JPS61150122A - Tracking device - Google Patents
Tracking deviceInfo
- Publication number
- JPS61150122A JPS61150122A JP27180684A JP27180684A JPS61150122A JP S61150122 A JPS61150122 A JP S61150122A JP 27180684 A JP27180684 A JP 27180684A JP 27180684 A JP27180684 A JP 27180684A JP S61150122 A JPS61150122 A JP S61150122A
- Authority
- JP
- Japan
- Prior art keywords
- head
- control signal
- tracking control
- tracking
- displacement
- 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
-
- 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
- G11B5/5921—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 using auxiliary signals, e.g. pilot signals
- G11B5/5922—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 using auxiliary signals, e.g. pilot signals superimposed on the main signal
Landscapes
- Adjustment Of The Magnetic Head Position Track Following On Tapes (AREA)
Abstract
Description
【発明の詳細な説明】
〔発明の技術分野〕
この発明は回転ヘッド型ビデオテープレコーダのような
磁気記録再生装置におけるトラッキング装置に関する。DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a tracking device in a magnetic recording/reproducing device such as a rotary head type video tape recorder.
近年、回転ヘッド型のビデオテープレフーダ（以ｒ１回
転ヘッド型ＶＴＲと称する）においテハ、ノ４／４Ｑッ
ト方式なるトラッキング方式ｄｆ開発されている。この
方式は、ビデオトラックにビデオ信号とともＫ ’−，
’、” ／臂イロット信号を１ｃ！祿しておき、このパ
イロット信号の再生出力を基に、再生ヘッドのトラッキ
ングずれに応じた極性及びレベルをもつトラッキング制
御信号を作シ、このトラッキング制御信号に従って再生
ヘッドのトラッキングを制御するものである。In recent years, a tracking method called 4/4 Qt method has been developed for rotating head type video tape recorders (hereinafter referred to as r1 rotating head type VTR). In this method, K'-,
','' / 1C! The pilot signal is removed, and based on the reproduced output of this pilot signal, a tracking control signal having a polarity and level corresponding to the tracking deviation of the reproduction head is created, and according to this tracking control signal. This controls the tracking of the playback head.
・ｆイσット信号としては、例えば周波数の異なる４つ
の信号がア）、これらがそれぞれ各ビデオトラックに１
つずつ循環的に記鎌されるようＫなつている。・For example, as the f-it signal, there are four signals with different frequencies (a), and one of these is assigned to each video track.
K is arranged so that it is recorded in a circular manner one by one.
上記トラッキング制御信号による再生ヘッドのトラッキ
ング制御は、一般には、キャプスタンモータの回転速度
の制御によって行われる◇ま九、回転ヘッド型ＶＴＲに
よりては、再生ヘッドをビデオトラックの幅方向または
アジマス方向に変位可能なように配置し、同方向く対す
る再生ヘッドの変化をトラッキング制御信号に従って制
御することＫより、再生ヘッドのトラッキングを制御す
るものもある。後者は、いわゆるＤＴＰ＠能と云われ、
再生ヘッドを圧電変位素子上に配置し、この圧電変位素
子に対する印加電圧をトラッキング制御信号に従って制
御することにより、再生ヘッドを変位させるよう忙なっ
ている。Tracking control of the playback head using the above-mentioned tracking control signal is generally performed by controlling the rotational speed of the capstan motor. ◇In some rotating head type VTRs, the playback head is moved in the width direction or azimuth direction of the video track. There is also a device that controls the tracking of the reproducing head by disposing the reproducing head so that it can be displaced and controlling the change of the reproducing head in the same direction according to a tracking control signal. The latter is called DTP@Noh,
The read head is disposed on a piezoelectric displacement element and the read head is displaced by controlling the voltage applied to the piezoelectric displacement element in accordance with a tracking control signal.
〔宵景技術・の・間バ關Ｏ侍−１，〕
ところで、トラッキング制御方式としてパイミツト方式
を採シ、しかも上述したようなりＴＰａＩ能を備えた回
転へラドＩＪＩＶ’ｒＲＩＣおいて、上記トラッキング
制御信号の低域成分でキャプスタンモータの回転速度を
制御し、高域成分で再生ヘッドの変位を制御するようＫ
して回転ヘッドのトラッキングを制御することが提案さ
れている。[Yoikei Techniques/Intermediate Barrel O Samurai-1] By the way, the tracking control method is adopted as the tracking control method, and the above-mentioned tracking control is carried out in the rotary head IJIV'rRIC equipped with the TPaI function as described above. The low-frequency component of the signal controls the rotation speed of the capstan motor, and the high-frequency component controls the displacement of the playback head.
