JPH0526274B2 - - Google Patents
Info
- Publication number
- JPH0526274B2 JPH0526274B2 JP1344059A JP34405989A JPH0526274B2 JP H0526274 B2 JPH0526274 B2 JP H0526274B2 JP 1344059 A JP1344059 A JP 1344059A JP 34405989 A JP34405989 A JP 34405989A JP H0526274 B2 JPH0526274 B2 JP H0526274B2
- Authority
- JP
- Japan
- Prior art keywords
- dropout
- signal
- address
- detection
- detection signal
- 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
- 238000001514 detection method Methods 0.000 claims description 36
- 238000003780 insertion Methods 0.000 claims description 3
- 230000037431 insertion Effects 0.000 claims description 3
- 230000000903 blocking effect Effects 0.000 claims description 2
- 238000000926 separation method Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 230000006378 damage Effects 0.000 description 2
- 230000003111 delayed effect Effects 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Indexing, Searching, Synchronizing, And The Amount Of Synchronization Travel Of Record Carriers (AREA)
Description
【発明の詳細な説明】
技術分野
本発明は、記録情報再生装置に関し、特に情報
検索のためのアドレス信号を含む記録情報の再生
装置に関する。TECHNICAL FIELD The present invention relates to a recorded information reproducing apparatus, and more particularly to a recorded information reproducing apparatus including an address signal for information retrieval.
背景技術
ビデオデイスク等の記録媒体には、ビデオ及び
オーデイオ情報の他に、これら情報の検索を容易
にするためにアドレス信号を含んで記録される。BACKGROUND ART In addition to video and audio information, a recording medium such as a video disk includes an address signal to facilitate retrieval of this information.
一方、再生信号におけるドロツプアウト現象は
避けられず、よつて再生信号の補償をなすべくド
ロツプアウト補償回路が付加されることが多い。
かかるドロツプアウト補償機能を有する場合にお
いて、再生信号中のアドレス信号相当期間にドロ
ツプアウトが生ずれば、当然ドロツプアウト補償
がなされてその間例えば1H（１ライン）前の信号
と置換されることになる。その結果、アドレス信
号としては正規の信号は導出されないばかりか全
く異なる補償信号が導出されることになり、情報
検索の誤検索を生じてその信頼度を著しく低下さ
せることになつて好ましくない。 On the other hand, the dropout phenomenon in the reproduced signal is unavoidable, and therefore a dropout compensation circuit is often added to compensate for the reproduced signal.
In the case where such a dropout compensation function is provided, if a dropout occurs in the period corresponding to the address signal in the reproduced signal, dropout compensation will naturally be performed and the signal will be replaced with the previous signal, for example, 1H (one line) during that time. As a result, not only a normal signal is not derived as the address signal, but also a completely different compensation signal is derived, which is undesirable because it causes erroneous information retrieval and significantly reduces its reliability.
発明の概要
［発明の目的］
そこで、本発明は、アドレス信号区間において
ドロツプアウトが発生した際に誤つたアドレス情
報等と置換されることのないようにした記録情報
再生装置を提供することを目的とする。Summary of the Invention [Object of the Invention] Therefore, an object of the present invention is to provide a recorded information reproducing device that prevents address information from being replaced with incorrect address information when dropout occurs in an address signal section. do.
［発明の構成］
本発明による記録情報再生装置は、情報検索の
ためのアドレス信号を垂直ブランキング期間内の
１部のアドレス挿入区間に含む記録ビデオフオー
マツト信号の再生信号におけるドロツプアウトを
検出して少なくともドロツプアウト発生期間に亘
つてドロツプアウト検出信号を発生するドロツプ
アウト検出回路と、前記ドロツプアウト検出信号
に応じて１水平走査区間の置換によつてドロツプ
アウト補償をなすドロツプアウト補償回路とを有
する記録情報再生装置であつて、再生信号に含ま
れる同期信号に対して所定の位置に記録されるア
ドレス信号の含まれる期間を検出してその検出期
間に亘つてアドレス区間検出信号を発生する検出
手段と、アドレス区間検出信号の存在時にのみド
ロツプアウト検出信号のドロツプアウト補償回路
への供給を阻止するゲート手段とを備えたことを
特徴としている。[Structure of the Invention] A recorded information reproducing apparatus according to the present invention detects a dropout in a reproduced signal of a recorded video format signal that includes an address signal for information retrieval in a part of the address insertion section within a vertical blanking period. A recorded information reproducing device comprising: a dropout detection circuit that generates a dropout detection signal over at least a dropout occurrence period; and a dropout compensation circuit that compensates for dropout by replacing one horizontal scanning section in response to the dropout detection signal. a detection means for detecting a period in which an address signal recorded at a predetermined position is included with respect to a synchronization signal included in a reproduced signal and generating an address section detection signal over the detection period; and an address section detection signal. The present invention is characterized by comprising gate means for blocking the supply of the dropout detection signal to the dropout compensation circuit only when the dropout detection signal exists.
