JPS59112778A - Magnetic recording and reproducing device - Google Patents
Magnetic recording and reproducing deviceInfo
- Publication number
- JPS59112778A JPS59112778A JP57223193A JP22319382A JPS59112778A JP S59112778 A JPS59112778 A JP S59112778A JP 57223193 A JP57223193 A JP 57223193A JP 22319382 A JP22319382 A JP 22319382A JP S59112778 A JPS59112778 A JP S59112778A
- Authority
- JP
- Japan
- Prior art keywords
- head
- circuit
- heads
- output
- azimuth
- 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
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/76—Television signal recording
- H04N5/91—Television signal processing therefor
- H04N5/93—Regeneration of the television signal or of selected parts thereof
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (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 本発明は磁気記録再生装置に関するものである。[Detailed description of the invention] Industrial applications The present invention relates to a magnetic recording/reproducing device.
従来例の構成とその問題点
2時間モード、6時開モード共に、高速サーチ、ブレの
ないフィールドスチルが可能な方法として、第1図に示
すように、異なるアジマス角のヘッドを約IHもしくは
2H間隙(870μm〜740μm )で取付けた4ヘ
ッド方式が開発されている。このヘッド仕様においては
、全モード再生を可能とするために、L′ヘッドは約4
5μm1残りのヘッドは約80μmのヘッド幅が使用さ
れる。このヘッド仕様において、フィールドスチルを行
なう場合、完全なる最適位置までテープ位置をずらせた
場合、6時間モードでは、R+r<’ヘッドのペアー、
2時間モードでは、L、L’ヘッドのペアーが最適とな
る。Conventional configuration and its problems In both the 2-hour mode and the 6-hour open mode, a method that enables high-speed search and field still without blur is to use heads with different azimuth angles at approximately IH or 2H, as shown in Figure 1. A four-head system installed with a gap (870 μm to 740 μm) has been developed. In this head specification, in order to enable all mode playback, the L' head is approximately 4.
A head width of about 80 μm is used for the remaining heads. With this head specification, when performing field stills, when the tape position is shifted to the completely optimal position, in 6-hour mode, R+r<' head pair,
In the 2-hour mode, the pair of L and L' heads is optimal.
簡易スチル方式として、自動ノイズ送り出しを用いない
場合においては、特に2時間モードで最悪全面ノイズと
なり、非常に見苦しい直面となる。If automatic noise transmission is not used as a simple still system, the worst case scenario is full noise, especially in the 2-hour mode, resulting in a very unsightly appearance.
ところで、上記のように、ヘッド幅を80μmもしくは
これ以上の値としているため、2時間モードのトラック
ピッチ58μmとの関連において、磁気テープに接触す
るR又はLヘッドのどちらかのヘッドには必ず出力が現
われる。従って、近接するヘッドのヘッド出力を比較し
、大きな出力を有するヘッドを選択して再生すれば、上
記のノイズは大幅に改善される。By the way, as mentioned above, since the head width is set to 80 μm or more, in relation to the track pitch of 58 μm in the 2-hour mode, there is always output to either the R or L head that contacts the magnetic tape. appears. Therefore, by comparing the head outputs of adjacent heads and selecting the head with the highest output for reproduction, the above-mentioned noise can be significantly improved.
