JPS63253505A - Magnetic recorder - Google Patents
Magnetic recorderInfo
- Publication number
- JPS63253505A JPS63253505A JP8852587A JP8852587A JPS63253505A JP S63253505 A JPS63253505 A JP S63253505A JP 8852587 A JP8852587 A JP 8852587A JP 8852587 A JP8852587 A JP 8852587A JP S63253505 A JPS63253505 A JP S63253505A
- Authority
- JP
- Japan
- Prior art keywords
- recording
- signal
- erasing
- head
- circuit
- 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
- 230000010355 oscillation Effects 0.000 claims abstract description 22
- 238000001514 detection method Methods 0.000 claims description 8
- 238000010586 diagram Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 230000003111 delayed effect Effects 0.000 description 1
Landscapes
- Signal Processing Not Specific To The Method Of Recording And Reproducing (AREA)
- Television Signal Processing For Recording (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は4個のヘッドを順次切換えて記録する磁気記録
装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a magnetic recording device that records data by sequentially switching four heads.
従来の技術
この種の磁気記録装置としてはビデオテープレコーダが
ある。第4図は従来のごデオテープレコーダの要部の構
成を示し、第5図はその要部の波形図を示す。第4図に
おいて、記録制御回路1が記録開始の指令Aを受けると
、一定時間だけ遅延させたタイミングt1で信号D−R
FCが4つの発振回路21.22.23.24に出力さ
れる。2. Description of the Related Art Video tape recorders are examples of magnetic recording devices of this type. FIG. 4 shows the configuration of the main parts of a conventional video tape recorder, and FIG. 5 shows a waveform diagram of the main parts. In FIG. 4, when the recording control circuit 1 receives a command A to start recording, a signal D-R is sent at a timing t1 delayed by a certain period of time.
FC is output to four oscillation circuits 21, 22, 23, and 24.
信号D−RFCの印加された4つの発振回路21〜24
は、記録ヘッドスイッチング回路3から順に出力される
スイッチング信@swi〜SW4の期間に順に発振し、
回転する上シリンダ4に取り付けられたR1記録ヘッド
51、L1記録ヘッド52、R2記録ヘッド53、L2
記録ヘッド54に記録電流を順に供給する。次に記録制
御回路1が記録終了の指令Bを受けると、タイミングt
2に信@D−RECが止められ、発振回路21〜24の
発振が止まり、記録が終了する。なお上シリンダ4に取
り付けられたフライングイレースヘッド〔以下、FEヘ
ッドと称す〕6には、前記信号D−RFCの期間だけ発
振する発振回路7の信号が印加されており、FEヘッド
7には消去電流がタイミングt1〜t2にわたりて常時
供給されている。Four oscillation circuits 21 to 24 to which signal D-RFC is applied
oscillate in order during the period of switching signals @swi to SW4 sequentially output from the recording head switching circuit 3,
R1 recording head 51, L1 recording head 52, R2 recording head 53, L2 attached to the rotating upper cylinder 4
A recording current is sequentially supplied to the recording head 54. Next, when the recording control circuit 1 receives a command B to end recording, the timing t
2, the signal @D-REC is stopped, the oscillations of the oscillation circuits 21 to 24 are stopped, and recording is completed. Note that a signal from an oscillation circuit 7 that oscillates only during the period of the signal D-RFC is applied to a flying erase head (hereinafter referred to as FE head) 6 attached to the upper cylinder 4; Current is constantly supplied from timing t1 to timing t2.
発明が解決しようとする問題点
R1,Ll、R2,12記録ヘツド51〜54とFEヘ
ッド6とは上シリンダ4に位置をずらせて取り付けられ
ているにもかかわらず、上記のような従来の構成では記
録と消去が同時に開始し、終了しているため、第6図に
示すようにR1゜Ll、R2,L2記録ヘッド51〜5
4によるトラックR1,Ll、R2,L2に対して記録
開始時点では重ね書き部分aが発生し、記録終了時点で
は未記録部分すが発生する。Problems to be Solved by the Invention Although the R1, Ll, R2, 12 recording heads 51 to 54 and the FE head 6 are attached to the upper cylinder 4 with their positions shifted, the above-mentioned conventional configuration Since recording and erasing start and end at the same time, as shown in FIG.
For the tracks R1, Ll, R2, and L2 of 4, an overwritten portion a occurs at the start of recording, and an unrecorded portion a occurs at the end of recording.
