collated using the synchronization pattern as a reference pattern, the number of symbols matching the reference pattern is compared with a predetermined threshold value, and a synchronization signal indicating the starting point of the coded information is obtained. It is characterized by obtaining.
本発明における同期パタンは、その自己相関関数にする
どいピークを持ち、正しい同期タイミング以外では小さ
な自己相関々数となるようにし、多数決論理すなわちｎ
個の同期検出出力中ｍ個以上（ｍ＜ｎ）から検出された
とき同期信号出力を出すものである。The synchronization pattern according to the present invention has a sharp peak corresponding to its autocorrelation function, and has a small autocorrelation number other than the correct synchronization timing.
When m or more (m <n) of the sync detection outputs are detected, a sync signal is output.
以下実施例により本発明を詳細に説明する。データの記
録変調方式としていくつかのものが考えられるが、同期
パタンもデータの変調規則と同様とする。この条件はデ
ータと同一の再生回路，検出回路を用いることからの要
請である。第２図は本発明の実施例におけるコード化規
則を示す。デイスクにはコード語の“１”の部分にピツ
トを形成することで記録される。従つて読出した信号は
コード語の“１”の部分のみであり、これらクロツクお
よびデータを再生する。同期信号パタンも第２図の規則
と矛盾しないものとする。The present invention is described in detail below with reference to examples. There are several possible data recording modulation methods, and the synchronization pattern is the same as the data modulation rule. This condition is a request from using the same reproducing circuit and detecting circuit as the data. FIG. 2 shows a coding rule in the embodiment of the present invention. The disk is recorded by forming a pit at the "1" portion of the code word. Therefore, the read signal is only the "1" portion of the code word, and these clocks and data are reproduced. The synchronization signal pattern is also consistent with the rule of FIG.
第３図(イ)は本発明における同期パタンの一実施例であ
る。ただし記号Ａ，Ｂ，Ｃはそれぞれ Ａ＝（１０００），Ｂ＝（０１００），Ｃ＝（００１
０）なるパタンである。本実施例における同期パタン長
は３バイトの場合であるが、他の長さでも良い。検出に
は第３図(ロ)に示す３バイトパタンを参照パタンとして
用い、読出しパタンと参照パタンとを照合してその一致
の程度を調べる。第４図はＡ，Ｂ，Ｃをそれぞれ１つの
シンボルと考え、読出パタンと参照パタンがシンボル単
位で、タイミングのずれに対してどのような一致の度合
いを示すかを調べたものである。すなわち、第４図(イ)
において、ｔ＝０の時刻は正しい同期タイミングを示
し、ｔ＜０は正しい時刻よりも前を、ｔ＞０は後を示
す。ｔ軸はデータのビツト単位である。ｔ＝０では３バ
イトのパタン（すなわち１２個のシンボル）がすべて一
致するが、ｔ≠０での一致数は少ない。従つてたとえば
シンボル一致数が８以上のとき同期信号SYNCパルス（第
４図(ロ)に示す）を出力すれば同期パタン中の任意の４
シンボルに誤りが生じても正しく同期信号を検出するこ
とができる。なおデータ中等に類似のパタンが生じて誤
ることがないように同期検出ゲート信号第４図(ハ)を用
いる。このゲート信号は第１図のセクタマーク１の検出
信号などから発生するが、特別困難はないのでここでは
省略する。第５図は同期信号検出回路の一実施例を示
す。デイスクから読出された信号は第２図のコード語の
“１”に対応した信号でこの読出信号５０は再生クロツ
ク５１によりシフトレジスタ６に取込まれる。シフトレ
ジスタ６は少なくとも前記１２シンボル分の情報をコー
ド語単位で扱える段数をもつ。シフトレジスタ６の出力
６０はデコーダ７によりシンボル単位でデコードされ
る。デコードは第３図(ロ)の参照パタンとの照合により
行なう。具体的には各シンボルについて第６図の如き構
成で実現できる。デコーダ７の出力７０はシンボルの数
（１２個）で、これを多数決論理回路８へ導く。ここで
はｎ個のうちｍ個以上（ｍ＜ｎ）が成立つたことの検
出、すなわち の組合せの入力に対し出力８０を出す。この出力はゲー
ト信号９１（第４図(ハ)）とアンドゲート９０でゲート
され、同期信号９２（第４図(ロ)）として出力され、デ
ータ復号に於ける時間基準点として用いられる。ここで
第５図のゲート９０に入る信号９３はクロツクの位相情
報である。すなわち同期信号は特定のクロツクの位相の
時に生じるから、他の位相で出力が出ることを阻止し、
誤りの発生確率をさらに下げる目的である。即ち第１図
の２０の部分でクロツク再生とともにシンボル同期タイ
ミング（４コードビツト）を検出すれば、これをクロツ
ク位相情報９３として用いることで誤り発生確率を低減
できる。第７図は同期パタンを２つ用いた場合で、例え
ば大きな媒体の欠かんにより同期パタン全体が消される
ような場合であつても、２つの同期パタンのうちいずれ
か一方でも正しい同期信号検出ができるようにしたもの
である。なお、第７図(イ)はフオーマツトの一例を示
し、第７図(ロ)及び(ハ)は、同期検出ゲート信号である。
第８図はこの場合の検出回路で、第５図にくらべアンド
ゲート９０２、所定の時間遅延回路９４、オアゲート９
５を追加し、ゲート信号として９１２を新設するのみで
よい。FIG. 3A shows an embodiment of the synchronization pattern according to the present invention. However, the symbols A, B, and C are A = (1000), B = (0100), and C = (001, respectively.