しかしながら、もう1つの間践として画像ゆれが発生す
る。スチル画像においては、垂直同期信8部分にノイズ
を追いこんで画面上のノイズレスを図るために、垂直同
期不安定となりやすく、このため、シリンダーにおける
PGより作ったヘッド切換信号を遅延して作った疑似垂
直同期信号が加えられる。第1図に示すヘッドにおいて
、近接するへ′ラドは約1〜2H程度のずれであるので
、ヘッド切換信号は一定のままで良く、使用するヘッド
に応じてヘッド切換位置はヘッド出力のオー/に−ラッ
プの中で変化することとなる。ところが、近接するヘッ
ド位置のずれは、再生する映像信号のずれとなるため、
第2図に示すように、R,R’ヘッドを用いたスチルと
、L、L’ヘッドを用いたスチルとでは、ヘッド切換信
号と映像信号との関係は異なる。なお第2図中に示す値
は、2H間隙のヘッドを用いて、R’、L’ヘッドにて
記録した場合の概略の数値である。ノイズ部を完全に垂
直同期信号の中に追いこんで、R、R’ヘッドもしくは
り、L’ヘッドのみでスチル再生をする場合は、第2図
に示す垂直同期信号が存在する位置に、ヘッド切換信号
より作る疑似垂直同期信号の遅延量を合わせれば良い。However, another problem is that image shaking occurs. In still images, vertical synchronization tends to become unstable because noise is forced into the 8 vertical synchronization signals to eliminate noise on the screen. A vertical sync signal is added. In the head shown in Fig. 1, the difference between adjacent heads is about 1 to 2H, so the head switching signal can remain constant, and the head switching position can be adjusted depending on the head used. - will change within the lap. However, a shift in the position of adjacent heads results in a shift in the video signal being played back.
As shown in FIG. 2, the relationship between the head switching signal and the video signal is different between a still using R, R' heads and a still using L, L' heads. Note that the values shown in FIG. 2 are approximate numerical values when recording is performed with R' and L' heads using heads with a 2H gap. If you want to completely drive the noise part into the vertical sync signal and play stills using only the R, R' heads or the L' heads, switch the heads to the position where the vertical sync signal is present as shown in Figure 2. All you have to do is match the delay amount of the pseudo vertical synchronization signal created from the signal.
しかし、画面の中にR、R’ヘッドとL 、 L’ヘッ
ドとの切換え個所が規われる位置にテープが停止した場
合は、どちらかの部分にて垂直方向のゆれが発生する。However, if the tape stops at a position on the screen where switching between the R, R' heads and the L, L' heads is determined, vertical wobbling will occur in one of the parts.
すなわち、R,に’ヘッドに疑似垂直同期信号の位相を
合わせれば、L。That is, if the phase of the pseudo vertical synchronization signal is adjusted to R, then L.
L′ヘッド側において垂直ゆれが発生する。例えば第2
図に示す場合であれば4H幅の垂直ゆれが発生する。逆
にり、L’ヘッド側に合わせれば、R、R’ヘッド側に
同様の垂直ゆれが発生する。この垂直ゆれを完全に取る
には、2 Hのディレィラインを用い、R、R’ヘッド
とL 、 L’ヘッドとの時間ずれを除去する必要があ
り、大幅なコストを必要とするので、目的である簡易ス
チルの実現には適していない。Vertical vibration occurs on the L' head side. For example, the second
In the case shown in the figure, vertical vibration of 4H width occurs. On the other hand, if it is adjusted to the L' head side, a similar vertical vibration will occur on the R and R' head sides. In order to completely eliminate this vertical fluctuation, it is necessary to use a 2H delay line to eliminate the time lag between the R, R' heads and the L, L' heads, which requires a large amount of cost. It is not suitable for realizing simple stills.
発明の目的
本発明は上記従来の欠点を解消するもので、画像の部分
的なゆれはさけられないと認め、より大きな部分の垂直
ゆれを止めることにより、実用的な簡易スチルの実現を
図ることのできる磁気記録再生装置を提供することを目
的とする。OBJECT OF THE INVENTION The present invention solves the above-mentioned conventional drawbacks, recognizes that partial image shake is unavoidable, and aims to realize a practical simple still by stopping vertical shake of a larger portion. The purpose of the present invention is to provide a magnetic recording/reproducing device that can perform the following functions.
