JPS6364603A - Digital signal reproducing device - Google Patents
Digital signal reproducing deviceInfo
- Publication number
- JPS6364603A JPS6364603A JP61207866A JP20786686A JPS6364603A JP S6364603 A JPS6364603 A JP S6364603A JP 61207866 A JP61207866 A JP 61207866A JP 20786686 A JP20786686 A JP 20786686A JP S6364603 A JPS6364603 A JP S6364603A
- Authority
- JP
- Japan
- Prior art keywords
- signals
- error
- magnetic head
- magnetic
- corrected
- 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.)
- Granted
Links
- 108010076504 Protein Sorting Signals Proteins 0.000 claims 1
- 238000001514 detection method Methods 0.000 abstract description 11
- 230000000694 effects Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
Landscapes
- Television Signal Processing For Recording (AREA)
- Digital Magnetic Recording (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明はディジタル信号を多数の磁気ヘッドで再生する
装置に係り、特に１つ１つの磁気ヘッドと関係する識別
回路の符号誤り発生状態を観測する回路金有するディジ
タル信号再生装置に関する。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an apparatus for reproducing digital signals using a large number of magnetic heads, and in particular, a system for observing code error occurrence states in identification circuits related to each magnetic head. The present invention relates to a digital signal reproducing device having a circuit.
従来の複数ヘッドを用いｔディジタル信号の記録・再生
装置は特開昭５７−１２０２１５号に記載の二うに、デ
ィジタル化したテレビ信号を３チヤネルに分配し、４つ
の磁気ヘッドで記録再生するもので、多量のディジタル
信号の記録・再生忙適した構成となって贋る。しかし、
各磁気ヘッドで再生される信号の符号誤りの状態を観測
し、各磁気ヘッドに対応した識別回路の調整を容易にす
る点については配慮されていなかった。A conventional digital signal recording/reproducing device using multiple heads distributes a digital television signal into three channels and records and reproduces it using four magnetic heads, as described in Japanese Patent Laid-Open No. 57-120215. However, the configuration is not suitable for recording and reproducing large amounts of digital signals. but,
No consideration was given to observing the state of code errors in signals reproduced by each magnetic head and facilitating adjustment of the identification circuit corresponding to each magnetic head.
上記従来技術はとくに、記録する磁気ヘッドの数と回路
のチャネル数が一致していない場合、それぞれの磁気ヘ
ッドでの再生信号がどの程度の符号誤りの状態にあるか
を観察するあるいは観測する点についての配慮がなされ
ていない。The above-mentioned conventional technology is particularly concerned with observing or observing the degree of code error in the reproduction signal of each magnetic head when the number of recording magnetic heads and the number of circuit channels do not match. No consideration has been given to
通常、チャネル毎（（符号の誤り検出回路が設けられて
おり、チャネル毎には符号誤りの状態は容易に観測、観
察することが可能である。しかし、１つのチャネルの信
号は２つ以上の磁気ヘッドからの信号で構成されている
。符号誤りの発生原因の主なものはヘッドの摩耗による
テープ・ヘッド系の周波数特性の変化、ヘッドの当りの
変化、さらにはトラッキングずれ）ど各々の磁気ヘッド
に依存するものからなるので、各磁気ヘッドに対応する
誤りの状態を観測、観察して、各磁気ヘッドに対応した
等化回路（テープ・ヘッド系の周波数特性を補償する回
路）を調整する等の対策が必要がある。Usually, a code error detection circuit is provided for each channel, and the state of code errors can be easily observed for each channel. However, the signal of one channel is It consists of signals from the magnetic head.The main causes of code errors are changes in the frequency characteristics of the tape head system due to head wear, changes in head contact, and tracking deviation). Since it consists of things that depend on the head, the error status corresponding to each magnetic head is observed and the equalization circuit (circuit that compensates for the frequency characteristics of the tape head system) corresponding to each magnetic head is adjusted. Measures such as these are necessary.
本発明の目的は各チャネルで得られた誤り検出情報を利
用して各磁気ヘッド毎の誤りを取り出し、各磁気ヘッド
毎の誤り状態を羨測、観察しようとすることである。An object of the present invention is to extract errors for each magnetic head using error detection information obtained in each channel, and to estimate and observe the error state of each magnetic head.