［発明の作用］
本発明による記録情報再生装置においては、ア
ドレス信号区間においてドロツプアウトが発生し
た場合には、少なくとも発生期間に亘つてドロツ
プアウトの補償動作を停止せしめる。[Operation of the Invention] In the recorded information reproducing apparatus according to the present invention, when a dropout occurs in an address signal section, the dropout compensation operation is stopped for at least the period during which the dropout occurs.
実施例
以下、本発明の実施例を図に基づいて詳細に説
明する。Embodiments Hereinafter, embodiments of the present invention will be described in detail based on the drawings.
図は本発明の一実施例を示す概略ブロツク図で
あり、アドレス信号を含む再生RF信号は復調器
１により復調されてアンプ２において増幅後、ド
ロツプアウト補償のための切換回路３へ印加され
る。また、再生RF信号は1H遅延回路４に入力さ
れて1Hだけ遅延され復調器５により復調後、ア
ンプ６にて増幅されて先の切換回路３へ入力され
ると共に、直接ドロツプアウト検出回路７にも供
給される。ドロツプアウト検出回路７は、再生
RF信号中のドロツプアウトを検出して少なくと
もドロツプアウト発生期間中に亘つて高レベルの
ドロツプアウト検出信号を発生する。このドロツ
プアウト検出信号は２入力アンドゲート８の１入
力となる。このアンドゲート８の出力は先の切換
回路３の切換制御信号となる。 The figure is a schematic block diagram showing an embodiment of the present invention. A reproduced RF signal including an address signal is demodulated by a demodulator 1, amplified by an amplifier 2, and then applied to a switching circuit 3 for dropout compensation. In addition, the reproduced RF signal is input to the 1H delay circuit 4, delayed by 1H, demodulated by the demodulator 5, amplified by the amplifier 6, inputted to the switching circuit 3, and also directly to the dropout detection circuit 7. Supplied. The dropout detection circuit 7
A dropout in the RF signal is detected and a high level dropout detection signal is generated at least during the period during which the dropout occurs. This dropout detection signal becomes one input of a two-input AND gate 8. The output of this AND gate 8 becomes a switching control signal for the switching circuit 3 described above.
切換回路３の出力はそのままビデオ信号出力と
なると共に、LPF９、アンプ１０及びペデスタ
ルクランプ回路１１を経て同期分離回路１２及び
アドレス分離回路１３へ入力される。同期分離回
路１２の同期分離出力からアドレス信号挿入区間
を検出して低レベルの検出信号を発生するアドレ
ス区間検出回路１４が設けられており、アドレス
分離回路１３においてこの検出信号の存在期間中
クランプ出力のアドレス信号がゲートされて分離
導出されるものである。ここで、アドレス信号は
同期信号中の例えば垂直ブランキング期間のある
一定区間内に挿入されているものであるから、ア
ドレス区間検出回路１４においては、垂直同期信
号の初期タイミングを検出してそれから一定時間
遅延して所定幅の検出信号を発生する構成となつ
ている。そして、このアドレス区間検出回路１４
の出力であるアドレス区間検出信号は２入力アン
ドゲート８の他入力となる。 The output of the switching circuit 3 becomes a video signal output as it is, and is inputted to a sync separation circuit 12 and an address separation circuit 13 via an LPF 9, an amplifier 10, and a pedestal clamp circuit 11. An address section detection circuit 14 is provided which detects an address signal insertion section from the synchronization separation output of the synchronization separation circuit 12 and generates a low-level detection signal.The address separation circuit 13 outputs a clamp output during the existence period of this detection signal. address signals are gated and separately derived. Here, since the address signal is inserted within a certain section of the synchronization signal, for example, a vertical blanking period, the address section detection circuit 14 detects the initial timing of the vertical synchronization signal and then The configuration is such that a detection signal of a predetermined width is generated with a time delay. Then, this address interval detection circuit 14
The address section detection signal which is the output of is the other input of the two-input AND gate 8.