発明の構成
上記目的を達するため、本発明の磁気記録再生装置は、
2個のRアジマスヘッド及び2個のLアジマスヘッドを
、相異なるアジマスヘッドが互いに近接しかつ相異なる
アジマスヘッドが互いに180度位置となるように取付
け、さらに少なくとも1個のパルス発生器を取付けたシ
リンダーと、前記ノ”でルス発生器からのパルスにより
ヘッド切換信号を作出するヘッド切換信号発生回路と、
テープに同時に接触する2個のヘッドの出力の大小を比
較する比較手段と、同時に接触する2個のヘツド出力を
切換える切換手段と、前記ヘッド切換信号により°大幅
垂直同期信号位置に対応する疑似垂直同期信号mを作出
する疑似垂直同期信号発生回路と、Rアジマスヘッドに
よるフィールド再生時とLアジマスヘッドによるフィー
ルド再生時とに応じて前記疑似垂直同期信号の挿入位置
を切換える遅延量切換回路と、静止画像におけるRアジ
マス画像部とLアジマス画像部との比率を判別する大小
比率判別回路とを備え、静止画像再生時に、前記切換手
段に基づき画面中にてヘッド出力を切換えると共に、前
記大小比率判別回路の出力により前記遅延量切換回路を
制御する構成としたものである。Structure of the Invention In order to achieve the above object, the magnetic recording and reproducing apparatus of the present invention comprises:
Two R azimuth heads and two L azimuth heads were mounted so that the different azimuth heads were close to each other and the different azimuth heads were at 180 degrees from each other, and at least one pulse generator was also mounted. a cylinder, and a head switching signal generation circuit that generates a head switching signal using a pulse from a pulse generator at the cylinder;
a comparison means for comparing the magnitude of the outputs of two heads that contact the tape at the same time; a switching means for switching the outputs of the two heads that contact the tape at the same time; a pseudo vertical synchronizing signal generation circuit that generates a synchronizing signal m; a delay amount switching circuit that switches the insertion position of the pseudo vertical synchronizing signal according to field reproduction by the R azimuth head and field reproduction by the L azimuth head; a size ratio discrimination circuit for determining a ratio between an R azimuth image part and an L azimuth image part in an image, and when reproducing a still image, the head output is switched in the screen based on the switching means, and the size ratio discrimination circuit The delay amount switching circuit is controlled by the output of the delay amount switching circuit.
実施例の説明
以下、本発明の一実施例について、図面に基づいて説明
する。第3図において、R,L、L’、R’の各ヘッド
(1)〜(4)からの信号は、それぞれ独立なアンプ(
5)〜(至)により増幅され、P G (9)からの出
力によりヘッド切換信号発生回路(ト)で作られたヘッ
ド切換信号によってスイッチOOQυを介して選択され
て、同時にテープに接触したヘッドから得られる2うの
信号となる。この出力はそれぞれ振幅検波回路(2)C
1により振幅検波され、その出力は大小比較器α◆にて
比較され、この出力である大小比較信号によって、より
大きな出力のヘッドを選択するように、出力切換スイッ
チoeが切換えられる。DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In Fig. 3, the signals from each head (1) to (4) of R, L, L', and R' are received by an independent amplifier (
5) to (to) and selected via the switch OOQυ by the head switching signal generated by the head switching signal generation circuit (g) based on the output from PG (9), and the head that is in contact with the tape at the same time. There are two signals obtained from . This output is the amplitude detection circuit (2) C
1, the output is compared by a magnitude comparator α◆, and the output selector switch oe is switched to select the head with the larger output based on the magnitude comparison signal that is the output.
かくして選択された出力は、復調器QlによりFM復調
及びクロマ処理が施されてビデオ信号となり、混合回路
aηで疑似垂直同期信号をミックスされて映像信号とし
て出力される。疑似垂直同期信号は、ヘッド切換信号に
より、疑似垂直同期信号発生回路臼により作られるが、
このための遅延量は、遅延量切換回路に)により、R、
R’ヘッド(1)(4)に適した値と、L 、 L’ヘ
ッド(2) (3)に適した値とのいずれかが選択され
る。この遅延量切換回路(ホ)は、前記ヘッド切換信号
と大小比較信号とにより、R,R’ヘッド(1) (4
)又はり、L’ヘッド(2> (3)の比率判定を行な
う大小比率判別回路Q])にて制御される。The thus selected output is subjected to FM demodulation and chroma processing by the demodulator Ql to become a video signal, mixed with a pseudo vertical synchronization signal by the mixing circuit aη, and output as a video signal. The pseudo vertical synchronization signal is generated by the pseudo vertical synchronization signal generation circuit according to the head switching signal.
