JP2679785B2 - Magnetic recording device - Google Patents
Magnetic recording deviceInfo
- Publication number
- JP2679785B2 JP2679785B2 JP62088525A JP8852587A JP2679785B2 JP 2679785 B2 JP2679785 B2 JP 2679785B2 JP 62088525 A JP62088525 A JP 62088525A JP 8852587 A JP8852587 A JP 8852587A JP 2679785 B2 JP2679785 B2 JP 2679785B2
- Authority
- JP
- Japan
- Prior art keywords
- signal
- recording
- switching
- output
- erasing
- 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
Landscapes
- Signal Processing Not Specific To The Method Of Recording And Reproducing (AREA)
- Television Signal Processing For Recording (AREA)
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。
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図は従来のビ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−RE
Cが４つの発振回路21,22,23,24に出力される。信号Ｄ−
REC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、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t2に信号Ｄ−RECが止められ、発振回路2
1〜24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−REC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にわたって常時
供給されている。
発明が解決しようとする問題点
R1,L1,R2,L2記録ヘッド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,L
1,R2,L2記録ヘッド51〜54によるトラックR1,L1,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ｂが発生する。
さらに、FEヘッド６の幅が4/3トラックあるため、記
録開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
い、特に、これらはトラックの途中から発生しているた
め、一画面の途中から画像が変わり、しかも画像変更時
に重ね書きによるノイズや未記録部分が起こることによ
り非常に見苦しいもので、磁気記録装置として大きな問
題であった。
本発明は記録開始部分での重ね書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。
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
ッチング回路から順次出力される第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トラックを消去ヘッドが３
回転で消去するよう構成した磁気記録装置であって、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
スイッチング信号を入力し、かつ第１〜第４の記録ヘッ
ドにそれぞれ接続され第１〜第４のスイッチング信号に
従い発振信号を出力する第１〜第４の発振部と、消去ヘ
ッドに接続され消去発振信号を出力する消去発振部と、
映像信号の垂直同期信号と記録開始信号と記録終了信号
とを入力し、記録開始信号を入力すると次の垂直同期信
号中に第１のステップ信号をON出力し、記録終了信号を
入力すると次の垂直同期信号中に第１のステップ信号を
OFF出力する第１の記録制御回路と、第１の記録制御回
路が出力する第１のステップ信号と記録ヘッドスイッチ
ング回路が出力する第１のスイッチング信号とを入力し
て、第１〜第４の発振部に第２のステップ信号を出力
し、第１のステップ信号のON出力を検出した後、第１の
スイッチング信号のON立ち上がりのタイミングに第２の
ステップ信号をONにし、第１のステップ信号のOFF出力
を検出した後、第１のスイッチング信号のON立ち上がり
のタイミングに第２のステップ信号をOFFにする第２の
記録制御回路と、第１の記録制御回路が出力する第１の
ステップ信号と記録ヘッドスイッチング回路が出力する
第４のスイッチング信号とを入力して、消去発振部に消
去ステップ信号を出力し、第１のステップ信号のON出力
を検出した後、第４のスイッチング信号のON立ち上がり
のタイミングに消去ステップ信号をONにし、第１のステ
ップ信号のOFF出力を検出した後、第４のスイッチング
信号のON立ち上がりのタイミングに消去ステップ信号を
OFFにする発振制御部とを備え、第２の記録制御回路が
出力する第２のステップ信号のON時に第１〜第４の発振
部は発振可能状態になり第１〜第４のスイッチング信号
に従い記録をし、発振制御部の消去ステップ信号のON時
に消去発振部は発振可能状態になることを特徴とする。
作用
この構成によると、第１〜第４の記録ヘッドをR1,L1,
R2,L2記録ヘッドとした場合、映像信号の垂直同期信号
と同期して、記録は必ずR1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。
実施例
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。
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−REC1
を出力する。この第１の信号Ｄ−REC1を検出した第２の
記録制御回路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−REC2を４つの発振回路21,22,23,24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、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。前記第１の信号Ｄ−REC1
は発振制御回路10にも印加されており、この第１の信号
Ｄ−REC1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後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。
第１の記録制御回路８が記録終了の指令Ｂを受け付け
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Ｄ−REC1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SW4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。