かかる構成において、ドロツプアウト現象のな
い通常動作状態では、ドロツプアウト検出信号は
低レベルであり、またアドレス区間検出信号は高
レベル又は低レベルとなつているため、アンドゲ
ート８の出力は低レベルであるから、このとき切
換回路３はアンプ２の出力を選択するように制御
されるものとすると、正規のビデオ信号、同期信
号及びアドレス信号が出力されることになる。 In such a configuration, in a normal operating state without a dropout phenomenon, the dropout detection signal is at a low level, and the address section detection signal is at a high or low level, so the output of the AND gate 8 is at a low level. At this time, if the switching circuit 3 is controlled to select the output of the amplifier 2, a regular video signal, synchronization signal, and address signal will be output.
次に、アドレス区間外にドロツプアウトが生じ
れば、ドロツプアウト検出信号は高レベルに遷移
し、そしてアドレス区間検出信号は高レベルのも
のであるから、アンドゲート８の出力は高レベル
となり、切換回路３はアンプ６の出力を選択して
1H遅延した信号が出力されドロツプアウト補償
がなされる。 Next, if a dropout occurs outside the address interval, the dropout detection signal transitions to a high level, and since the address interval detection signal is at a high level, the output of the AND gate 8 becomes a high level, and the switching circuit 3 selects the output of amplifier 6.
A signal delayed by 1H is output and dropout compensation is performed.
更に、アドレス区間では、アドレス区間検出信
号が低レベルに遷移するから、アドレス区間でド
ロツプアウトが生じてもアンドゲート８の出力は
低レベルなつて切換回路３はアンプ２の出力を選
択し、もつてドロツプアウト補償動作はなされな
いことになる。よつて、アドレス区間には誤つた
アドレス情報等が置換されることがなくなつて好
都合である。 Furthermore, since the address interval detection signal transitions to low level in the address interval, even if a dropout occurs in the address interval, the output of the AND gate 8 will be at a low level, and the switching circuit 3 will select the output of the amplifier 2. No dropout compensation operation will be performed. Therefore, it is advantageous that erroneous address information or the like is not replaced in the address section.
ところで、アドレス区間でドロツプアウトがあ
ると、データの一部が破壊されることになるが、
一般に、ビデオデイスクシステムにおけるドロツ
プアウトは短いので、このドロツプアウトに対し
て補償を行なうと、破壊された部分よりも長い区
間に亘つて信号の置換が行なわれてしまうことに
なる。この場合、アドレス信号は1H前のデータ
と相関性がなく、データの破壊をさらに拡大する
ことになり、符号誤り訂正の能力を越え、データ
を読めない確率が増すことになる。 By the way, if there is a dropout in the address area, part of the data will be destroyed.
In general, dropouts in video disc systems are short, so if compensation is made for this dropout, the signal will be replaced over an area longer than the destroyed portion. In this case, the address signal has no correlation with the data from 1H before, and the data destruction will further expand, exceeding the code error correction ability, and increasing the probability that the data cannot be read.
すなわち、ビデオ信号に関してはライン相関が
あるので1H前の信号との置換によるドロツプア
ウト補償が可能であるが、アドレス信号の場合に
は、補償の有無に拘らずデータが破壊されること
になるが、ドロツプアウト補償を行なわない方が
破壊の程度は非常に少なく、符号誤り訂正能力の
範囲内となる確率が高くなり、ドロツプアウトに
より破壊されたデータを符号誤り訂正で補償でき
るので、アドレス区間ではドロツプアウトの補償
動作を禁止することにより、情報検索の誤検索を
未然に防止できるのである。 In other words, since there is a line correlation for video signals, it is possible to compensate for dropouts by replacing the signal with a signal from 1H earlier, but in the case of address signals, data will be destroyed regardless of whether compensation is used or not. If dropout compensation is not performed, the degree of destruction will be much smaller, and the probability that it will be within the code error correction capability will be higher. Data destroyed by dropout can be compensated for by code error correction, so dropout compensation is not required in the address area. By prohibiting the operation, erroneous information searches can be prevented.
尚、図に示したブロツク図は単なる一例を示す
に過ぎず、種々の改変が可能であることは勿論で
ある。 It should be noted that the block diagram shown in the figure merely shows an example, and it goes without saying that various modifications can be made.