The delay amount for this is determined by the delay amount switching circuit (R,
One of the values suitable for the R' heads (1) and (4) and the values suitable for the L and L' heads (2) and (3) is selected. This delay amount switching circuit (E) is configured to operate the R, R' heads (1) (4) using the head switching signal and the magnitude comparison signal.
) or the L' head (2>(3), the magnitude ratio determining circuit Q) which performs the ratio determination.
第4因は大小比率判別回路Qυの一具体例を示す回路図
で、R、L’ヘッド(1) (3)においてはハイレベ
ル、L、R’ヘッド(2) (4)においてはローレベ
ルとなるヘッド切換信号と、R,Lヘッド(1) (2
>を用いるlハイレベル、R’、L’ヘッド(4) (
3)を用いる場合ローレベルとなる大小比較信号とを、
排他的論理和ゲート回路四により、L、L’ヘッド(2
) (3)の場合はハイレベル、R,R’ヘッド(1)
(4)の場合はローレベルの波形に変換し、この波形
を、抵抗(R1)及びコンデンサ(C1)により積分し
、平均値を比較器(至)で基準電圧と比較することによ
り、大略デユーティ50%をスレッショールドとする遅
延量切換出力を得る。The fourth factor is a circuit diagram showing a specific example of the size ratio discrimination circuit Qυ, in which the R and L' heads (1) (3) are at high level, and the L and R' heads (2) and (4) are at low level. Head switching signal and R, L heads (1) (2
> using l high level, R', L' head (4) (
When using 3), the magnitude comparison signal that becomes low level is
Exclusive OR gate circuit 4 connects L and L' heads (2
) In case of (3), high level, R, R' head (1)
In the case of (4), by converting to a low level waveform, integrating this waveform using a resistor (R1) and a capacitor (C1), and comparing the average value with the reference voltage using a comparator (total), approximately the duty cycle can be determined. Obtain delay amount switching output with 50% as the threshold.
第5図は大小比率判別回路QI)の他の具体例を示す回
路ブロック図である。画面上のR、R’ヘッド(1)
(4)の画像とL 、 L’ヘッド(2) (3)の画
像との切換わり方は、全画面がどちらかのへラドペアー
のみとなり、テープ位置がずれると、上又は下から徐々
に他のへラドペアー画像となり、完全にこのペアーのみ
となる。さらにずらすと、最初のペアーの画像が上又は
下より現われ、広がってゆく。つまり、直面の中央のみ
が異なるヘッドペアーとなることはない。この性質を利
用すれば、画面中央におけるへ゛多ドペアーの選択のみ
にて、大小比率を判別できることがわかる。そこで、画
面中央に対応する約8.8ms遅延された遅延回路伐蜀
の出力のエツジにおいて、大小比較信号のレベルをDフ
リップフロップ(ハ)にてメモリーすることにより上記
の方式を実現している。FIG. 5 is a circuit block diagram showing another specific example of the size ratio discriminating circuit QI). R, R' head on screen (1)
The way in which the image in (4) and the images in the L and L' heads (2) and (3) are switched is that the entire screen is only for one pair of tapes, and when the tape position shifts, the other one gradually changes from above or below. It becomes a herad pair image, and it becomes only this pair. When shifted further, the first pair of images appears from the top or bottom and spreads out. In other words, there is no case where a pair of heads differs only in the center of the face. It can be seen that by utilizing this property, it is possible to determine the size ratio simply by selecting a large number of pairs in the center of the screen. Therefore, the above method is realized by storing the level of the magnitude comparison signal in a D flip-flop (c) at the edge of the output of the delay circuit delayed by about 8.8 ms corresponding to the center of the screen. .
