JPS5883325A - Automatic tracking device - Google Patents
Automatic tracking deviceInfo
- Publication number
- JPS5883325A JPS5883325A JP56179473A JP17947381A JPS5883325A JP S5883325 A JPS5883325 A JP S5883325A JP 56179473 A JP56179473 A JP 56179473A JP 17947381 A JP17947381 A JP 17947381A JP S5883325 A JPS5883325 A JP S5883325A
- Authority
- JP
- Japan
- Prior art keywords
- tracking
- automatic tracking
- circuit
- output
- signal
- 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
- 230000007704 transition Effects 0.000 abstract description 6
- 238000010586 diagram Methods 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B21/00—Head arrangements not specific to the method of recording or reproducing
- G11B21/02—Driving or moving of heads
- G11B21/10—Track finding or aligning by moving the head ; Provisions for maintaining alignment of the head relative to the track during transducing operation, i.e. track following
- G11B21/103—Track finding or aligning by moving the head ; Provisions for maintaining alignment of the head relative to the track during transducing operation, i.e. track following on tapes
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
- G11B5/58—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with provision for moving the head for the purpose of maintaining alignment of the head relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
- G11B5/584—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with provision for moving the head for the purpose of maintaining alignment of the head relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following for track following on tapes
- G11B5/588—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with provision for moving the head for the purpose of maintaining alignment of the head relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following for track following on tapes by controlling the position of the rotating heads
- G11B5/592—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with provision for moving the head for the purpose of maintaining alignment of the head relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following for track following on tapes by controlling the position of the rotating heads using bimorph elements supporting the heads
Landscapes
- Adjustment Of The Magnetic Head Position Track Following On Tapes (AREA)
- Control Of Position Or Direction (AREA)
Abstract
Description
【発明の詳細な説明】
略称する）の情報に基づいて自動的にトラッキングを行
なうべく、再生回転ヘッドをバイモルフ型圧電素子等の
ヘッド駆動素子上に取シっけて、シリンダの回転軸に沿
った方向に変位可能にしたビデオテープレコーダ（以下
、ＶＴＲと略称する）において、ＲＦ倍信号乱れること
があらがじめ予想される期間における自動トラッキング
の誤動作を防止し、通常のトラッキング動作にスムーズ
に移行するようにした自動トラッキング装置に関するも
のである。[Detailed Description of the Invention] In order to automatically perform tracking based on the information of In video tape recorders (hereinafter referred to as VTRs) that can be displaced in different directions, this function prevents automatic tracking malfunctions during periods when RF signal disturbances are expected, and allows normal tracking operations to proceed smoothly. The present invention relates to an automatic tracking device configured to migrate.
従来、ＲＦ倍信号らの情報に゛より、′再生回転ヘッド
と記録トラックとのトラッキング状態を検出し、良好な
トラッキングになるように再生回転ヘッドをシリンダの
回転軸に沿った方向に変位させる、いわゆる自動トラッ
キング装置として種々の方法が報告されている。例えば
ＲＦ倍信号検波し、その検波出力を順次サンプリングし
、そ′のサン・プル出力を順次比較し、その結果、検波
出力が増１大する方向へ再生回転ヘッドを変位さ瞥る装
置があ動作を行なう装置は、ＲＦ倍信号正常に出力され
るということが前提となっていることは言うまでもない
。Conventionally, the tracking state of the reproducing rotary head and the recording track is detected based on information such as RF multiplied signals, and the reproducing rotary head is displaced in the direction along the rotation axis of the cylinder so as to achieve good tracking. Various methods have been reported as so-called automatic tracking devices. For example, there is a device that detects an RF multiplied signal, sequentially samples the detected output, sequentially compares the sampled outputs, and then moves the reproducing rotary head in the direction that increases the detected output. It goes without saying that the operating device is premised on the ability to normally output the RF multiplied signal.
ところが、ＲＦ倍信号出力されなかったり、断続的に出
力したりする時には、乱れたトラッキング動作が正確に
行なわれず、乱れたトラッキング情報を出力してしまう
ことになる。However, when the RF multiplied signal is not output or is output intermittently, the disordered tracking operation will not be performed accurately and disordered tracking information will be output.