上記目的は、各チャネルで行った誤り検出の判定結果を
各磁気ヘッド毎に再度分配するスイッチャ−を設けて、
各磁気ヘッド毎に判定結果を集めることによって、各磁
気ヘッド毎の誤り状態？観測又は観察できる。The above purpose is to provide a switcher that redistributes the judgment results of error detection performed in each channel to each magnetic head.
By collecting the judgment results for each magnetic head, it is possible to determine the error status of each magnetic head. Observable or observable.
ディジタル情報を記録する磁気ヘッドはシリンダの上に
固定して配置されており、シリンダ周期によって、各磁
気ヘッドが記録・（再生）可能な時間が設定できる。A magnetic head for recording digital information is fixedly placed on a cylinder, and the time during which each magnetic head can record and (reproduce) can be set depending on the cylinder cycle.
さらに、磁気ヘッド数とチャネル数が一致していないの
で、磁気ヘッドはチャネルを順次切り換えて記録・（再
生）する。所定の磁気ヘッドが同一のチャネルを記録（
再生）する周期は磁気ヘッド数とチャネル数の最小公倍
数から与えられる。Furthermore, since the number of magnetic heads and the number of channels do not match, the magnetic heads sequentially switch channels for recording and (reproduction). A given magnetic head records the same channel (
The reproduction period is given by the least common multiple of the number of magnetic heads and the number of channels.
この周期において、当該の磁気ヘッドで記録（再熱指定
できる。During this cycle, recording (reheating) can be specified using the relevant magnetic head.
各チャネルでは各磁気ヘッドの１シリンダ周期で記録（
再生）できる期間を複数１囚のブロックで構成し、この
１ブロツクが誤り訂正・検出の１つの単位となって−る
。In each channel, recording is performed in one cylinder period of each magnetic head (
The playback period is made up of multiple blocks, and each block serves as a unit for error correction and detection.
このため、各チャネルで得られたブロック母の誤り訂正
・検出の結果は、スイッチャ−を介して当該の磁気ヘッ
ド毎に分配可能である。各磁気ヘッド毎に誤り訂正・検
出の結果を果めて、表示すると、この表示によってどの
磁気ヘッドに誤りが多く発生しているかが判別できる。Therefore, the results of block mother error correction and detection obtained in each channel can be distributed to each magnetic head through the switcher. When the error correction/detection results are completed and displayed for each magnetic head, it can be determined from this display which magnetic head is causing the most errors.
磁気ヘッドの、取り換え、あるいは磁気ヘッドと１：１
に対応している等化回路の調整にすばやく対処できる。Replacement of magnetic head or 1:1 with magnetic head
You can quickly adjust the equalization circuit that supports this.
以下、本発明の一実施例を第１図により説明する。ｌは
従来から提案されているディジタルＶＴＲの信号口２１
ｒを示している。２は本発明による各磁気ヘッドにおけ
る符号誤りを検出２表示する九めの回路であろう
１において、テレビ信号は入力端子１−１を介してＡ／
Ｄ変換器１−２でディジタル信号に変換される。約１０
０゜ｄｂｑｓの高速なデータレートとなるので、１チヤ
ネルで記録再生することは難しく、３チヤネルに分配回
路１−３で分配する。各チャネルでは磁気テープ・ヘッ
ド系で発生する符号誤りを検出し１訂正できるように、
誤り訂正検出符号を１−４ＥＣＣ付加回路で挿入する。An embodiment of the present invention will be described below with reference to FIG. l is the signal port 21 of the digital VTR proposed in the past.
It shows r. 2 is probably the ninth circuit for detecting and displaying code errors in each magnetic head according to the present invention. In 1, the television signal is input to the A/
It is converted into a digital signal by a D converter 1-2. about 10
Since the data rate is as high as 0° dbqs, it is difficult to record and reproduce data in one channel, so the distribution circuit 1-3 distributes the data to three channels. In each channel, code errors occurring in the magnetic tape head system can be detected and corrected.
An error correction detection code is inserted by a 1-4 ECC addition circuit.
磁気ヘッドは４個がシリンダ１−７上に９０’ずつずれ
て配置され、・磁気テープ１−６はシリンダに２７０＜
″分巻付けられている。各チャネルの信号は順次４個の
磁気ヘッドＡ、Ｂ、Ｃ，Ｄによって記録される。Four magnetic heads are arranged on the cylinder 1-7, shifted by 90', and the magnetic tape 1-6 is placed on the cylinder at a distance of 270'.
