JPS5948870A - Random access device of video disk player - Google Patents
Random access device of video disk playerInfo
- Publication number
- JPS5948870A JPS5948870A JP15660582A JP15660582A JPS5948870A JP S5948870 A JPS5948870 A JP S5948870A JP 15660582 A JP15660582 A JP 15660582A JP 15660582 A JP15660582 A JP 15660582A JP S5948870 A JPS5948870 A JP S5948870A
- Authority
- JP
- Japan
- Prior art keywords
- carriage
- track
- signal
- tracks
- random access
- 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
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B21/00—Head arrangements not specific to the method of recording or reproducing
- G11B21/02—Driving or moving of heads
- G11B21/08—Track changing or selecting during transducing operation
- G11B21/081—Access to indexed tracks or parts of continuous track
- G11B21/083—Access to indexed tracks or parts of continuous track on discs
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
- G11B7/085—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam into, or out of, its operative position or across tracks, otherwise than during the transducing operation, e.g. for adjustment or preliminary positioning or track change or selection
- G11B7/08505—Methods for track change, selection or preliminary positioning by moving the head
Landscapes
- Moving Of Head For Track Selection And Changing (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は、円盤状の情報記録媒体上に形成されたらせん
状または同心円状の情報トラックのうち、所望の情報ト
ラックを検索するランダムアクセスに関するものである
。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to random access for searching for a desired information track among spiral or concentric information tracks formed on a disc-shaped information recording medium.
ディスク再生装置し、ディスク半径方向上に読取部を移
送してディスク上の任意の場所の情報を再生できること
が大きな特徴となっている。A major feature of the disc playback device is that it can reproduce information from any location on the disc by moving the reading section in the radial direction of the disc.
レーザを用いて情報を光学的に再生ずる装置、あるいは
相隣る主要情報信号のトラック間の略中間部分にトラッ
キング制御用参照信号を記録することにより、針案内溝
を無くしたディスクから、針を用いて静電容量の変化を
検知再生して情報を再生する装置では、読取部が何ら抵
抗を受けることなくディスク半径方向に移動できる０
上記の再生装置では、ディスク半径方向に読取部を移動
することが簡単で、プログラムの進行を変化できるだめ
、各情報トランクに番地と唸るアドレス情報を記録して
おくことにより、各情報トラックが独立して、任意のア
ドレス指定によってランダムアクセスできる様になって
いる。The needle can be removed from a disk without a needle guide groove by using a device that optically reproduces information using a laser, or by recording a tracking control reference signal approximately in the middle between adjacent tracks of main information signals. In a device that reproduces information by detecting and reproducing changes in capacitance using a device, the reading section can move in the radial direction of the disk without receiving any resistance. In order to easily change the progress of the program, by recording the address information in each information trunk, each information track can be accessed independently and randomly by specifying any address. There is.