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,L1,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。
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L2記録ヘッド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54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書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。
発明の効果
以上のように本発明によれば、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順次出力される第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トラックを消去ヘッ
ドが３回転で消去するよう構成した磁気記録装置であっ
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を入力し、かつ第１〜第４の記
録ヘッドにそれぞれ接続され第１〜第４のスイッチング
信号に従い発振信号を出力する第１第４の発振部と、消
去ヘッドに接続され消去発振信号を出力する消去発振部
と、映像信号の垂直同期信号と記録開始信号と記録終了
信号とを入力し、記録開始信号を入力すると次の垂直同
期信号中に第１のステップ信号をON出力し、記録終了信
号を入力すると次の垂直同期信号中に第１のステップ信
号をOFF出力する第１の記録制御回路と、第１の記録制
御回路が出力する第１のステップ信号と記録ヘッドスイ
ッチング回路が出力する第１のスイッチング信号とを入
力して、第１〜第４の発振部に第２のステップ信号を出
力し、第１のステップ信号のON出力を検出した後、第１
のスイッチング信号のON立ち上がりのタイミングに第２
のステップ信号をONにし、第１のステップ信号のOFF出
力を検出した後、第１のスイッチング信号のON立ち上が
りのタイミングに第２のステップ信号をOFFにする第２
の記録制御回路と、第１の記録制御回路が出力する第１
のステップ信号と記録ヘッドスイッチング回路が出力す
る第４のスイッチング信号とを入力して、消去発振部に
消去ステップ信号を出力し、第１のステップ信号のON出
力を検出した後、第４のスイッチング信号のON立ち上が
りのタイミングに消去ステップ信号をONにし、第１のス
テップ信号のOFF出力を検出した後、第４のスイッチン
グ信号のON立ち上がりのタイミングに消去ステップ信号
をOFFにする発振制御部とを備え、第２の記録制御回路
が出力する第２のステップ信号のON時に第１〜第４の発
振部は発振可能状態になり第１〜第４のスイッチング信
号に従い記録をし、発振制御部の消去ステップ信号のON
時に消去発振部は発振可能状態になることを特徴とした
ことにより、記録開始時には垂直同期信号と同期して記
録が始められるトラックの初め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の終わりで消去
を終了するので、重ね書きの指令がいつ発生しても、ト
ラックの途中すなわち一画面の途中において画像が変わ
ることがなく、しかも記録開始部分での重ね書きによる
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。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording apparatus for recording by sequentially switching four heads. 2. Description of the Related Art As a magnetic recording device of this type, there is a video tape recorder. FIG. 4 shows the structure of the main part of a conventional video tape recorder, and FIG. 5 shows the waveform diagram of the main part. In FIG. 4, when the recording control circuit 1 receives a recording start command A, a signal D-RE is generated at a timing t 1 delayed by a certain time.
C is output to the four oscillator circuits 2 1 , 2 2 , 2 3 and 2 4 . Signal D-
Four of the oscillation circuit 2 1 to 2 applied the REC 4 is, R1 recording head during the period of the switching signal SW1~SW4 mounted on the cylinder 4 to oscillate forward rotation output from the recording head switching circuit 3 sequentially 5 1 , a recording current is sequentially supplied to the L1 recording head 5 2 , the R2 recording head 5 3 , and the L2 recording head 5 4 . Next, when the recording control circuit 1 receives the recording end command B, the signal D-REC is stopped at the timing t 2 , and the oscillation circuit 2
It stops 21 to 24 of the oscillation, the recording is finished. A flying erase head [hereinafter referred to as FE head] 6 attached to the upper cylinder 4 is applied with a signal from an oscillation circuit 7 that oscillates only during the period of the signal D-REC, and the FE head 7 is erased. Current is constantly supplied from timing t 1 to timing t 2 . Problems to be Solved by the Invention Although the R1, L1, R2, L2 recording heads 5 1 to 5 4 and the FE head 6 are mounted on the upper cylinder 4 while being displaced from each other, Since the recording and erasing start and end at the same time in the configuration of R, as shown in FIG.