さらに、FEヘッド6の幅が4/3トラックあるため、
記録σa始のトラックより前のトラックの一部や、記録
終了のトラックより後のトラックの一部をも消去してし
まうという問題がある。Furthermore, since the width of the FE head 6 is 4/3 track,
There is a problem in that a part of the track before the track at the beginning of recording σa and a part of the track after the track at the end of recording are also erased.
本発明は記録開始部分での重ねIきによるノイズの発生
や、記録終了部分での未記録部分の発生をなくすること
ができる記録再生装置を提供することを目的とする。SUMMARY OF THE INVENTION An object of the present invention is to provide a recording/reproducing apparatus that can eliminate the occurrence of noise due to overlapping I at the recording start portion and the occurrence of unrecorded portions at the recording end portion.
問題点を解決するための手段
本発明の記録再生装置は、消去ヘッドと第1〜第4の記
録ヘッドとを回転シリンダに取付けて、記録ヘッドスイ
ッチング回路から出力される第1〜第4のスイッチング
信号にしたがって1トラックごとに第1〜第4の記録ヘ
ッドを順次切換えて映像信号を記録し、第1〜第4の記
録ヘッドで記録された4トラックを前記消去ヘッドが3
回転で消去するよう構成するとともに、記録開始時には
前記映像信号の垂直同期信号中にステップ信号を発生し
て、記録終了時には前記垂直同期信号中に前記ステップ
信号をオフする第1の記録制御部と、前記ステップ信号
の検出後の第1のスイッチング信号のタイミングに第1
の記録ヘッドからの記録実行を指示し、前記ステップ信
号のオフの検出後の第1の記録ヘッドによる記録実行の
直前に記録終了を指示する第2の記録制御回路と、前記
ステップ信号の検出後の第4のスイッチング信号のタイ
ミングに消去ヘッドに消去の開始を指示し、ステップ信
号のオフの検出後の第4のスイッチング信号の直前に消
去ヘッドに消去の終了を指示する発振制御回路とを設け
たことを特徴とする。Means for Solving the Problems The recording and reproducing apparatus of the present invention has an erasing head and first to fourth recording heads mounted on a rotating cylinder, and the first to fourth switching output from a recording head switching circuit. The video signal is recorded by sequentially switching the first to fourth recording heads for each track according to the signal, and the erasing head erases the four tracks recorded by the first to fourth recording heads.
a first recording control unit configured to erase by rotation, generates a step signal during the vertical synchronization signal of the video signal at the start of recording, and turns off the step signal during the vertical synchronization signal at the end of recording; , a first switching signal at the timing of the first switching signal after the step signal is detected.
a second recording control circuit that instructs to execute recording from the first recording head and instructs to end recording immediately before the first recording head starts recording after detection of off of the step signal; and after detection of the step signal; and an oscillation control circuit that instructs the erasing head to start erasing at the timing of the fourth switching signal, and instructs the erasing head to end erasing immediately before the fourth switching signal after detection of off of the step signal. It is characterized by:
作用
この構成によると、第1〜第4の記録ヘッドをR1,L
’1.R2,L2記録ヘッドとした場合、記録は必ずR
1記録ヘッドから始められてL2記録ヘッドで終わり、
消去ヘッドはR1記録ヘッドが記録すべきトラックより
消去を始めてL2記録ヘッドが記録すべきトラックにて
消去を終えることとなり、これにより記録開始時には実
際の記録が始められるトラックから消去が始まり、終了
時には実際の記録が終えられるトラックで消去を終わら
せることができる。Operation According to this configuration, the first to fourth recording heads are connected to R1, L.
'1. When using R2, L2 recording heads, recording is always performed with R2 and L2 recording heads.
It starts with the 1 recording head and ends with the L2 recording head,
The erasing head starts erasing from the track where the R1 recording head should record and finishes erasing at the track where the L2 recording head should record, so that when recording starts, erasing starts from the track where actual recording starts, and when it ends, Erasing can be completed on the track where the actual recording ends.
実#i例
以下、本発明の一実施例を第1図〜第3図に基づいて説
明する。なお、従来例を示す第4図と同様の作用をなす
ものには同一符号を付けて説明する。ACTUAL EXAMPLE #i Hereinafter, one embodiment of the present invention will be described based on FIGS. 1 to 3. Components having the same functions as those in FIG. 4 showing the conventional example will be described with the same reference numerals.