例えば、記録時と異なる速度でのノイズレス再生を可能
とするために前述のヘッド駆動素子を用いて、記録され
たトラックを再生ヘッドが走査するように再生ヘッドを
フィールド単位で移動させるＶＴＲがある。この場合、
自動トラッキングとは別に速度差に応じた傾斜波形を発
生し、ヘッド駆動素子に加える。第１図に変速再生モー
ドとヘッド駆動傾斜波形の例を示す。同図の（＆）は再
生時の速度モードを現わして卦り、最初スロー再生して
いて、モード切換時点Ｐで逆転スロー再生に切換え、さ
らにＱ点で早送り再生に切換えていることを示している
。また、（ｂ）は再生ヘッドの走査軌しく走査するよう
に再生ヘッドを駆動するだめの信号波形である。（ｂ）
においてスロー再生時のＰ点までの波形は正しく得られ
るが逆スロー再生に切換えたＰ点からＲ点までの間は正
しい補正波形が得られない。これは、例えば磁気テープ
に急速な速度変化が生じるため、磁気テープが一瞬浮い
て補正波形を作り出すもととなるコントロール信号が出
なかったり、テープ走行の向きが変わること・により、
コントロール信号の欠落、２重再生を生じたり、あるい
は補正波形を作り出すための信号であるキャプスタンＦ
Ｇパルスの計数を乱したりするためである。Ｒ点以後は
補正波形が正常な逆スロー用のものとなるが、Ｑ点で早
送り再生に切−り換えられると、Ｑから８点までは、同
様に補極シ波形が乱れてしまい、そのあと正しい早送り
再生用の補正波形が得られる。つまり（Ｃ）に示すよう
に再生モードを切り換えた時点から所定時間内は補正波
形が乱れてしまう。したがって補正波形の乱れにより再
生されるＲＦ倍信号断続的な家のとなな期間にＲＦ倍信
号エンベロープを情報とする自動トラッキング動作を行
なわせると、正しいトラッキング動作を行なわないばか
りでなく、以前に持っていた正しいトラッキング情報を
失なってしまい、異常な情報になってしまうことがある
。そのため補正波形が正しい状態に戻っても、自動トラ
ッキング動作による引込みが遅れ、正しい再生画像が得
られるのが遅れるという問題があった。For example, in order to enable noiseless reproduction at a speed different from that during recording, there is a VTR that uses the aforementioned head driving element to move the reproduction head field by field so that the reproduction head scans the recorded track. in this case,
Apart from automatic tracking, a slope waveform corresponding to the speed difference is generated and applied to the head drive element. FIG. 1 shows an example of a variable speed reproduction mode and a head drive gradient waveform. The symbol (&) in the same figure indicates the speed mode during playback, indicating that slow playback is performed at first, then switches to reverse slow playback at mode switching point P, and then switches to fast forward playback at point Q. ing. Further, (b) is a signal waveform for driving the reproducing head so that the reproducing head scans in the scanning trajectory. (b)
Although the waveform up to point P during slow playback can be obtained correctly, the correct corrected waveform cannot be obtained between point P and point R when switching to reverse slow playback. This is because, for example, a rapid speed change occurs in the magnetic tape, causing the magnetic tape to float for a moment and the control signal that creates the correction waveform is not output, or the direction of tape running changes.
Capstan F, which is a signal to cause control signal loss, double playback, or to create a correction waveform.
This is to disturb the counting of G pulses. After point R, the corrected waveform becomes a normal reverse slow waveform, but when switched to fast forward playback at point Q, the complementary waveform is similarly disturbed from Q to point 8, and the waveform is distorted. Also, you can obtain the correct correction waveform for fast-forward playback. In other words, as shown in (C), the correction waveform is disturbed within a predetermined period of time after switching the playback mode. Therefore, if an automatic tracking operation using the RF double signal envelope as information is performed during a period when the RF double signal reproduced due to a disturbance in the correction waveform is intermittent, not only will the tracking operation not be performed correctly, but the tracking operation will not be performed correctly. Correct tracking information that you had may be lost, resulting in abnormal information. Therefore, even if the corrected waveform returns to the correct state, there is a problem in that the pull-in by the automatic tracking operation is delayed, resulting in a delay in obtaining a correct reproduced image.