1, R2, L2 track by the recording head 5 1 ~5 4 R1, L1, R2, L2 overwrite portions a at the recording start point relative to occur, unrecorded portion b is generated in the recording end time. Furthermore, since the width of the FE head 6 is 4/3 tracks, a part of the track before the recording start track and a part of the track after the recording end track are erased. Since it occurs in the middle of the track, the image changes from the middle of one screen, and it is very unsightly due to noise and unrecorded parts due to overwriting when changing the image, which was a big problem as a magnetic recording device. . SUMMARY OF THE INVENTION It is an object of the present invention to provide a recording / reproducing apparatus capable of eliminating the generation of noise at the recording start portion due to overwriting and the generation of an unrecorded portion at the recording end portion. Means for Solving the Problems In the recording / reproducing apparatus of the present invention, an erasing head and first to fourth recording heads are attached to a rotary cylinder, and first to fourth switchings sequentially output from a recording head switching circuit. The video signals are recorded by sequentially switching the first to fourth recording heads for each track according to the signal, and the first to fourth recording heads are recorded.
Erases 3 tracks from 4 tracks recorded by
A magnetic recording device configured to erase by rotation, wherein first to fourth switching signals output from a recording head switching circuit are input, and the magnetic recording device is connected to the first to fourth recording heads, respectively. First to fourth oscillating units that output oscillating signals according to a fourth switching signal, an erasing oscillating unit that is connected to the erasing head and outputs an erasing oscillating signal,
When the vertical synchronizing signal, the recording start signal and the recording end signal of the video signal are input and the recording start signal is input, the first step signal is turned ON during the next vertical synchronizing signal, and when the recording end signal is input the next step The first step signal in the vertical sync signal
The first recording control circuit that outputs OFF, the first step signal that the first recording control circuit outputs, and the first switching signal that the recording head switching circuit outputs are input, and the first to fourth After outputting the second step signal to the oscillator and detecting the ON output of the first step signal, the second step signal is turned ON at the timing of the ON rising of the first switching signal, and the first step signal After detecting the OFF output of the first switching signal, the second recording control circuit that turns OFF the second step signal at the timing of the ON rising of the first switching signal, and the first step signal output by the first recording control circuit And a fourth switching signal output from the recording head switching circuit, output an erase step signal to the erase oscillator, detect the ON output of the first step signal, and then output the fourth switch. After turning on the erase step signal at the timing of the ON rising of the switching signal and detecting the OFF output of the first step signal, the erase step signal is sent at the timing of the ON rising of the fourth switching signal.
An oscillation control unit for turning off is provided, and when the second step signal output from the second recording control circuit is turned on, the first to fourth oscillating units are in an oscillating state and follow the first to fourth switching signals. It is characterized in that the erasing oscillation unit is in a state capable of oscillating when recording and erasing the erasing step signal of the oscillation control unit. Operation According to this configuration, the first to fourth recording heads R1, L1,
When using the R2 and L2 recording heads, recording is always started from the R1 recording head in synchronization with the vertical sync signal of the video signal
The recording head ends at the recording head, and the erasing head starts erasing from the track to be recorded by the R1 recording head and finishes erasing at the track to be recorded by the L2 recording head. Can start and end at the track where the actual recording ends. Embodiment An embodiment of the present invention will be described below with reference to FIGS. It should be noted that components having the same functions as those of the conventional example shown in FIG. FIG. 1 shows a magnetic recording apparatus of the present invention. When the first recording control circuit 8 receives a recording start command A, a first signal D- is supplied during a period of a vertical synchronizing signal V of a video signal to be recorded. REC1
Is output. The first signal D-REC1 second recording control circuit 9 detects the recording head switching circuit 3 is the switching signal SW1 rise simultaneously with the second signal D-REC2 4 one of the output from the oscillation circuit 2 1, Output to 2 2 , 2 3 and 2 4 . The second four oscillation circuits 21 to 24 which are applied signals D-REC2 oscillates in sequence period of the switching signal SW1~SW4 outputted from the recording head switching circuit 3 in order, on a rotating cylinder 4 R1 recording head 5 1 , L1 recording head 5 2 , R2 recording head 5 3 , L2 recording head mounted on
Supply recording current to 5 4 in order. The first signal D-REC1
Is also applied to the oscillation control circuit 10, and the oscillation control circuit 10 that has detected the first signal D-REC1 will detect the first signal D-REC1.