第1図は本発明の磁気記録装置を示し、第1の記録制御
回路8が記録開始の指令Aを受けると、記録すべき映像
信号の垂直同期信号Vの期間中に第1の信号D−REC
1を出力する。この第1の信号D−REC1を検出した
第2の記録1lIIJ111回路9は記録ヘッドスイッ
チング回路3から出力されるスイッチング信号SW1の
立上りと同時に第2の信号D−RFC2を4つのyl振
回路2t 、 22 。FIG. 1 shows a magnetic recording apparatus of the present invention, in which when a first recording control circuit 8 receives a command A to start recording, a first signal D- REC
Outputs 1. The second recording 1lIIJ111 circuit 9 that detected this first signal D-REC1 sends the second signal D-RFC2 to the four yl oscillator circuits 2t, at the same time as the switching signal SW1 outputted from the recording head switching circuit 3 rises. 22.
23.24に出力する。この第2の信号D−REC2の
印加された4つの発振回路21〜24は、記録ヘッドス
イッチング回路3から順に出力されるスイッチング信号
SW1〜SW4の期間に順に発振し、回転する上シリン
ダ4に取り付けられたR1記録ヘッド51、[1記録ヘ
ツド52、R2記録ヘッド51、L2記録ヘッド54に
記録電流を順に供給する。前記第1の信号D−REC1
は発振1!1lJ11]回路10にも印加されており、
この第1の信号[)−REClを検出した発振制御回路
10は、第1の信号D−REC1の立上りを検出した債
のスイッチング信号SW4の立上りを検出したタイミン
グに第3の信号FE−ONを発振回路7に出力し、発振
回路7は第3の信号FE−ONが印加されると発振を始
めて、上シリンダ4に取り付けられたFEヘッド6に消
去電流が供給される。Output on 23.24. The four oscillation circuits 21 to 24 to which the second signal D-REC2 is applied sequentially oscillate during the period of the switching signals SW1 to SW4 sequentially output from the recording head switching circuit 3, and are attached to the rotating upper cylinder 4. A recording current is sequentially supplied to the R1 recording head 51, the [1 recording head 52, the R2 recording head 51, and the L2 recording head 54 that have been installed. Said first signal D-REC1
is also applied to the oscillation 1!1lJ11] circuit 10,
The oscillation control circuit 10 that has detected the first signal [)-REC1 outputs the third signal FE-ON at the timing when it detects the rising edge of the switching signal SW4 that has detected the rising edge of the first signal D-REC1. The oscillation circuit 7 starts oscillating when the third signal FE-ON is applied, and the erase current is supplied to the FE head 6 attached to the upper cylinder 4.
第1の記録制御回路8が記81!了の指令Bを受は付け
ると、記録中の映像信号の垂直同期信号の期間中に第1
の信号D−REC1を止める。第1の信号0−RECl
がなくなると、第2の記録制御回路9はスイッチング信
号SW1の立上りと同時に第2の信号D−REC2を止
め、これによって発振回路21〜24の発振が停止して
記録が終了する。第1の信号D−REC1が前述のよう
になくなると、発振制御回路7はスイッチング信号SW
4の立上りと同時に第3の信号FE−ONを止め、これ
によって発振回路7の発振が停止して消去が終了する。The first recording control circuit 8 is 81! When the completion command B is accepted, the first
The signal D-REC1 is stopped. First signal 0-RECl
When the second recording control circuit 9 stops the second signal D-REC2 at the same time as the switching signal SW1 rises, the oscillation of the oscillation circuits 21 to 24 stops and the recording ends. When the first signal D-REC1 disappears as described above, the oscillation control circuit 7 outputs the switching signal SW
The third signal FE-ON is stopped at the same time as the signal 4 rises, whereby the oscillation of the oscillation circuit 7 is stopped and erasing is completed.
なお、第3図は記録トラックと消去トラックの関係を示
し、R1,Ll、R2,L2記録ヘッド51〜54によ
って記録された4つのトラックをFEヘッド6が3回転
で消去していることがわかる。ただし、これは従来例に
おいても同様である。Note that FIG. 3 shows the relationship between recording tracks and erased tracks, and it can be seen that the FE head 6 erases four tracks recorded by the R1, Ll, R2, and L2 recording heads 51 to 54 in three rotations. . However, this also applies to the conventional example.