0) pattern. Although the synchronization pattern length in this embodiment is 3 bytes, other lengths may be used. For detection, the 3-byte pattern shown in FIG. 3B is used as a reference pattern, and the read pattern and the reference pattern are collated to check the degree of coincidence. FIG. 4 considers each of A, B, and C as one symbol, and examines how the read pattern and the reference pattern are in symbol units and how they match with respect to the timing shift. That is, FIG. 4 (a)
In, the time of t = 0 indicates the correct synchronization timing, t <0 indicates before the correct time, and t> 0 indicates after. The t-axis is a bit unit of data. When t = 0, all 3-byte patterns (that is, 12 symbols) match, but the number of matches when t ≠ 0 is small. Therefore, if the sync signal SYNC pulse (shown in FIG. 4 (b)) is output when the number of symbol coincidences is 8 or more, for example, any 4 in the sync pattern will be output.
Even if an error occurs in the symbol, the sync signal can be correctly detected. It should be noted that the synchronization detection gate signal shown in FIG. 4C is used so that a similar pattern is not generated in the data or the like and is not mistaken. This gate signal is generated from the detection signal of the sector mark 1 in FIG. 1 and the like, but since it is not particularly difficult, it is omitted here. FIG. 5 shows an embodiment of the sync signal detection circuit. The signal read from the disk is a signal corresponding to the code word "1" in FIG. 2 and the read signal 50 is taken into the shift register 6 by the reproduction clock 51. The shift register 6 has a number of stages capable of handling at least 12 symbols of information in codeword units. The output 60 of the shift register 6 is decoded by the decoder 7 in symbol units. Decoding is performed by collating with the reference pattern shown in FIG. Specifically, each symbol can be realized by the configuration as shown in FIG. The output 70 of the decoder 7 is the number of symbols (12) and guides this to the majority logic circuit 8. Here, detection that m or more (m <n) of n is established, that is, Output 80 is output for the input of the combination of This output is gated by a gate signal 91 (Fig. 4 (c)) and an AND gate 90 and output as a synchronizing signal 92 (Fig. 4 (b)), which is used as a time reference point in data decoding. The signal 93 entering the gate 90 in FIG. 5 is the phase information of the clock. In other words, the sync signal is generated at the phase of a specific clock, so it prevents the output from being output at other phases.
The purpose is to further reduce the probability of error. That is, if the symbol reproduction timing (4 code bits) is detected at the same time as the clock reproduction in the portion 20 of FIG. 1, the error occurrence probability can be reduced by using this as the clock phase information 93. FIG. 7 shows a case in which two synchronization patterns are used, and even if the entire synchronization pattern is erased due to lack of a large medium, for example, correct synchronization signal detection can be performed in either one of the two synchronization patterns. It was made possible. Incidentally, FIG. 7 (a) shows an example of the format, and FIGS. 7 (b) and 7 (c) show the synchronization detection gate signal.