The third signal FE-ON is output to the oscillation circuit 7 at the timing when the rising edge of the switching signal SW4 is detected after the rising edge of REC1 is detected, and the oscillation circuit 7 oscillates when the third signal FE-ON is applied. FE attached to the upper cylinder 4
An erase current is supplied to the head 6. When the first recording control circuit 8 receives the recording end command B, the first recording control circuit 8 makes the first recording during the period of the vertical synchronizing signal of the video signal being recorded.
Stop the signal D-REC1 of. When the first signal D-REC1 is eliminated, the second recording control circuit 9 rises and stops a second signal D-REC2 simultaneously switching signals SW1, whereby the oscillation of the oscillation circuit 21 to 24 is stopped The recording is completed. When the first signal D-REC1 disappears as described above, the oscillation control circuit 7 stops the third signal FE-ON at the same time when the switching signal SW4 rises, which stops the oscillation of the oscillation circuit 7 and erases it. finish. FIG. 3 shows the relationship between the recording track and the erasing track. The FE head 6 erases four tracks recorded by the R1, L1, R2, L2 recording heads 5 1 to 5 4 in three revolutions. I understand. However, this also applies to the conventional example. In this way, at the start of recording, recording is started from the R1 recording head 5 1 , and at the end of recording it ends at the L2 recording head 5 4 .
The erasing starts from the track where recording is started by the R1 recording head 5 1 in advance, and the erasing ends when the track where recording is completed by the L2 recording head 5 4 is deleted.Therefore, noise due to overwriting at the recording start portion It is possible to prevent the occurrence of an unrecorded portion at the end of recording. As described above, according to the present invention, the erasing head and the first to fourth recording heads are attached to the rotary cylinder, and the first to fourth switching signals sequentially output from the recording head switching circuit are provided. Therefore, the video signals are recorded by sequentially switching the first to fourth recording heads for each track.
A magnetic recording device configured such that an erasing head erases four tracks recorded by a fourth recording head by three revolutions, and the first to one output from a recording head switching circuit.
It is connected to an erasing head, and a first to fourth oscillating section which inputs a fourth switching signal and is connected to each of the first to fourth recording heads and outputs an oscillation signal in accordance with the first to fourth switching signals. The erasing oscillation unit that outputs the erasing oscillation signal, the vertical synchronizing signal of the video signal, the recording start signal, and the recording ending signal are input, and when the recording start signal is input, the first step signal is turned on during the next vertical synchronizing signal. A first recording control circuit that outputs and outputs the first step signal OFF during the next vertical synchronizing signal when the recording end signal is input, and the first step signal output by the first recording control circuit and the recording head The first switching signal output from the switching circuit is input, the second step signal is output to the first to fourth oscillating units, and the ON output of the first step signal is detected.
No. 2 at the timing of ON rising of the switching signal of
Second step signal is turned off at the timing of the first rising edge of the first switching signal after detecting the OFF output of the first step signal.
Recording control circuit, and the first recording control circuit outputs the first recording control circuit.