このように、記録開始時にはR1記録ヘッド51より記
録が始められ、記録終了時にはし2記録ヘツド54で終
わり、消去はR1記録ヘッド51で記録が始められるト
ラックからあらかじめ消去が始まり、L2記録ヘッド5
4で記録が終えられるトラックを消去した時点で消去を
終えるため、記録開始部分での重ね出きによるノイズの
発生や、記録終了部分での未記録部分の発生を防ぐこと
ができる。In this way, when recording starts, recording is started from the R1 recording head 51, and when recording ends, it ends at the second recording head 54, and erasing starts in advance from the track where recording is started by the R1 recording head 51, and from the L2 recording head 54.
Since the erasing ends when the track on which recording ends in step 4 is erased, it is possible to prevent the occurrence of noise due to overlapping in the recording start part and the occurrence of unrecorded parts in the recording end part.
発明の効果
以上のように本発明によれば、記録開始時には前記映像
信号の垂直同期信号中に、ステップ信号を発生して、記
録終了時には前記垂直同期信号中に前記ステップ信号を
オフする第1の記録vJ御部と、前記ステップ信号の検
出後の第1のスイッチング信号のタイミングに第1の記
録ヘッドからの記録実行を指示し、前記ステップ信号の
オフの検出後の第1の記録ヘッドによる記録実行の直前
に記録終了を指示する第2の記録制御回路と、前記ステ
ップ信号の検出後の第4のスイッチング信号のタイミン
グに消去ヘッドに消去の開始を指示し、ステップ信号の
オフの検出後の第4のスイッチング信りの直前に消去ヘ
ッドに消去の終了を指示する発振1!ill 1111
回路とを設けたため、記録開始時には記録が始められる
トラックから消去を開始して、記録終了時には記録が終
えられるトラックで消去を終了し、記録開始部分での重
ね出きによるノイズの発生や、記録終了部分での未記録
部分の発生を防ぐことができるといった、すぐれた効果
を得ることができるものである。Effects of the Invention As described above, according to the present invention, a step signal is generated during the vertical synchronization signal of the video signal at the start of recording, and the step signal is turned off during the vertical synchronization signal at the end of recording. a recording VJ control unit, which instructs the first recording head to execute recording at the timing of the first switching signal after the detection of the step signal, and by the first recording head after the detection of the off-state of the step signal. a second recording control circuit that instructs to end recording immediately before recording execution; a second recording control circuit that instructs the erasing head to start erasing at the timing of a fourth switching signal after the detection of the step signal; and after detecting that the step signal is turned off; Just before the fourth switching signal, oscillation 1! instructs the erasing head to finish erasing. ill 1111
Since the circuit is equipped with a circuit, when recording starts, erasing starts from the track where recording starts, and when recording ends, erasing ends at the track where recording can be finished. It is possible to obtain excellent effects such as being able to prevent the occurrence of unrecorded portions at the end portions.
第1図は本発明の磁気記録装置の一実施例のブロック図
、第2図は同装置の要部波形図、第3図は記録トラック
と消去トラックの関係を示した模式図、第4図は従来の
磁気記録装置を示すブロック図、第5図は同装置の要部
波形図、第6図は同装置におけるトラックの関係を示し
た模式図である。
21〜24.7・・・発振回路、3・・・記録ヘッドス
イッチング回路、51・・・R1記録ヘッド〔第1の記
録ヘッド〕、52・・・L1記録ヘッド〔第2の記録ヘ
ッド〕、53°・・・R2記録ヘッド〔第3の記録ヘッ
ド)、54・・・L2記録ヘッド〔第4の記録ヘッド〕
、6・・・フライングイレースヘッド〔消去ヘッド〕、
8・・・第1の記録制御回路、9・・・第2の記録制御
回路、10・・・発振制御回路、SW1〜SW4・・・
スイッチング信号(第1〜第4のスイッチング信号)
、D−RECl・・・第1の信号〔ステップ信号〕。
代理人 森 本 義 弘
第を図
5n−R1lz*へ7ド(Htth gど録ヘッド]h
−tt i2aヘッドC712th 3211 ヘy
FJs3−yz !c’1iz−ド(R3のg?u へ
−tドJ54・・・L2;?録”S、−tド【第4のV
雲ゑへ・シト16・・−フライシグイレスA−ソド(i
14五へ9ドl第2図
4E振O銘(?)