FIG. 8 shows a detection circuit in this case, which is different from that of FIG. 5 in that it has an AND gate 902, a predetermined time delay circuit 94, and an OR gate 9.
5 is added and 912 is newly provided as a gate signal.
以下本発明による同期信号の検出信頼度について説明す
る。第４図に於て誤りの発生によりｔ＝０でシンボルの
一致数をｍ個下げる確率はほぼＰｓ(m)と考えられる。
ただしＰｓ(m)はｍシンボル長のバースト誤り発生確率
である。一方ｔ≠０の点でシンボルの一致数をｋ個増す
確率はほぼPs(k)Pt kと考えられる。ただしＰｔはあるシ
ンボルが別のシンボルに誤る確率である。同期信号検出
の多数決論理回路閾値がｔ＝０での一致数よりＭ個少な
く、ｔ≠０での最大一致数よりＫ個大い値であるとした
場合（第４図の実施例では上記閾値を８とするとＭ＝Ｋ
＝４となる）には、ｔ＝０で同期パルスが生じない確率
はＰｓ(5)また、ｔ≠０で偽の同期パルスが生じる確
率はPs(4)Pt 4となる。また第８図の如く２重化すれ
ば、ｔ＝０での誤る確率は｛Ps(M+1)}2＝(Ps(5))2ま
たは悪くてもPs{2(M+1)}＝Ps(10)以下に改善される。上
記誤り率は、従来方式でＢｐであつたのにくらべ大き
く改善される。上記誤り率の評価は、デイスクをバース
トチアネルとして扱つたものである。誤りがランダムで
ある場合には上記評価結果にくらべ十分小さく問題な
い。Hereinafter, the detection reliability of the synchronization signal according to the present invention will be described. In FIG. 4, the probability that the number of coincidences of the symbols is decreased by m at t = 0 due to the occurrence of an error is considered to be approximately P s (m).
However, P s (m) is the probability of burst error occurrence of m symbol length. On the other hand, the probability of increasing the number of matching symbols by k at t ≠ 0 is considered to be approximately P s (k) P t k . However, P t is the probability that one symbol is mistaken for another symbol. When it is assumed that the majority logic circuit threshold value for synchronization signal detection is M less than the number of coincidences at t = 0 and K larger than the maximum number of coincidences at t ≠ 0 (in the embodiment of FIG. Let be 8 and M = K
= 4), the probability that a sync pulse will not occur at t = 0 is P s (5), and the probability that a false sync pulse will occur when t ≠ 0 is P s (4) P t 4 . In addition, if doubled as shown in FIG. 8, the probability of error at t = 0 is {P s (M + 1)} 2 = (P s (5)) 2 or at worst P s {2 (M + 1)} = P s (10 ) is improved to below. The error rate is greatly improved as compared with the case of using Bp in the conventional method. The evaluation of the error rate is performed by treating the disk as a burst cyanel. When the error is random, it is sufficiently smaller than the above evaluation result and there is no problem.
以上説明したごとく本発明によれば、デイスク媒体の誤
り発生率をある程度許容して、十分高い信頼度の同期信
号検出を可能とする。従来方式による同期信号の誤り発
生確率（Ｂｐ）では、ｐ＝１０-5〜１０-6程度の媒体
品質レベルに対し、どのように高能力かつ複雑な誤り訂
正をデータ部にほどこしても、高い信頼度でのデータ記
録再生は実現しえない。従つて本発明によつてはじめて
実用的信頼度レベルでのデータ記録再生を実現できその
効果は非常に大きいものである。As described above, according to the present invention, the error occurrence rate of the disk medium is allowed to some extent, and the synchronization signal can be detected with sufficiently high reliability. The error occurrence probability (Bp) of the synchronization signal according to the conventional method is high for a medium quality level of p = 10 −5 to 10 −6 , no matter how high-performance and complicated error correction is applied to the data section. Data recording / playback with reliability cannot be realized. Therefore, according to the present invention, the data recording / reproducing at the practical reliability level can be realized for the first time, and the effect is very large.