発明の効果
以上説明したように、本発明による記録情報再
生装置においては、アドレス信号区間においてド
ロツプアウトが発生した場合には、少なくともそ
の発生期間に亘つてドロツプアウトの補償動作を
停止せしめる構成となつていることにより、アド
レス区間のドロツプアウトについては相関のない
アドレス情報と置換することがないため、情報検
索の誤検索を未然に防止できるのである。Effects of the Invention As explained above, in the recorded information reproducing apparatus according to the present invention, when a dropout occurs in an address signal section, the dropout compensation operation is stopped for at least the period during which the dropout occurs. As a result, drop-outs in address ranges are not replaced with uncorrelated address information, and erroneous information searches can be prevented.
図は本発明の一実施例を示すブロツク図であ
る。
主要部分の符号の説明、３……信号切換回路、
７……ドロツプアウト検出回路、８……アンドゲ
ート、１４……アドレス区間検出回路。
The figure is a block diagram showing one embodiment of the present invention. Explanation of symbols of main parts, 3...Signal switching circuit,
7... Dropout detection circuit, 8... AND gate, 14... Address section detection circuit.
Claims (1)
キング期間内の１部のアドレス挿入区間に含む記
録ビデオフオーマツト信号の再生信号におけるド
ロツプアウトを検出して少なくともドロツプアウ
ト発生期間に亘つてドロツプアウト検出信号を発
生するドロツプアウト検出回路と、前記ドロツプ
アウト検出信号に応じて１水平走査区間の置換に
よつてドロツプアウト補償をなすドロツプアウト
補償回路とを有する記録情報再生装置であつて、
前記再生信号に含まれる同期信号に対して所定の
位置に記録されるアドレス信号の含まれる期間を
検出してその検出期間に亘つてアドレス区間検出
信号を発生する検出手段と、前記アドレス区間検
出信号の存在時にのみ前記ドロツプアウト検出信
号の前記ドロツプアウト補償回路への供給を阻止
するゲート手段とを備えたことを特徴とする記録
情報再生装置。1. Detecting a dropout in a playback signal of a recorded video format signal that includes an address signal for information retrieval in a part of the address insertion section within the vertical blanking period, and generating a dropout detection signal over at least the dropout occurrence period. A recorded information reproducing device comprising a dropout detection circuit and a dropout compensation circuit that performs dropout compensation by replacing one horizontal scanning section according to the dropout detection signal,
detection means for detecting a period in which an address signal recorded at a predetermined position is included with respect to a synchronization signal included in the reproduction signal and generating an address section detection signal over the detection period; and the address section detection signal. 1. A recorded information reproducing apparatus comprising: gate means for blocking supply of the dropout detection signal to the dropout compensation circuit only when the dropout detection signal exists.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP34405989A JPH02216675A (en) | 1989-12-28 | 1989-12-28 | Reproducing device for recording information including address signal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP34405989A JPH02216675A (en) | 1989-12-28 | 1989-12-28 | Reproducing device for recording information including address signal |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14421079A Division JPS5668973A (en) | 1979-11-07 | 1979-11-07 | Reproducing device for record information containing address signal |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02216675A JPH02216675A (en) | 1990-08-29 |
| JPH0526274B2 true JPH0526274B2 (en) | 1993-04-15 |
Family
ID=18366338
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP34405989A Granted JPH02216675A (en) | 1989-12-28 | 1989-12-28 | Reproducing device for recording information including address signal |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02216675A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5121727A (en) * | 1974-08-17 | 1976-02-21 | Teac Corp | |
| JPS5335512A (en) * | 1976-09-13 | 1978-04-03 | Sanyo Electric Co Ltd | Drop-out compensating circuit |
| JPS5486313A (en) * | 1977-12-21 | 1979-07-09 | Toshiba Corp | Error detecting system |
| JPS54144210A (en) * | 1978-04-28 | 1979-11-10 | Silver Seiko | Driver for type bar |
-
1989
- 1989-12-28 JP JP34405989A patent/JPH02216675A/en active Granted
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5121727A (en) * | 1974-08-17 | 1976-02-21 | Teac Corp | |
| JPS5335512A (en) * | 1976-09-13 | 1978-04-03 | Sanyo Electric Co Ltd | Drop-out compensating circuit |
| JPS5486313A (en) * | 1977-12-21 | 1979-07-09 | Toshiba Corp | Error detecting system |
| JPS54144210A (en) * | 1978-04-28 | 1979-11-10 | Silver Seiko | Driver for type bar |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02216675A (en) | 1990-08-29 |
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