Inputting the step signal and the fourth switching signal output from the recording head switching circuit, outputting the erase step signal to the erase oscillator and detecting the ON output of the first step signal, and then performing the fourth switching. An oscillation control unit that turns on the erase step signal at the timing of the signal's ON rise, detects the OFF output of the first step signal, and then turns off the erase step signal at the timing of the ON rise of the fourth switching signal. When the second step signal output from the second recording control circuit is turned on, the first to fourth oscillating units are in an oscillating state and record according to the first to fourth switching signals. Erase step signal ON
Since the erasing oscillating section is made to be able to oscillate at times, erasing is started from the beginning of the track where recording is started in synchronization with the vertical sync signal at the start of recording, and recording is ended at the end of recording. Since the erasing will end at the end of the recording, the image will not change in the middle of the track, that is, in the middle of one screen, no matter when the overwrite command occurs, and the noise will occur due to the overwrite at the recording start part, It is possible to obtain an excellent effect that it is possible to prevent the occurrence of an unrecorded portion at the recording end portion.
【図面の簡単な説明】
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−
REC1……第１の信号〔ステップ信号〕。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of an embodiment of a magnetic recording apparatus of the present invention, FIG. 2 is a waveform diagram of essential parts of the apparatus, and FIG. 3 shows a relationship between recording tracks and erasing tracks. FIG. 4 is a block diagram showing a conventional magnetic recording device, FIG. 5 is a waveform diagram of main parts of the same device, and FIG. 6 is a schematic diagram showing the relationship of tracks in the same device. 2 1 to 2 4 , 7 ... Oscillation circuit, 3 ... Recording head switching circuit, 5 1 ... R1 recording head [first recording head], 5 2 ...
... L1 recording head [second recording head], 5 3 ... R2 recording head [third recording head], 5 4 ... L2 recording head [4th]
Recording head], 6 ... Flying erase head [erasing head], 8 ... First recording control circuit, 9 ... Second recording control circuit, 10 ... Oscillation control circuit, SW1 to SW4 ... Switching signals [First to fourth switching signals], D-
REC1 …… First signal [step signal].
Claims (1)
ンダに取付けて、記録ヘッドスイッチング回路から順次
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
う構成した磁気記録装置であって、 前記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を入力し、かつ前記第１〜第４
の記録ヘッドにそれぞれ接続され第１〜第４のスイッチ
ング信号に従い発振信号を出力する第１〜第４の発振部
と、 前記消去ヘッドに接続され消去発振信号を出力する消去
発振部と、 前記映像信号の垂直同期信号と記録開始信号と記録終了
信号とを入力し、記録開始信号を入力すると次の垂直同
期信号中に第１のステップ信号をON出力し、記録終了信
号を入力すると次の垂直同期信号中に前記第１のステッ
プ信号をOFF出力する第１の記録制御回路と、 前記第１の記録制御回路が出力する第１のステップ信号
と前記記録ヘッドスイッチング回路が出力する第１のス
イッチング信号とを入力して、前記第１〜第４の発振部
に第２のステップ信号を出力し、第１のステップ信号の
ON出力を検出した後、第１のスイッチング信号のON立ち
上がりのタイミングに第２のステップ信号をONにし、第
１のステップ信号のOFF出力を検出した後、第１のスイ
ッチング信号のON立ち上がりのタイミングに第２のステ
ップ信号をOFFにする第２の記録制御回路と、 前記第１の記録制御回路が出力する第１のステップ信号
と前記記録ヘッドスイッチング回路が出力する第４のス
イッチング信号とを入力して、前記消去発振部に消去ス
テップ信号を出力し、第１のステップ信号のON出力を検
出した後、第４のスイッチング信号のON立ち上がりのタ
イミングに消去ステップ信号をONにし、第１のステップ
信号のOFF出力を検出した後、第４のスイッチング信号
のON立ち上がりのタイミングに消去ステップ信号をOFF
にする発振制御部とを備え、 前記第２の記録制御回路が出力する第２のステップ信号
のON時に前記第１〜第４の発振部は発振可能状態になり
第１〜第４のスイッチング信号に従い記録をし、前記発
振制御部の消去ステップ信号のON時に前記消去発振部は
発振可能状態になることを特徴とする磁気記録装置。(57) [Claims] The erasing head and the first to fourth recording heads are mounted on a rotary cylinder, and the first to fourth recording heads are track by track according to the first to fourth switching signals sequentially output from the recording head switching circuit. Is a magnetic recording device configured to erase the four tracks recorded by the first to fourth recording heads by the erasing head in three rotations by sequentially switching the recording head switching circuit. First to first output