第１図は光デイスクでの記録フオーマツトの一例を示す
図、第２図はデータのコード化の一例を示す図、第３図
は本発明実施例での同期パタンを示す図、第４図は本発
明実施例に於ける同期パルス検出時の特性を示す図、第
５図は同期パルス検出回路の実施例を示す図、第６図は
第５図のデコーダ回路の具体例を示す図、第７図は同期
パタンの第１図とは異なる記録例を示す図、第８図は第
７図に対応した検出回路の実施例を示す図である。FIG. 1 is a diagram showing an example of a recording format on an optical disk, FIG. 2 is a diagram showing an example of data coding, FIG. 3 is a diagram showing a synchronization pattern in an embodiment of the present invention, and FIG. FIG. 5 is a diagram showing a characteristic at the time of detecting a sync pulse in the embodiment of the present invention, FIG. 5 is a diagram showing an embodiment of the sync pulse detection circuit, FIG. 6 is a diagram showing a concrete example of the decoder circuit of FIG. FIG. 7 is a diagram showing a recording example different from that of FIG. 1 of the synchronization pattern, and FIG. 8 is a diagram showing an embodiment of the detection circuit corresponding to FIG.
Claims (6)
Ａ，Ｂ，及びＣを配列して同期パタンとし、該同期パタ
ンを所定の単位のコード化データの前部に付加して光デ
ィスク媒体に光学的に再生可能な形態で記録し、該ディ
スク媒体から信号を光学的に読み出し、上記同期パタン
と同じシンボル列を参照パタンとし、読み出した信号を
上記参照パタンと照合し、該照合結果に基づいて上記デ
ータの始点を示す同期信号を得る光学的情報記録再生方
法であって、上記シンボルＡは（１０００）、Ｂは（０
１００）、Ｃは（００１０）の４ビットパタンであり、
これらをＢＣＢＣＣＣＢＢＡＣＢＡの順につなげて同期
パタンとしたことを特徴とする光学的情報記録再生方
法。1. An optical disk medium in which three types of symbols A, B, and C having a predetermined bit length are arranged to form a synchronization pattern, and the synchronization pattern is added to the front part of encoded data of a predetermined unit. It is recorded in an optically reproducible form, a signal is optically read out from the disk medium, the same symbol sequence as the synchronization pattern is used as a reference pattern, the read signal is collated with the reference pattern, and based on the collation result. In the optical information recording / reproducing method, a symbol A indicates (1000) and a symbol B indicates (0).
100) and C are 4-bit patterns of (0010),
An optical information recording / reproducing method, characterized in that these are connected in the order of BCBCCCBBACBA to form a synchronization pattern.
所定のしきい値と比較し、該比較結果に基づいて上記デ
ータの始点を示す同期信号を得る特許請求の範囲第１項
記載の光学的情報記録再生方法。2. The optical system according to claim 1, wherein the number of symbols matching the reference pattern is compared with a predetermined threshold value, and a synchronization signal indicating the starting point of the data is obtained based on the comparison result. Information recording and reproducing method.
ータの記録に先立って前記同期パタンと同じ同期パタン
を前部に付加したアドレス情報を記録しておき、該アド
レス情報の前部に付加した同期パタンから該アドレス情
報の始点を示す同期信号を得る特許請求の範囲第１項ま
たは第２項記載の光学的情報記録再生方法。3. Prior to the recording of the coded data to which the synchronization pattern is added, address information in which the same synchronization pattern as the synchronization pattern is added to the front part is recorded and added to the front part of the address information. The optical information recording / reproducing method according to claim 1 or 2, wherein a synchronization signal indicating a starting point of the address information is obtained from a synchronization pattern.
加する特許請求の範囲第１項乃至第３項のうちいずれか
に記載の光学的情報記録再生方法。4. The optical information recording / reproducing method according to any one of claims 1 to 3, wherein a plurality of the synchronization patterns are connected in series and added.
