JPH0366017A - Digital magnetic recording and reproducing device - Google Patents

Digital magnetic recording and reproducing device

Info

Publication number
JPH0366017A
JPH0366017A JP1201284A JP20128489A JPH0366017A JP H0366017 A JPH0366017 A JP H0366017A JP 1201284 A JP1201284 A JP 1201284A JP 20128489 A JP20128489 A JP 20128489A JP H0366017 A JPH0366017 A JP H0366017A
Authority
JP
Japan
Prior art keywords
head cleaning
circuit
recording
error
head
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
Application number
JP1201284A
Other languages
Japanese (ja)
Inventor
Haruyuki Inohana
治行 猪鼻
Shozaburo Sakaguchi
坂口 正三郎
Masahiro Kusuki
楠木 正啓
Isao Endo
功 遠藤
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Pioneer Corp
Original Assignee
Pioneer Electronic Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Pioneer Electronic Corp filed Critical Pioneer Electronic Corp
Priority to JP1201284A priority Critical patent/JPH0366017A/en
Publication of JPH0366017A publication Critical patent/JPH0366017A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE:To prevent the command of head cleaning or the automatic processing of the head cleaning from being executed in the case that there is little dirt on the head and also there is few errors in reproduced digital data by adding an error detection circuit and an error counting circuit. CONSTITUTION:The summed-up time of a summed-up timer 4 is monitored by a time measurement circuit 5. When the time fixed in advance is measured in the summed-up, the timer 4 is reset and started and also an output pulse is supplied to the error detection circuit 6 by the time measurement circuit 5. The error detection circuit 6 is started by the output pulse, and the error in the digital data which is read out by a magnetic head 1 and demodulated by a recording and reproducing circuit 2 is detected by the detection circuit 6. The number of errors detected by the detection circuit 6 is counted by an error counting circuit 7, and when the number of the errors exceeds a threshold fixed in advance, a head cleaning signal is outputted by the error counting circuit 7. And then, the display of the head cleaning or the automatic head cleaning is executed by the head cleaning signal.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 ディジタルオーディオチーブレコーダ(DAT)などの
ディジタル磁気記録・再生装置における記録・再生ヘッ
ドの汚れを検出する手段を備えるデ〔従来の技術〕 ディジタル磁気記録・再生装置において記録・再生ヘッ
ドが汚れると、記録あるいは再生されたディジタルデー
タに誤りを生じる。
[Detailed Description of the Invention] [Industrial Application Field] A digital magnetic recording/reproducing device including means for detecting dirt on a recording/reproducing head in a digital magnetic recording/reproducing device such as a digital audio recorder (DAT) [Prior Art] Digital magnetic recording device If the recording/reproducing head of a recording/reproducing device becomes dirty, errors will occur in the recorded or reproduced digital data.

このような問題を解決するため、従来は第4図に示すよ
うに、磁気ヘッドlによって記録・再生を行なった期間
中に記録・再生回路2から出力される信号に基づいて磁
気ヘッドの動作時間を累計する記録・再生時間累計タイ
マ4を設け、この累計時間が時間測定回路5に予め設定
されている時間と一致したときにヘッドクリーニングを
行なうべきことをヘッドクリーニング表示手段などによ
ってユーザに知らせることが行なわれていた。
In order to solve such problems, conventionally, as shown in FIG. 4, the operation time of the magnetic head is determined based on the signal output from the recording/reproducing circuit 2 during the period when recording/reproducing is performed by the magnetic head l. A recording/playback time cumulative timer 4 is provided to cumulatively total the recording/reproducing time, and when the cumulative time coincides with the time preset in the time measuring circuit 5, the user is notified by a head cleaning display means or the like that head cleaning should be performed. was being carried out.

なお、磁気ヘッドlによって読取られ記録・再生回路2
によってディジタル信号に再生されたデータは誤り訂正
回路3などによって誤り訂正が行なわれた後に音響再生
装置などの利用装置に送られることはいうまでもない。
Note that the recording/reproducing circuit 2 is read by the magnetic head l.
Needless to say, the data reproduced into a digital signal is subjected to error correction by the error correction circuit 3, etc., and then sent to a utilization device such as a sound reproduction device.