It has been proposed to control the tracking of a rotating head by
この構成にあっては、外乱等による再生ヘッドの変位、
あるいは上記圧電変位素子に存在するヒステリシスによ
る再生ヘッドの残留変位を無くすために、再生ヘッドが
磁気テープＩＩｃ接触していない期間、圧電変位素子に
減衰振動を与えるようになっている。In this configuration, displacement of the reproducing head due to disturbance, etc.
Alternatively, in order to eliminate residual displacement of the reproducing head due to hysteresis existing in the piezoelectric displacement element, damped vibration is applied to the piezoelectric displacement element during a period when the reproducing head is not in contact with the magnetic tape IIc.
しかし、上記の如く、再生ヘッドの不要変位を無くす構
成にありては、そのための専用の回路が必要になり、ま
た、減衰振動が磁気テープに接触している再生ヘッドに
伝播し、再生画面にジッタを生じさせることがある。However, as mentioned above, in a configuration that eliminates unnecessary displacement of the playback head, a dedicated circuit is required for this purpose, and the damped vibrations propagate to the playback head that is in contact with the magnetic tape, causing the playback screen to disappear. This may cause jitter.
この発明は上記の事情に対処すべくなされたもので、再
生ヘッドの不要変位を専用の回路を設けることなく、か
つ磁気テープに！！！触中の再生ヘッドに悪影響を与え
ることなく、除去することができるトラッキング装置を
提供することを目的とする。This invention was made in order to deal with the above-mentioned situation, and eliminates unnecessary displacement of the playback head without providing a dedicated circuit and on a magnetic tape! ! ! An object of the present invention is to provide a tracking device that can be removed without adversely affecting a reproducing head that is being touched.
この発明は、一方の再生ヘッドの／４イロット信号の再
生出力に従って得られるトラッキング制御信号の低域成
分をその再生ヘッドの変位制御信号に加えるととくよシ
、不要変位を無くすものである。This invention specifically eliminates unnecessary displacement by adding the low-frequency component of the tracking control signal obtained in accordance with the reproduction output of the /4-lot signal of one reproduction head to the displacement control signal of that reproduction head.
以下、図面を参照してこの発明の実施例を詳ｍＫ説明す
る。Embodiments of the present invention will be described in detail below with reference to the drawings.
ａｄこの発明の一実施例の構成を示す回路図で、２個の
再生ヘッド個々にトラッキング制御信号を生成する回路
を備えたトラッキング装置Ｋｊｌ用した場合を代表とし
て示す。ad This is a circuit diagram showing the configuration of an embodiment of the present invention, and shows as a representative case a tracking device Kjl equipped with a circuit for generating a tracking control signal for each of two playback heads.