要するに再生モードの切換えにより画像の乱れる時間が
長くなるという問題があった。In short, there is a problem in that switching the reproduction mode increases the amount of time the image is disturbed.
本発明は、上記の問題点を解決するものであって、再生
モード切換えなど、あらかじめ補正波形が乱れてＲＦ倍
信号乱れることが予測される期間は、自動トラッキング
動作を停止させて、以前のトラッキング情報を保持して
おき、所定時間後、すなわち正しい補正波形が出方され
て正常なＲＦ倍信号得られる状態において、保持してい
たトラッキング情報から自動トラッキング動作を開始さ
せるように構成したものである。これにより、モ −
一ド切換え時の再生画像乱れの時間を著しく短かくでき
、スムーズなモード切換えが実現される。The present invention is intended to solve the above-mentioned problems. During periods when it is predicted that the correction waveform will be disturbed and the RF multiplied signal will be disturbed, such as when switching the playback mode, the automatic tracking operation is stopped and the previous tracking is performed. The system is configured to hold information and start automatic tracking operation from the held tracking information after a predetermined period of time, that is, in a state where a correct correction waveform is generated and a normal RF multiplied signal is obtained. . As a result, the time during which the reproduced image is disturbed when switching modes can be significantly shortened, and smooth mode switching can be realized.
第２図は、本発明の一実施例の要部ブロック図を示した
ものである。同図において、ＶＴＲ１からのＲＦ倍信号
トラッキングの入力情報として自動トラッキング回路２
に入力され、処理される。FIG. 2 shows a block diagram of essential parts of an embodiment of the present invention. In the same figure, the automatic tracking circuit 2 receives input information for tracking the RF multiplied signal from the VTR 1.
input and processed.
なお、上記自動トラッキング回路２は周知の適当な構成
のものを使用し得る。It should be noted that the automatic tracking circuit 2 may be of any known suitable configuration.
ＶＴＲ１のヘッド駆動素子５には、トラッキング回路２
の出力と再生ヘッドの走査軌跡補正波形発生器６の出力
とが加算器７で加算されて印加される。ＶＴＲ１からは
再生モードの切換信号が出力され、それは時間設定回路
３に供給される。時間設定回路３はモード切換え時点か
ら補正波形が正常に出力されるまでの時間を設定し、例
えば、その期間のみゞＬルベルとなるようなパルス信号
を出力する。このパルス信号は制御回路４に与えられ、
制御回路４は、パルス信号が″ＩＬルベルの時のみ自動
トラッキング動作を停止せしめ、停止寸前のトラッキン
グ情報を保持するアラに自動トラッキング回路２を制御
する。したがって自動トラッキンダ回路２には、以前の
最終情報を保持する記憶−路とトラッキング動作を停止
、再動作させるためのリセット回路とが含まれている。The head drive element 5 of the VTR 1 includes a tracking circuit 2.
and the output of the scanning locus correction waveform generator 6 of the reproducing head are added by an adder 7 and applied. A playback mode switching signal is output from the VTR 1 and is supplied to the time setting circuit 3. The time setting circuit 3 sets the time from the time of mode switching until the corrected waveform is normally output, and outputs, for example, a pulse signal that is at the low level only during that period. This pulse signal is given to the control circuit 4,
The control circuit 4 stops the automatic tracking operation only when the pulse signal is "IL level", and controls the automatic tracking circuit 2 to maintain the tracking information that is about to stop. Therefore, the automatic tracking circuit 2 has the previous final It includes a memory path for holding information and a reset circuit for stopping and restarting the tracking operation.
なお、ここでは自動トラッキング回路２の動作について
は詳述していないが、本発明の意図するトラッキング動
作をＲＦ倍信号正常に出力される状態においてのみ行な
わせ、モード移行などＲＦ倍信号乱れる期間は停止させ
る点け、どのようなタイプの自動トラッキング回路であ
っても適用しうる。Although the operation of the automatic tracking circuit 2 is not described in detail here, the tracking operation intended by the present invention is performed only in a state where the RF multiplied signal is normally output, and during periods when the RF multiplied signal is disturbed, such as during mode transition. Any type of automatic tracking circuit can be applied.