発明の詳細
な説明したように本発明によれば、スチル画面中におけ
るヘッドペアー切換、および大小比率判別による疑似垂
直同期信号遅延量切換により、スチル再生におけるノイ
ズやゆれを良好に除去できる安価な磁気記録再生装置を
実現し得る。As described in detail, the present invention provides an inexpensive magnetic material that can effectively eliminate noise and vibration in still playback by switching between head pairs during a still screen and switching pseudo vertical synchronization signal delay amount by determining the size ratio. A recording and reproducing device can be realized.
第1図はヘッド配置の説明図、第2図はスチル再生にお
けるヘッド切換信号と映像信号との関係の説明図、第8
図は本発明の一実施例における磁気記録再生装置の要部
の回路ブロック図、第4図は大小比率判別回路の一具体
例を示す回路図、第5図は大小比率判別回路の他の具体
例を示す回路図である。
(1)・・Rヘッド、(2)・・Lヘッド、(3)・■
ブヘッド、(4)・・R′ヘッド、(5)〜(8)・・
アンプ、(9)・・P G、010υ・・・スイッチ、
02 F+3・振幅検波回路、a<−・・大小比較器、
α9・・・出力切換スイッチ、OQ・・復調器、αη・
・混合回路、0峰・・ヘッド切換信号発生回路、Ql・
・・疑似垂直同期信号発生回路、(イ)・・・遅延量切
換回路、Qυ・・大小比較判別回路
代理人 森 本 義 弘
第3図
第4図Fig. 1 is an explanatory diagram of the head arrangement, Fig. 2 is an explanatory diagram of the relationship between the head switching signal and the video signal in still playback, and Fig. 8 is an explanatory diagram of the relationship between the head switching signal and the video signal in still playback.
The figure is a circuit block diagram of the main part of a magnetic recording and reproducing apparatus according to an embodiment of the present invention, FIG. 4 is a circuit diagram showing one specific example of a size ratio discriminating circuit, and FIG. 5 is a circuit diagram showing another specific example of a size ratio discriminating circuit. FIG. 2 is a circuit diagram showing an example. (1)...R head, (2)...L head, (3)...■
Head, (4)...R' head, (5)-(8)...
Amplifier, (9)...PG, 010υ...switch,
02 F+3・amplitude detection circuit, a<-・size comparator,
α9...Output selector switch, OQ...Demodulator, αη...
・Mixing circuit, 0 peak ・Head switching signal generation circuit, Ql ・
...Pseudo vertical synchronization signal generation circuit, (a)...Delay amount switching circuit, Qυ...Size comparison discrimination circuit Representative Yoshihiro Morimoto Figure 3 Figure 4
Claims (1)
ッドを、相異なるアジマスヘッドが互いに近接しかつ相
異なるアジマスヘッドが互いに180度位置となるよう
に取付け、さらに少なくとも1個のパルス発生器を取付
けたシリンダーと、前記パルス発生器からのパルスによ
りヘッド切換信号を作出するヘッド切換信号発生回路と
、テープに同時に接触する2個のヘッドの出力の大小を
比較する比較手段と、同時に接触する2個のヘッド出力
を切換える切換手段と、前記ヘッド切換信号により大略
垂直同期信号位置に対応する疑似垂直同期信号を作出す
“る疑似垂直同期信号発生回路と、Rアジマスヘッドに
よるフィールド再生時とLアジマスヘッドによるフィー
ルド再生時とに応じて前記疑似垂直同期信号の挿入位置
を切換える遅延量切換回路と、静止画像におけるRアジ
マス画像部とLアジマス画像部との比率を判別する大小
比率判別回路とを備え、静止面像再生時に、前記比較手
段に基づき画面中にてヘッド出力を切換えると共に、前
記大小比率判別回路の出力により前記遅延量切換回路を
制御する構成とした磁気記録再生装置。 2、大小比率判別回路は、RアジマスまたはLアジマス
ヘッド選択波形発生回路と、積分回路と、比較回路とを
有し、選択波形の平均値と基Q−電圧との大小により比
率判別を行なう構成とした特許請求の範囲第1項記載の
磁気記録再生装置。 3、 大小比率判別回路は、ヘッド切換信号の大略1/
4周期の遅延量を有する遅延回路と、Dタイプのフリッ
プフロップとを有し、遅延回路出力時における大小比較
信号をメモリーし、このメモリー出力を大小比率判別出
力とする構成とした特許請求の範囲第1項記載の磁気記
録再生装置。[Scope of Claims] 1. Two R azimuth heads and two R azimuth heads are mounted so that the different azimuth heads are close to each other and the different azimuth heads are positioned at 180 degrees from each other, and furthermore, at least one a cylinder to which two pulse generators are attached, a head switching signal generation circuit that generates a head switching signal using pulses from the pulse generator, and a comparison means that compares the magnitude of the output of two heads that