しかしながら、記録・再生ヘッドの汚れは使用したテー
プ自体の汚れや表面の性質などによって異なり、上記の
予め定めた時間が経過した場合であっても汚れが少なけ
れば必ずしもヘッドクリーニングを行なう必要はない。
However, the degree of contamination of the recording/reproducing head varies depending on the contamination of the used tape itself and the nature of its surface, and even if the above-mentioned predetermined time has elapsed, if there is little contamination, it is not necessarily necessary to perform head cleaning.

そこで本発明は、ヘッドの汚れに応じてヘッドクリーニ
ングを指示する表示あるいは自動的なヘッドクリーニン
グを制御するためのヘッドクリーニング信号を発生する
ようにしたディジタル磁気記録・再生装置を得ることを
目的とする。
SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a digital magnetic recording/reproducing device that generates a display instructing head cleaning or a head cleaning signal for automatically controlling head cleaning depending on the dirt on the head. .

〔課題を解決する−ための手段〕[Means for solving problems]

第11ff1図示の本発明の実施例を引用すると、記録
・再生時間を累計計時する累計タイマ4と、再生したデ
ィジタル信号の誤りの数に応じた出力を発生するエラー
検出器6と、上記累計タイマ4が所定時間を計時したと
きに上記エラー検出器6を動作させるとともに上記タイ
マをリセットスタートさせる記録・再生時間判定手段4
.5と、このときのエラー検出器6の出力が予め定めた
値を超えたときにヘッドクリーニング信号を出力するエ
ラー計数手段7とをディジタル磁気記録・再生装置に設
けた。
Referring to the embodiment of the present invention shown in FIG. recording/reproduction time determining means 4 for operating the error detector 6 and resetting and starting the timer when the timer 4 has counted a predetermined time;
.. 5 and an error counting means 7 for outputting a head cleaning signal when the output of the error detector 6 exceeds a predetermined value.

〔作 用〕[For production]

予め定めたヘッドクリーニング時期が到来したときでも
、ヘッドの汚れが少なく再生ディジタルデータの誤りが
少ない場合にはヘッドクリーニングの指示あるいは自動
処理を行わないようにすることができる。
Even when the predetermined head cleaning time has arrived, if the head is less contaminated and the reproduced digital data has fewer errors, it is possible to prevent head cleaning from being instructed or from being automatically processed.

〔実施例〕〔Example〕

第1図は上述のように本発明の実施例を示すもので、第
2図の動作説明図を引用しながら説明する。
As mentioned above, FIG. 1 shows an embodiment of the present invention, and will be described with reference to the operational diagram of FIG. 2.

通常の再生状態では、磁気記録・再生ヘッド1によって
記録媒体から読取られたディジタルデータは記録・再生
回路2から誤り訂正回路3に送られて読取ったディジタ
ルデータの誤りを訂正した後、図示しない音響再生装置
などに送られる。なお、記録媒体に記録するディジタル
データも上記記録・再生回路2に供給されて記録・再生
へ、ド1によって記録が行なわれることはいうまでもな
い。
In normal playback conditions, digital data read from the recording medium by the magnetic recording/playback head 1 is sent from the recording/playback circuit 2 to the error correction circuit 3, where errors in the read digital data are corrected. Sent to a playback device, etc. It goes without saying that the digital data to be recorded on the recording medium is also supplied to the recording/reproducing circuit 2 and is recorded/reproduced in response to the dot 1.

記録・再生を行なっている期間中この記録・再生回路1
からの出力によって記録・再生時間累計タイマ4は計時
を行い、縦軸を累計時間にとった第2図(alに示すよ
うに記録・再生時間tを累計する。なお、この図では始
めの状態、すなわち図の左端において既に累計された時
間toが累計タイマにセットされていたものとして示し
てあり、記録・再生が開始されるとこの累計タイマの値
は図示のように逐次増加する。
This recording/playback circuit 1 during recording/playback.
The recording/playback time cumulative timer 4 measures time based on the output from That is, at the left end of the figure, the cumulative time to has already been set in the cumulative timer, and when recording/reproduction is started, the value of the cumulative timer increases successively as shown.