従来のランダムアクセス制御回路を第１図に示す。１は
再生記録円板、２け前盲己記録円板を回転させるための
モータ、べはレーザ光の集束スポットを円板１（（照射
１反射光から’１？、 Ｍ信号を得る光学部、４は、円
板１の偏心によるトラック振れに光スポットを追従させ
るだめのアクチュエータ＝３ ５は増幅回路、６は信号
復調回路、７は垂直帰線期間に記録されプでアドレス信
号を抜き取り復調する回路、８はトラック撮れに光スポ
ットを追従する様にするだめのトラッキング制御回路、
９は光学部６およびアクチーエータ４が塔載されたキャ
リッジ全体を半径方向に移送するだめの送υ制御回路、
１０けシーケンス制御回路である。こい制御回路におい
て、従来は、ディスク１に配録されたアドレス情報を読
み取シながら、キャリッジ移送速度を高速送りモード、
中速送シモード通常再生モードと移送速度を切換えなが
ら行なっていた。この従来方式において、情報トラック
の検索時間を早くするためにキャリッジ移送速度を速く
すると、再生信号のＳＡが劣化し、アドレスデータの確
実な読み取シができないという問題が生じ、検索時間を
早くすることが出来ないという問題があった。また、対
物レンズあるいは再生針の傾きに応じてトラッキングル
ープをオン、オフしながら高速送シをする方式では、送
り速度を早くすると前に入力されたアドレス信号と次に
読みとられるアドレス信号の差が大きすぎて、光スポッ
トおよび再生針が目標値よりも大きくずれすぎ、逆に中
速送シモードの時間が長くなり、結果的にランダムアク
セスの時間が長くなるという問題、あるいは雑音、ドロ
ップアウト等によって誤まったアドレス情報が入力され
て誤判定するという問題もあった。A conventional random access control circuit is shown in FIG. 1 is a reproducing recording disk, a motor for rotating the 2-digit forward blind self-recording disk, and 1 is an optical section that converts the focused spot of the laser beam onto the disk 1 (('1? from the irradiation 1 reflected light) and obtains the M signal. , 4 is an actuator for making the optical spot follow the track runout caused by the eccentricity of the disc 1 = 3 5 is an amplifier circuit, 6 is a signal demodulation circuit, 7 is an address signal recorded during the vertical retrace period, which extracts and demodulates the address signal. 8 is a tracking control circuit that allows the light spot to be followed when taking a track.
9 is a transport control circuit for radially transporting the entire carriage on which the optical section 6 and actuator 4 are mounted;
This is a 10-digit sequence control circuit. Conventionally, in the control circuit, while reading the address information recorded on the disk 1, the carriage transport speed is set to high-speed feed mode.
Medium-speed transfer mode, normal playback mode, and transfer speed were switched. In this conventional method, if the carriage transport speed is increased in order to speed up the search time for the information track, the SA of the reproduced signal deteriorates, making it impossible to reliably read the address data. The problem was that it was not possible. In addition, in the method of high-speed feeding while turning on and off the tracking loop according to the tilt of the objective lens or playback needle, increasing the feeding speed causes a difference between the previously input address signal and the next read address signal. is too large, the optical spot and playback needle deviate too much from the target value, conversely, the time in medium speed mode becomes longer, and as a result, the time for random access becomes longer, or there are problems such as noise, dropouts, etc. There was also the problem that incorrect address information was input and incorrect judgments were made.
本発明の目的は、上記問題点を解決しランダムアクセス
を高速度に行ない得る情報信号再生装置を提供すること
にある。SUMMARY OF THE INVENTION An object of the present invention is to provide an information signal reproducing device that solves the above problems and can perform random access at high speed.
そこで本発明においては上記目的を達成するために、高
速送りモードの時にはアドレスデータの読み取シを行な
わず、再生ＦＭ信号のエンベロープからトラック交差数
を検出し、中速送シモードの時には、アドレス差に対応
した数のパルスを発生して光スポットを移動させ、この
パルスによシ常にアドレスを比較することなく読取部を
情報トラック半径方向上に移送する方法を採用した。Therefore, in the present invention, in order to achieve the above object, the number of track crossings is detected from the envelope of the reproduced FM signal without reading the address data when in the high-speed feed mode, and the number of track crossings is detected from the envelope of the reproduced FM signal when in the medium-speed feed mode. A method was adopted in which a corresponding number of pulses were generated to move the light spot, and the pulses were used to move the reading section in the radial direction of the information track without constantly comparing addresses.