simultaneously contact the tape. , a switching means for switching the outputs of the two heads that are in contact with each other at the same time, a pseudo vertical synchronization signal generation circuit that generates a pseudo vertical synchronization signal approximately corresponding to the vertical synchronization signal position based on the head switching signal, and an R azimuth head. a delay amount switching circuit that switches the insertion position of the pseudo vertical synchronization signal according to field playback and field playback by the L azimuth head; and a delay amount switching circuit that determines the ratio of the R azimuth image part and the L azimuth image part in a still image. a ratio discriminating circuit, and when reproducing a still surface image, the head output is switched in the screen based on the comparing means, and the delay amount switching circuit is controlled by the output of the magnitude ratio discriminating circuit. Apparatus. 2. The magnitude ratio discrimination circuit has an R azimuth or L azimuth head selection waveform generation circuit, an integrating circuit, and a comparison circuit, and discriminates the ratio based on the magnitude of the average value of the selected waveform and the base Q-voltage. The magnetic recording and reproducing apparatus according to claim 1, which is configured to perform
Claims include a delay circuit having a delay amount of four cycles and a D-type flip-flop, storing a magnitude comparison signal at the output of the delay circuit, and using this memory output as a magnitude ratio discrimination output. 2. The magnetic recording and reproducing device according to item 1.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP57223193A JPS59112778A (en) | 1982-12-20 | 1982-12-20 | Magnetic recording and reproducing device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP57223193A JPS59112778A (en) | 1982-12-20 | 1982-12-20 | Magnetic recording and reproducing device |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS59112778A true JPS59112778A (en) | 1984-06-29 |
Family
ID=16794254
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP57223193A Pending JPS59112778A (en) | 1982-12-20 | 1982-12-20 | Magnetic recording and reproducing device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS59112778A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6333079A (en) * | 1986-07-28 | 1988-02-12 | Matsushita Electric Ind Co Ltd | Forming device for reference signal for video signal |
JPH01243785A (en) * | 1988-03-25 | 1989-09-28 | Hitachi Ltd | Picture processing unit |
JPH02196579A (en) * | 1988-12-31 | 1990-08-03 | Samsung Electron Co Ltd | Multifunction video head selecting device and its method |
-
1982
- 1982-12-20 JP JP57223193A patent/JPS59112778A/en active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6333079A (en) * | 1986-07-28 | 1988-02-12 | Matsushita Electric Ind Co Ltd | Forming device for reference signal for video signal |
JPH01243785A (en) * | 1988-03-25 | 1989-09-28 | Hitachi Ltd | Picture processing unit |
JPH02196579A (en) * | 1988-12-31 | 1990-08-03 | Samsung Electron Co Ltd | Multifunction video head selecting device and its method |
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