時間測定回路5はこの累計タイマ4の累計時間を監視し
て予め定めた時?BITが累計計時されると上記累計タ
イマ4をリセット・スタートさせるとともに第2図(b
)に示す出力パルスをエラー検出回路6に供給する。仮
に連続して記録・再生が行われていれば、(a)図の第
2の区間に例示したように上記の予め定めた時間Tに相
当する時間ごとに時間測定回路5からこの出力パルスが
出力される。
The time measurement circuit 5 monitors the cumulative time of the cumulative timer 4 and determines when a predetermined time is reached. When the BIT is cumulatively counted, the cumulative timer 4 is reset and started, and the timer shown in FIG.
) is supplied to the error detection circuit 6. If recording and playback were to be performed continuously, (a) this output pulse would be output from the time measurement circuit 5 at every time corresponding to the predetermined time T, as illustrated in the second section of the figure. Output.

この出力パルスによって上記エラー検出回路6は起動し
、磁気ヘッド1によって読出されて上記記録・再生回路
2によって復調されたディジタルデータの誤りを検出す
る。
The error detection circuit 6 is activated by this output pulse, and detects errors in the digital data read by the magnetic head 1 and demodulated by the recording/reproducing circuit 2.

エラー計数回路7はこのディジタルエラー検出回路6に
よって検出されたエラーの数kを第2図(11,1に示
すように計数し、そのエラーの数が予め定めた閾値Kを
超えると同図(d)に示したヘッドクリーニング信号を
出力する。
The error counting circuit 7 counts the number k of errors detected by the digital error detection circuit 6 as shown in FIG. Output the head cleaning signal shown in d).

このヘッドクリーニング信号によって、磁気記録・再生
装置がヘッドクリーニング表示手段を備えている場合に
はヘッドクリーニングを行なうべきことを示すヘッドク
リーニング表示を行わせ、また磁気記録・再生装置が自
動的にヘッドクリーニングを行なう自動ヘッドクリーニ
ング手段を備えている場合にはこのヘッドクリーニング
信号によって自動的にヘッドクリーニングを行なわせる
ことができる。
This head cleaning signal causes a head cleaning display indicating that head cleaning should be performed if the magnetic recording/reproducing device is equipped with a head cleaning display means, and also causes the magnetic recording/reproducing device to automatically perform head cleaning. If an automatic head cleaning means is provided, the head cleaning signal can be used to automatically perform the head cleaning.

第3図は本発明による処理の実施例を示すフロ−チャー
トであり、記録・再生装置のすべての動作モード中この
ルーチンが実行される。
FIG. 3 is a flowchart illustrating an embodiment of the process according to the present invention, and this routine is executed during all operating modes of the recording/reproducing apparatus.

ステップ■では累計タイマ4で計時された記録・再生時
間tを時間測定回路5で予め定めた時間Tと比較してT
<tになるまではこのステップを繰返すが、Titにな
れば次のステップ■に移ってこの記録・再生装置が再生
状態にあるか否かをチエツクし、例えば停止や記録状態
にあって再生状態でなければ、このステップを繰返して
再生状態になるのを待つ。
In step (2), the recording/playback time t counted by the cumulative timer 4 is compared with a predetermined time T by the time measuring circuit 5.
This step is repeated until <t, but when Ti is reached, the process moves to the next step (2) and checks whether or not this recording/playback device is in the playback state. If not, repeat this step and wait for playback status.

装置が再生状態になると次のステップ■で累計タイマ4
をリセットスタートさせ、同時にエラー検出回路6を起
動してエラー計数回路7によってエラー計数を行わせ、
続くステップ■で計数されたエラーの数kを閾値にと比
較する。
When the device enters the playback state, the cumulative timer 4 is set in the next step ■.
and at the same time activate the error detection circuit 6 and cause the error counting circuit 7 to perform error counting,
In the following step (2), the number of errors counted k is compared with a threshold value.

そして、エラー数kがこの閾値により大きい場合には次
のステップ■でヘッドクリーニング信号を出力し、前述
のようにヘッドクリーニング表示あるいは自動的にヘッ
ドクリーニングを実行させる。
If the number of errors k is larger than this threshold value, a head cleaning signal is output in the next step (2), and the head cleaning is displayed or head cleaning is automatically executed as described above.