A fourth switching signal is input, and the first to fourth
First to fourth oscillating units which are respectively connected to the recording heads and output oscillating signals according to the first to fourth switching signals; an erasing oscillating unit which is connected to the erasing head and outputs an erasing oscillating signal; Input the vertical sync signal, the recording start signal, and the recording end signal, and when the recording start signal is input, the first step signal is turned ON during the next vertical synchronization signal, and when the recording end signal is input, the next vertical signal is output. A first recording control circuit that outputs the first step signal OFF during a synchronization signal, a first step signal that the first recording control circuit outputs, and a first switching that the recording head switching circuit outputs. Signal and outputs a second step signal to the first to fourth oscillators,
After detecting the ON output, turn on the second step signal at the ON rising timing of the first switching signal, and after detecting the OFF output of the first step signal, turn on the rising edge of the first switching signal. A second recording control circuit for turning off the second step signal, a first step signal output by the first recording control circuit, and a fourth switching signal output by the recording head switching circuit. Then, the erase step signal is output to the erase oscillation unit, the ON output of the first step signal is detected, and then the erase step signal is turned ON at the timing of the ON rise of the fourth switching signal, and the first step After detecting the OFF output of the signal, turn off the erase step signal at the timing of the ON rise of the 4th switching signal.
And an oscillation control unit for switching the second step signal output from the second recording control circuit to the ON state, the first to fourth oscillation units are in an oscillating state and the first to fourth switching signals. The magnetic recording device is characterized in that the erasing oscillation section is oscillated when the erasing step signal of the oscillation control section is turned on.
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 JPS63253505A (en) | 1988-10-20 |
| JP2679785B2 true 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) |
Family Cites Families (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
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63253505A (en) | 1988-10-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CA1069614A (en) | Tape editing system | |
| JPH0345286Y2 (en) | ||
| JP2536947B2 (en) | Disk recording and reading method | |
| JPH07105936B2 (en) | Read signal time axis controller | |
| JP2679785B2 (en) | Magnetic recording device | |
| JP2556463B2 (en) | Information signal recording / reproducing device | |
| JPH0743811B2 (en) | Image recording / reproducing device | |
| JPH0427756B2 (en) | ||
| JPS6127818B2 (en) | ||
| KR920008218B1 (en) | Eraze circuit for 4 head drum | |
| JPH057827Y2 (en) | ||
| JPH0614269Y2 (en) | Kew signal recording / reproducing device | |
| JP2500869B2 (en) | Digital signal playback device | |
| JPS6342760Y2 (en) | ||
| JP2708176B2 (en) | Video signal playback device | |
| KR0131574Y1 (en) | Head driver | |
| JPH0138761Y2 (en) | ||
| JPS5997283A (en) | Control circuit of magnetic recorder and reproducer | |
| JP2602501B2 (en) | Code signal changing device for magnetic tape | |
| JPH0510735B2 (en) | ||
| JPH0636259B2 (en) | Magnetic recording / reproducing device | |
| JPS628071B2 (en) | ||
| JPS6311837B2 (en) | ||
| JPH02105360A (en) | Control signal recording/reproducing device for video tape recorder | |
| JPH0264953A (en) | Video recording and reproducing device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term | ||
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20070801 Year of fee payment: 10 |