以下本発明の実施例を図面を用いて説明すん第２図は本
発明のランダムアクセス制御系のブロック図を示すもの
で、第１図と同一機能の部分には同一符号をつけである
。トラック交差検出回路１１は、高速送りモードの時に
トラックの交差数を検出するだめのもので、ＦＭ信号を
検波するための包絡線検波回路、波形整形回路等で構成
される。トラッキング制御回路８をオフの状態にして、
光学部６およびアクチーエータ部４を搭載したキャリッ
ジを移動すると、増幅回路５から得られるＦＭ信号の包
絡線検波出力は、ディスク１の情報が記録されているビ
ット部分では出力最大となり、ビットとビット間のガー
トバンド部分では出力最小２なろだめ、第６図（ａ）に
示す様な波形が得られる。したがって、ＦＭ信号の包絡
線検波出力のサイン状波の数は、光スポットがよと配っ
たトラック数を示している。 トラック交差検出−１路
１１では、このＦＭ信号の包絡線検波出力を波形整形し
て第６図（ｂ）に示す様な波形に変換し、シーケンス制
御回路１０に入力する。シーケンス制御回路１０では、
この入力信号のたとえば立ち上りエツジをカウントし、
交差トラック数をカウントする。Embodiments of the present invention will be described below with reference to the drawings. FIG. 2 shows a block diagram of a random access control system of the present invention, and parts having the same functions as those in FIG. 1 are given the same reference numerals. The track crossing detection circuit 11 is for detecting the number of track crossings in the high-speed feed mode, and is composed of an envelope detection circuit, a waveform shaping circuit, etc. for detecting the FM signal. Turn off the tracking control circuit 8,
When the carriage carrying the optical section 6 and the actuator section 4 is moved, the envelope detection output of the FM signal obtained from the amplifier circuit 5 becomes maximum in the bit part where information of the disc 1 is recorded, and the output between the bits becomes the maximum. In the guard band portion of , the minimum output is 2, and a waveform as shown in FIG. 6(a) is obtained. Therefore, the number of sine waves in the envelope detection output of the FM signal indicates the number of tracks on which the optical spots are distributed. In the track crossing detection-1 path 11, the envelope detection output of this FM signal is waveform-shaped and converted into a waveform as shown in FIG. 6(b), which is input to the sequence control circuit 10. In the sequence control circuit 10,
For example, count the rising edges of this input signal,
Count the number of intersecting tracks.
第４図に、ランダムアクセス時の制御アルゴリズムを示
す。目標値と現在の再生トラックへたとえば３００トラ
ック以上と非常に離れている場合にハ、トラッキング制
御回路８をオフにした状態でキャリッジを移動１１、ト
ラック交差検出回路１１から得られる矩形波から交差し
たトラック数を計算する。目標値と交差したトラック数
の差が５０トラック以内に達したならば、トラツキング
制御回路８をオンにする。その後は各トラックの垂直帰
線期間に相当する部分に挿入されているアドレス信号を
読み取り、このときのアドレス情報タと目標アドレスの
差に応じたトラック飛び越しパルスをトラッキング制御
回路８に印加しながら、光スポットを移動させ、その後
目標値に達したかどうかを判定する。以下このくり返し
を目標アドレスに達するまで行々う。FIG. 4 shows a control algorithm during random access. If the target value and the current playback track are very far apart, for example, 300 tracks or more, move the carriage 11 with the tracking control circuit 8 turned off, and detect the intersection from the rectangular wave obtained from the track intersection detection circuit 11. Calculate the number of tracks. When the difference in the number of tracks crossing the target value reaches within 50 tracks, the tracking control circuit 8 is turned on. Thereafter, the address signal inserted in the portion corresponding to the vertical retrace period of each track is read, and a track skip pulse corresponding to the difference between the address information data and the target address at this time is applied to the tracking control circuit 8. The light spot is moved and then it is determined whether the target value has been reached. This process is repeated until the target address is reached.
なお、再生Ｆ Ｍ信号としては、ＦＭ変訓された映像情
報信号の他に、フィルターを設けて音声キャリアのみを
抜きとり、この音声キャリアのレベル背比な検出する様
な方式でもよい。In addition to the FM-modified video information signal, the reproduced FM signal may be a system in which a filter is provided to extract only the audio carrier, and the level comparison of this audio carrier is detected.
以上説明した様に、本発明によれば、高速送り時の再生
映像信号のシ公の劣化等の問題もなく、指定されたアド
レス情報が記録されたトラック上にピックアップ手段を
確実に位置せしめることが出来る。As explained above, according to the present invention, there is no problem such as deterioration of the reproduced video signal during high-speed forwarding, and the pickup means can be reliably positioned on the track on which designated address information is recorded. I can do it.