〔発明の効果〕〔Effect of the invention〕

本発明によれば、記録・再生の累計時間が予め定めたヘ
ッドクリーニング時間になった場合でも再生されたディ
ジタルデータに読取り誤りが少ない、すなわち記録・再
生ヘッドの汚れが少ない場合にはヘッドクリーニングを
指示する表示あるいは自動ヘッドクリーニングを行なわ
せないので無用な処理と時間を要しなくなるという格別
の効果が達成される。
According to the present invention, even if the cumulative recording/playback time reaches a predetermined head cleaning time, head cleaning is performed if there are few reading errors in the reproduced digital data, that is, if there is little dirt on the recording/playback head. Since no instruction display or automatic head cleaning is performed, a special effect is achieved in that unnecessary processing and time are no longer required.

【図面の簡単な説明】[Brief explanation of drawings]

第1図は本発明の実施例を示すブロック図、第2図はそ
の動作を説明するためのタイムチャート、 第3図は処理の実施例を示すフローチャート、第4図は
従来例を示すブロック図である。 実施例 第1図
Fig. 1 is a block diagram showing an embodiment of the present invention, Fig. 2 is a time chart for explaining its operation, Fig. 3 is a flow chart showing an embodiment of processing, and Fig. 4 is a block diagram showing a conventional example. It is. Example Figure 1

Claims (1)

【特許請求の範囲】 記録・再生時間を累計計時する累計タイマと、再生した
ディジタル信号の誤りの数に応じた出力を発生するエラ
ー検出器と、 上記累計タイマが所定時間を計時したときに上記エラー
検出器を動作させるとともに上記タイマをリセットスタ
ートさせる記録・再生時間判定手段と、 このときのエラー検出器の出力が予め定めた値を超えた
ときにヘッドクリーニング信号を出力するエラー計数手
段とを備えることを特徴とするディジタル磁気記録・再
生装置。
[Scope of Claims] A cumulative timer for cumulatively counting the recording/playback time; an error detector for generating an output according to the number of errors in the reproduced digital signal; Recording/playback time determining means for operating an error detector and resetting/starting the timer; and error counting means for outputting a head cleaning signal when the output of the error detector exceeds a predetermined value. A digital magnetic recording/reproducing device comprising:
JP1201284A 1989-08-04 1989-08-04 Digital magnetic recording and reproducing device Pending JPH0366017A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1201284A JPH0366017A (en) 1989-08-04 1989-08-04 Digital magnetic recording and reproducing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1201284A JPH0366017A (en) 1989-08-04 1989-08-04 Digital magnetic recording and reproducing device

Publications (1)

Publication Number Publication Date
JPH0366017A true JPH0366017A (en) 1991-03-20

Family

ID=16438421

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1201284A Pending JPH0366017A (en) 1989-08-04 1989-08-04 Digital magnetic recording and reproducing device

Country Status (1)

Country Link
JP (1) JPH0366017A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0745010A (en) * 1993-07-30 1995-02-14 Internatl Business Mach Corp <Ibm> Method and equipment for recovery of error of tape storage device
JPH0757400A (en) * 1993-07-30 1995-03-03 Internatl Business Mach Corp <Ibm> Method and equipment for recovering error of tape-storage device
US5612830A (en) * 1992-03-25 1997-03-18 International Business Machines Corporation Method and apparatus for cleaning disks upon reaching a disk drive start-stop cycle threshold
JPH09324270A (en) * 1997-01-13 1997-12-16 Shin Etsu Chem Co Ltd Vacuum treating device
US6411083B1 (en) 1998-11-10 2002-06-25 Nec Corporation Apparatus for effectively detecting foreign particles adhered to magnetic head

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5612830A (en) * 1992-03-25 1997-03-18 International Business Machines Corporation Method and apparatus for cleaning disks upon reaching a disk drive start-stop cycle threshold
JPH0745010A (en) * 1993-07-30 1995-02-14 Internatl Business Mach Corp <Ibm> Method and equipment for recovery of error of tape storage device
JPH0757400A (en) * 1993-07-30 1995-03-03 Internatl Business Mach Corp <Ibm> Method and equipment for recovering error of tape-storage device
JPH09324270A (en) * 1997-01-13 1997-12-16 Shin Etsu Chem Co Ltd Vacuum treating device
US6411083B1 (en) 1998-11-10 2002-06-25 Nec Corporation Apparatus for effectively detecting foreign particles adhered to magnetic head

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