ータの記録に先立って特定のマークを記録しておき、該
マークの読み出し信号から上記同期信号の検出を所定の
範囲内に制限するゲート信号を得る特許請求の範囲第１
項乃至第４項のうちいずれかに記載の光学的情報記録再
生方法。5. A gate signal for recording a specific mark in advance of recording the coded data to which the synchronization pattern is added and limiting detection of the synchronization signal from a read signal of the mark within a predetermined range. Claim 1 to obtain
Item 5. The optical information recording / reproducing method according to any one of items 4 to 4.
語の比が２なるコード化方式によって変換したものであ
る特許請求の範囲第１項乃至第５項のうちいずれかに記
載の光学的情報記録再生方法。6. The optical system according to any one of claims 1 to 5, wherein the coded data is converted by a coding method having a codeword-to-dataword ratio of 2. Information recording / playback method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57051229A JPH0648582B2 (en) | 1982-03-31 | 1982-03-31 | Optical information recording / reproducing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57051229A JPH0648582B2 (en) | 1982-03-31 | 1982-03-31 | Optical information recording / reproducing method |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5317721A Division JP2515962B2 (en) | 1993-12-17 | 1993-12-17 | Optical information recording / reproducing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58169341A JPS58169341A (en) | 1983-10-05 |
| JPH0648582B2 true JPH0648582B2 (en) | 1994-06-22 |
Family
ID=12881112
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57051229A Expired - Lifetime JPH0648582B2 (en) | 1982-03-31 | 1982-03-31 | Optical information recording / reproducing method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0648582B2 (en) |
Families Citing this family (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3428327B2 (en) | 1996-10-11 | 2003-07-22 | 株式会社日立製作所 | Data synchronization signal detection device |
| JPH0679416B2 (en) * | 1985-05-28 | 1994-10-05 | ソニー株式会社 | Digital data synchronization method |
| NL193159C (en) * | 1985-06-19 | 1998-12-04 | Hitachi Ltd | Preformed record carrier for writing information therein by means of a light spot. |
| JPH0731877B2 (en) * | 1985-07-03 | 1995-04-10 | 株式会社日立製作所 | Information recording / reproducing method and apparatus |
| JPS6364676A (en) * | 1986-09-05 | 1988-03-23 | Fujitsu Ltd | Detection method for synchronizing signal |
| JP2725795B2 (en) * | 1988-07-04 | 1998-03-11 | 三洋電機株式会社 | PCM audio recording / reproducing circuit |
| JPH02140669U (en) * | 1989-04-26 | 1990-11-26 | ||
| US6856660B1 (en) | 1996-10-11 | 2005-02-15 | Hitachi, Ltd. | Signal processing method and apparatus and disk device using the method and apparatus |
| JP5175413B2 (en) * | 2001-03-12 | 2013-04-03 | ソニー株式会社 | Disc recording medium, reproducing device, recording device |
| CN100350467C (en) * | 2001-03-12 | 2007-11-21 | 索尼公司 | Disc-shaped recording medium |
| JP5170605B2 (en) * | 2001-03-16 | 2013-03-27 | ソニー株式会社 | Recording apparatus and method, reproducing apparatus and method, recording medium, program, and disk medium |
| JP4496454B2 (en) * | 2001-03-19 | 2010-07-07 | ソニー株式会社 | Recording apparatus and method, reproducing apparatus and method, recording medium, program, and disk medium |
| JP4534387B2 (en) | 2001-03-19 | 2010-09-01 | ソニー株式会社 | Recording apparatus and method, reproducing apparatus and method, recording medium, program, and disk medium |
| JP5170709B2 (en) * | 2001-03-19 | 2013-03-27 | ソニー株式会社 | REPRODUCTION DEVICE, RECORDING DEVICE, CONTROL CHIP, AND DISC MEDIUM |
| JP4300727B2 (en) | 2001-10-09 | 2009-07-22 | ソニー株式会社 | DISC RECORDING MEDIUM, DISC DRIVE DEVICE, REPRODUCTION METHOD, AND DISC MANUFACTURING METHOD |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5580867A (en) * | 1978-12-12 | 1980-06-18 | Sony Corp | Block synchronous signal extracting circuit |
| JPS5616832U (en) * | 1979-07-18 | 1981-02-14 |
-
1982
- 1982-03-31 JP JP57051229A patent/JPH0648582B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58169341A (en) | 1983-10-05 |
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