は同じくトラック交差検出回路の波形図、第４図は本発
明の制御アルゴリズムの一実施例を示すブロック図であ
る。Similarly, FIG. 4 is a waveform diagram of the track crossing detection circuit, and FIG. 4 is a block diagram showing an embodiment of the control algorithm of the present invention.
１・・・・・・再生記録円板、
６・・・・・・光学へ
４・・・・・・アクチーエータ部、
８・・・・・・トラッキング制御回路、９・・・・・・
キャリッジ送り制御回路、１０・・・・・・シーケンス
制御回路、１１・・・・・・トラック交差検出回路、代
理人弁理士 薄 １）利 幸
オ ３ 図
第４ 口DESCRIPTION OF SYMBOLS 1...Reproduction recording disc, 6...To optics 4...Actuator section, 8...Tracking control circuit, 9...
Carriage feed control circuit, 10...Sequence control circuit, 11...Track crossing detection circuit, Patent attorney Susuki 1) Yukio Toshi 3 Figure 4
Claims (1)
取るピックアップ手段と、前記ピックアップが記録トラ
ック上をトラッキングする様に制御するトラッキング制
御回路と、前記ピックアップを塔載したキャリッジを移
送する手段とを有するビデオディスクプレーヤのアドレ
ス情報探索において、高速道シモードの時には、再生Ｆ
Ｍ信号の包絡線検波出力からトラック交差数を検出して
前記キャリッジの移動量を制御し、中速送りモードの時
にへ目標アドレスと現在アドレスの差に対応したトラッ
ク飛び越しパルスを出力して前記ピックアップ手段およ
びキャリッジを移送する様に制御することを特徴とした
ビデオディスクプレーヤのランダムアクセス装置。1. A video device having a pickup means for reading address information in an information track of a recording medium, a tracking control circuit for controlling the pickup to track on the recording track, and a means for transporting a carriage carrying the pickup. When searching for address information on a disc player, if the expressway mode is selected, the playback F
The number of track crossings is detected from the envelope detection output of the M signal to control the movement amount of the carriage, and when in the medium speed feed mode, a track skip pulse corresponding to the difference between the target address and the current address is output to the pickup. A random access device for a video disc player, characterized in that it controls the transport of a means and a carriage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15660582A JPS5948870A (en) | 1982-09-10 | 1982-09-10 | Random access device of video disk player |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15660582A JPS5948870A (en) | 1982-09-10 | 1982-09-10 | Random access device of video disk player |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5948870A true JPS5948870A (en) | 1984-03-21 |
Family
ID=15631387
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15660582A Pending JPS5948870A (en) | 1982-09-10 | 1982-09-10 | Random access device of video disk player |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5948870A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52152704A (en) * | 1976-04-23 | 1977-12-19 | Thomson Brandt | Optical data disk reader |
| JPS5492155A (en) * | 1977-12-29 | 1979-07-21 | Matsushita Electric Ind Co Ltd | Retrieval device |
| JPS5737743A (en) * | 1980-08-20 | 1982-03-02 | Teac Co | Retrieving method of disk device |
| JPS5769536A (en) * | 1980-10-17 | 1982-04-28 | Olympus Optical Co Ltd | Random access system for optical disc |
-
1982
- 1982-09-10 JP JP15660582A patent/JPS5948870A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52152704A (en) * | 1976-04-23 | 1977-12-19 | Thomson Brandt | Optical data disk reader |
| JPS5492155A (en) * | 1977-12-29 | 1979-07-21 | Matsushita Electric Ind Co Ltd | Retrieval device |
| JPS5737743A (en) * | 1980-08-20 | 1982-03-02 | Teac Co | Retrieving method of disk device |
| JPS5769536A (en) * | 1980-10-17 | 1982-04-28 | Olympus Optical Co Ltd | Random access system for optical disc |
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