The signals of each channel are sequentially recorded by four magnetic heads A, B, C, and D.
第２図は各チャネルにおける記録磁気ヘッドの割り当て
状況を示している。２７０°巻き付けてあるので、シリ
ンダ回転周期Ｔｃの７の期間Ｔ８毎に磁気ヘッドが変わ
る。FIG. 2 shows the assignment of recording magnetic heads to each channel. Since the magnetic head is wound 270 degrees, the magnetic head changes every seven periods T8 of the cylinder rotation period Tc.
磁気テープ１−７の記録パターンは各磁気ヘッドで再生
され磁気ヘッドＡ、 Ｂ、 Ｃ，Ｄに１：ＩＫ対応した
プリアンプ１−８で増幅され、さらに、磁気テープ・ヘ
ッド系の周波数特性を補償する等化回路１−９を介して
、ディジタル信号に復号する。The recorded patterns on the magnetic tapes 1-7 are reproduced by each magnetic head and amplified by preamplifiers 1-8 that support 1:IK for magnetic heads A, B, C, and D, and further compensate for the frequency characteristics of the magnetic tape head system. The signal is decoded into a digital signal via an equalizer circuit 1-9.
第２図に示すよう罠、各チャネルの信号は磁気ヘッドの
配置に対応して時間遅れがある。また、磁気テープから
の信号は時間軸の変動を伴っている。これらをタイムベ
ースコレクタニ（ＴＢＣ）１−１０で補正する。ＴＢＣ
Ｉ−１０ではさらに各磁気ヘッドからの信号をまとめて
、各チャネルの信号に再編成するスイッチャ−の機能も
有している。As shown in FIG. 2, the signals of each channel have a time delay corresponding to the arrangement of the magnetic heads. Furthermore, the signal from the magnetic tape is accompanied by fluctuations in the time axis. These are corrected using time base corrector (TBC) 1-10. T.B.C.
The I-10 also has a switcher function that collects signals from each magnetic head and reorganizes them into signals for each channel.
第３図に各チャネルがどの磁気ヘッドからの信号で構成
されているかを示す。FIG. 3 shows which magnetic head each channel is made up of.
各チャネルの信号はエラー訂正回路（ＥＣＣ） １−１
ｒｃ符号誤りが検出され、訂正可能な誤り分については
訂正が行われる。訂正され念信号は統合回路１−１２で
まとめられ、Ｄ／Ａ変換器１−１３で元のテレビ信号に
戻される。The signal of each channel is an error correction circuit (ECC) 1-1
rc code errors are detected, and correctable errors are corrected. The corrected telephony signals are combined by an integration circuit 1-12 and returned to the original television signal by a D/A converter 1-13.
誤り訂正・検出符号は所定のブロック単位のディジタル
信号に対して演算され、挿入される。ブロックの長さは
各磁気ヘッドの記録周期Ｔ１の長数分の１に設定し、誤
り訂正・検出のブロックが複数の磁気ヘッドにま念がら
々いようにする。The error correction/detection code is calculated and inserted into a digital signal in a predetermined block unit. The length of the block is set to be a fraction of the length of the recording period T1 of each magnetic head, so that the error correction/detection block can cover a plurality of magnetic heads.
各チャネルの誤り検出回路では誤りが発生してるワード
、あるいは複数１ｒ！Ａのワードを集めたサブブロック
毎に誤りの有無が誤りパルスの有・無で判定できる。The error detection circuit of each channel detects the word in which an error has occurred or multiple 1r! The presence or absence of an error can be determined for each subblock in which words of A are collected based on the presence or absence of an error pulse.
第４図に示すように、各磁気ヘッド毎に所定チャネルの
誤りパルスをスイッチャ−２−１を介して集めて、カウ
ンタ２−２−１〜２−２−４で誤りパルスを計数し、表
示器２−３−１〜２−３−４で誤り状態を表示する。表
示器は所定時間内の誤シの個数を数値で示すものや、ケ
タ数に対応して少ない時は緑、多い時は赤というように
ランプを点灯してもよい。As shown in FIG. 4, error pulses of a predetermined channel are collected for each magnetic head via a switcher 2-1, and the error pulses are counted and displayed by counters 2-2-1 to 2-2-4. The error status is displayed on devices 2-3-1 to 2-3-4. The display may be one that numerically indicates the number of incorrect entries within a predetermined period of time, or a lamp may be lit corresponding to the number of digits, such as green when the number is small and red when the number is large.