以上の説明から明らかなように、本発明は、再生ＲＦ信
号に基づいて自動トラッキングを行なうべく可動再生回
転ヘッドを備えたＶＴＲにおいて、モード移行など、再
生ＲＦ信号が乱れる期間は自動トラッキング動作を停止
し、停止前のトラッキング情報を保持し、通常のトラッ
キング動作に戻る時には保持したトラッキング情報より
動作を開始することにより、モード移行時などの再生画
像乱れを短かく抑えることができる。これは、自動ド移
行時の画品質劣化を少なくでき、その効果は犬なるもの
がある。As is clear from the above description, the present invention provides a VTR equipped with a movable reproducing rotary head to perform automatic tracking based on a reproduced RF signal, and in which the automatic tracking operation is stopped during a period in which the reproduced RF signal is disturbed, such as during a mode transition. However, by retaining the tracking information before stopping and starting the operation based on the retained tracking information when returning to normal tracking operation, it is possible to suppress reproduction image disturbances such as when changing modes. This can reduce image quality deterioration during automatic mode transition, and the effect is impressive.
第１図（ＩＬ） 、 （ｂ） 、 （Ｃ）は変速再生可
能なＶＴＲのモード移行を示す状態図、第２図は本発明
の一実施例を示す要部ブロック構成図である。
１・・・・・・ＶＴＲ，２・・・・・・自動トラッキン
グ回路、３・・・・・・時間設定回路、４・・・・・・
制御回路、６・・・・・・ヘッド駆動素子、６・・・・
・・走査軌跡補正波形発生器、７・・・・・・加算器。FIGS. 1(IL), (B), and (C) are state diagrams showing mode transitions of a VTR capable of variable speed playback, and FIG. 2 is a block diagram of essential parts showing an embodiment of the present invention. 1... VTR, 2... Automatic tracking circuit, 3... Time setting circuit, 4...
Control circuit, 6...Head drive element, 6...
...Scanning trajectory correction waveform generator, 7...Adder.
Claims (2)
キングを行なうべく再生回転ヘッドをヘッド駆動素子に
よって変任させるようにした自動トラッキング回路を具
備し、かつ前記再生高周波信号の出力が、あらかじめ乱
れることが予想される期間は自動トラッキング動作を停
止し、停止前のトラッキング情報を保持し、通常のトラ
ッキング動作に戻る時には前記保持情報より開始するよ
うに構成したことを特徴とする自動トラッキング装置。(1) An automatic tracking circuit is provided in which the reproducing rotary head is shifted by a head driving element in order to automatically perform tracking based on the information of the reproduced high-frequency signal, and the output of the reproduced high-frequency signal is determined in advance. An automatic tracking device characterized in that the automatic tracking operation is stopped during a period when disturbances are expected, the tracking information before the stop is held, and when returning to normal tracking operation, the automatic tracking operation is started from the held information.
予想される期間はビデオテープレコーダにおける再生速
度モードの変更時であることを特徴とする特許請求の範
囲第０）項記載の自動トラッキング装置。(2) The automatic tracking device according to claim 0, wherein the period during which the reproduction high-frequency signal output is expected to be disturbed is when the reproduction speed mode of the video tape recorder is changed.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56179473A JPS5883325A (en) | 1981-11-09 | 1981-11-09 | Automatic tracking device |
| US06/439,712 US4590523A (en) | 1981-11-09 | 1982-11-04 | Control of auto-tracking in tracking-error correcting system of video recording/reproducing apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56179473A JPS5883325A (en) | 1981-11-09 | 1981-11-09 | Automatic tracking device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5883325A true JPS5883325A (en) | 1983-05-19 |
| JPS6349287B2 JPS6349287B2 (en) | 1988-10-04 |
Family
ID=16066455
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP56179473A Granted JPS5883325A (en) | 1981-11-09 | 1981-11-09 | Automatic tracking device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5883325A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63229653A (en) * | 1987-03-19 | 1988-09-26 | Mitsubishi Electric Corp | Detection of head output waveform level for magnetic picture recording and reproducing device |
-
1981
- 1981-11-09 JP JP56179473A patent/JPS5883325A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63229653A (en) * | 1987-03-19 | 1988-09-26 | Mitsubishi Electric Corp | Detection of head output waveform level for magnetic picture recording and reproducing device |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6349287B2 (en) | 1988-10-04 |
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