第3図
第4図FIG. 1 is a block diagram of an embodiment of the magnetic recording device of the present invention, FIG. 2 is a waveform diagram of essential parts of the device, FIG. 3 is a schematic diagram showing the relationship between recording tracks and erasing tracks, and FIG. 4 5 is a block diagram showing a conventional magnetic recording device, FIG. 5 is a waveform diagram of essential parts of the same device, and FIG. 6 is a schematic diagram showing the relationship between tracks in the same device. 21 to 24.7... Oscillation circuit, 3... Recording head switching circuit, 51... R1 recording head [first recording head], 52... L1 recording head [second recording head], 53°...R2 recording head [third recording head], 54...L2 recording head [fourth recording head]
, 6...Flying erase head [erase head],
8... First recording control circuit, 9... Second recording control circuit, 10... Oscillation control circuit, SW1 to SW4...
Switching signal (first to fourth switching signals)
, D-RECl...first signal [step signal]. Agent Yoshihiro Morimoto to Figure 5n-R1lz*7 (Htth g record head) h
-tt i2a head C712th 3211 Hey
FJs3-yz! c'1iz-do (R3's g?u to -t de J54...L2;? record"S, -t de [4th V
Kumoehe Shito 16...-Fly Shiguires A-Sodo (i
145 to 9 dollars l Fig. 2 4E O inscription (?) Fig. 3 Fig. 4
Claims (1)
ンダに取付けて、記録ヘッドスイッチング回路から出力
される第1〜第4のスイッチング信号にしたがって1ト
ラックごとに第1〜第4の記録ヘッドを順次切換えて映
像信号を記録し、第1〜第4の記録ヘッドで記録された
4トラックを前記消去ヘッドが3回転で消去するよう構
成するとともに、記録開始時には前記映像信号の垂直同
期信号中にステップ信号を発生して、記録終了時には前
記垂直同期信号中に前記ステップ信号をオフする第1の
記録制御部と、前記ステップ信号の検出後の第1のスイ
ッチング信号のタイミングに第1の記録ヘッドからの記
録実行を指示し、前記ステップ信号のオフの検出後の第
1の記録ヘッドによる記録実行の直前に記録終了を指示
する第2の記録制御回路と、前記ステップ信号の検出後
の第4のスイッチング信号のタイミングに消去ヘッドに
消去の開始を指示し、ステップ信号のオフの検出後の第
4のスイッチング信号の直前に消去ヘッドに消去の終了
を指示する発振制御回路とを設け、記録開始時には記録
が始められるトラックから消去を開始して、記録終了時
には記録が終えられるトラックで消去を終了するよう構
成した磁気記録装置。1. Attach the erasing head and the first to fourth recording heads to a rotating cylinder, and perform the first to fourth recording for each track according to the first to fourth switching signals output from the recording head switching circuit. The head is sequentially switched to record the video signal, and the erasing head is configured to erase the four tracks recorded by the first to fourth recording heads in three rotations, and when recording starts, the vertical synchronization signal of the video signal is a first recording control unit that generates a step signal during recording and turns off the step signal during the vertical synchronization signal when recording is completed; a second recording control circuit that instructs the recording head to execute recording, and instructs the first recording head to terminate recording immediately before the recording execution after detection of the off-state of the step signal; an oscillation control circuit that instructs the erasing head to start erasing at the timing of the fourth switching signal and instructs the erasing head to end erasing immediately before the fourth switching signal after detection of off of the step signal; A magnetic recording device configured to start erasing from a track where recording starts when recording starts, and end erasing from a track where recording ends when recording ends.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62088525A JP2679785B2 (en) | 1987-04-09 | 1987-04-09 | Magnetic recording device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62088525A JP2679785B2 (en) | 1987-04-09 | 1987-04-09 | Magnetic recording device |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS63253505A true JPS63253505A (en) | 1988-10-20 |
JP2679785B2 JP2679785B2 (en) | 1997-11-19 |
Family
ID=13945252
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP62088525A Expired - Lifetime JP2679785B2 (en) | 1987-04-09 | 1987-04-09 | Magnetic recording device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2679785B2 (en) |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS626404A (en) * | 1985-07-01 | 1987-01-13 | Toshiba Corp | Rotary head type magnetic recording and reproducing device |
-
1987
- 1987-04-09 JP JP62088525A patent/JP2679785B2/en not_active Expired - Lifetime
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS626404A (en) * | 1985-07-01 | 1987-01-13 | Toshiba Corp | Rotary head type magnetic recording and reproducing device |
Also Published As
Publication number | Publication date |
---|---|
JP2679785B2 (en) | 1997-11-19 |
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