本発明によれば、各磁気ヘッド毎の誤り状態が観測でき
るので、磁気ヘッドが摩耗して取り代えの必要があるな
どの状況に対してすばやく対処でき、使いがっての良い
ディジタルＶＴＲ等のディジタル信号再生装置を提供で
きる。According to the present invention, since the error status of each magnetic head can be observed, it is possible to quickly deal with situations such as when the magnetic head is worn out and needs to be replaced. A digital signal reproducing device can be provided.
第１図は本発明の一実施例のディジタルＶＴＲの信号系
統図、第２図は各チャネルにおける磁気ヘッドへの信号
分配を示すタイムチャート、第３図はタイムベースコレ
クター後の各チャネルにおける信号状態を示すタイムチ
ャート、第４図は各磁気ヘッドにおける信号分配の状況
を示すタイムチャート。
１−２・・・Ａ／Ｄ変換器、１−４・・・ＥＣＣ付加回
路、１−９・・・等化回路、１−１１・・・ＦＣＣ回路
、２−１・・・スイッチャ−１２−２−１・・・カウン
タ、２−３−１・・・表示器、１−１３・・・Ｄ／Ａ変
換器。Fig. 1 is a signal system diagram of a digital VTR according to an embodiment of the present invention, Fig. 2 is a time chart showing signal distribution to magnetic heads in each channel, and Fig. 3 is a signal state in each channel after the time base collector. FIG. 4 is a time chart showing the status of signal distribution in each magnetic head. 1-2... A/D converter, 1-4... ECC addition circuit, 1-9... Equalization circuit, 1-11... FCC circuit, 2-1... Switcher-12 -2-1...Counter, 2-3-1...Display device, 1-13...D/A converter.
Claims (1)
、分配した信号をｎ個（ｍ≠ｎ）の磁気ヘッドで記録し
てなるディジタル信号を再生する装置において、再生デ
ィジタル信号の符号誤りを示す情報を各磁気ヘッド毎に
集計することを特徴とするディジタル信号再生装置。1. In a device that reproduces a digital signal by distributing a digital signal into m signal sequences and recording the distributed signals with n magnetic heads (m≠n), it is possible to detect code errors in the reproduced digital signal. A digital signal reproducing device characterized in that information displayed on each magnetic head is aggregated for each magnetic head.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61207866A JP2544354B2 (en) | 1986-09-05 | 1986-09-05 | Digital signal regenerator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61207866A JP2544354B2 (en) | 1986-09-05 | 1986-09-05 | Digital signal regenerator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6364603A true JPS6364603A (en) | 1988-03-23 |
| JP2544354B2 JP2544354B2 (en) | 1996-10-16 |
Family
ID=16546844
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61207866A Expired - Lifetime JP2544354B2 (en) | 1986-09-05 | 1986-09-05 | Digital signal regenerator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2544354B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63231773A (en) * | 1987-03-20 | 1988-09-27 | Victor Co Of Japan Ltd | Rotary head type digital signal recording and reproducing device |
| JPH01312798A (en) * | 1988-06-13 | 1989-12-18 | Hitachi Ltd | Digital recording and reproducing device |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57120215A (en) * | 1980-11-27 | 1982-07-27 | Bosch Gmbh Robert | Digital signal recording and/or reproducing apparatus |
| JPS62232712A (en) * | 1986-04-01 | 1987-10-13 | Sony Corp | Recording and reproducing device for digital signal |
-
1986
- 1986-09-05 JP JP61207866A patent/JP2544354B2/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57120215A (en) * | 1980-11-27 | 1982-07-27 | Bosch Gmbh Robert | Digital signal recording and/or reproducing apparatus |
| JPS62232712A (en) * | 1986-04-01 | 1987-10-13 | Sony Corp | Recording and reproducing device for digital signal |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63231773A (en) * | 1987-03-20 | 1988-09-27 | Victor Co Of Japan Ltd | Rotary head type digital signal recording and reproducing device |
| JPH01312798A (en) * | 1988-06-13 | 1989-12-18 | Hitachi Ltd | Digital recording and reproducing device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2544354B2 (en) | 1996-10-16 |
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