図において、再生ヘッド１１．１２の再生出力はそれぞ
れ、プリアンプＪ Ｊ 、 Ｊ ４に供給される。但し
、再生ヘッド１１．１２が記録５ツドと兼用される場合
は、記録／再生切換えスイッチ會介して供給される。プ
リアンプ１３．１４の出力はそれぞれトラッキング制御
信号生成回＠Ｉ Ｊ 、 １１ｊＫ供給されるとともに
、この図には示さないビデオ信号処理回路に与えられる
◇トラッキング制御信号生成回路１５．１６はパイロッ
ト信号の再生出力からトラッキング制御信号を作る。ト
ラッキング制御信号生成回路１５で生成されたトラッキ
ング制御信号ａ へイノ４スフイルタ１７ｒｌｌＣ供給
されるとともに１スイッチング回Ｗ＆ １ ｇ Ｋ供給
される。トラッキング制御信号生成回路ＩＣで構成され
たトラッキング制御信号はへイ／４Ｆスフイルタ１９に
供給されるとともに、スイッチング回路１８に供給され
る０
へイー１４スフイルタ１７．１９はそれぞれ入力信号か
ら高域成分を取シ出し、ヘッド駆動回路２ｏ、２１に供
給する。ヘッド駆動回路２０゜２ノはそれぞれへイノ譬
スフイルタ１１．１９から与えられるトラッキング制御
信号の高域成分に従ってヘッド１１．１２を支持する圧
電変位素子の駆動電圧を発生し、ヘッド１１．１２のト
ラックの幅方向またはアジマス方向の変位を制御する。In the figure, the reproduction outputs of the reproduction heads 11, 12 are supplied to preamplifiers J J and J 4, respectively. However, if the reproducing heads 11 and 12 are also used as recording heads, they are supplied through a recording/reproducing switch. The outputs of the preamplifiers 13 and 14 are supplied to tracking control signal generation circuits @I J and 11jK, respectively, and are also given to a video signal processing circuit not shown in this figure. ◇The tracking control signal generation circuits 15 and 16 reproduce the pilot signal. Create a tracking control signal from the output. The tracking control signal a generated by the tracking control signal generation circuit 15 is supplied to the inno-four filter 17rllC and is also supplied one switching time W&1gK. The tracking control signal configured by the tracking control signal generation circuit IC is supplied to the H/4F filter 19, and the 0H/4F filters 17 and 19, which are supplied to the switching circuit 18, extract high frequency components from the input signal. It is taken out and supplied to the head drive circuits 2o and 21. Each of the head drive circuits 20.2 generates a drive voltage for a piezoelectric displacement element that supports the head 11.12 in accordance with the high-frequency component of the tracking control signal given from the analog filter 11.19, and tracks the head 11.12. control the displacement in the width direction or azimuth direction.
スイッチング回路１８はトラッキング制御信号生成回路
１５．１６から出力されるトラッキング制御信号をヘッ
ド１１．１２の回転位相に同期したヘッドスイッチング
／４ルスＰ易に従って連続信号に変換する。ロー／ヤス
フィルタ２２はこのトラッキング制御信号の連続信号か
ら低域成分を抽出し、キャプスタンモータの駆勤口゛
路（図示せず）に与える。これにより、キャプスタン
モータの回転速度がトラッキング制御信号の低域成分に
従って制御されることになる。The switching circuit 18 converts the tracking control signal outputted from the tracking control signal generation circuit 15.16 into a continuous signal according to head switching/4 pulses synchronized with the rotational phase of the head 11.12. The low/earth filter 22 extracts the low frequency component from the continuous tracking control signal, and extracts the low frequency component from the continuous signal of the tracking control signal.
(not shown). Thereby, the rotational speed of the capstan motor is controlled according to the low frequency component of the tracking control signal.
なお、へイノ中スフイルタｌｆｌ、１８０代ＭＫｓパン
トノやスフィルタによ〕、トラッキング制御信号の高域
成分を抽出するようＫしてもよい。Note that the high-frequency components of the tracking control signal may be extracted by using a heino medium filter, a 180's MKs pantone filter, or a 180's MKs pantone filter.
また、トラッキング制御信号の低域成分の連続信号を得
るには、スイッチング回路１８の前にロー／ヤスフィル
タを設けるようＫしてもよい。Further, in order to obtain a continuous signal of the low frequency component of the tracking control signal, a low/yas filter may be provided before the switching circuit 18.
次にこの発明の特徴とする動作を説明するθ上記再生ヘ
ッド１１で再生された／ＪＰイロット信号に従ってトラ
ッキング制御信号を出力するトラッキング制御信号生成
回路１５の出力はロー／ヤスフィルタ２３に供給される
。ａ−ノ譬スフィルタ２３は例えば入力部にスイッチン
グ回路を有し、上記ヘッドスイッチングノ臂ルスＰｉに
従って再生ヘッド１１が磁気テープに接触している期間
だけ、トラッキング制御信号生成回路１５の出力ｔａｂ
込むようＫなっている。そして、取シ込んだトラッキン
グ制御信号の低域成分を抽出し、これをヘッド駆動回路
２０１１Ｃ供給するようになっている。これによ）、再
生ヘッド１１は七のＩｆイロット信号再生出力に従って
得られたトラッキング制御信号の高域成分だけ゛でなく
、低域成分によっても変位が制御される。Next, the characteristic operation of the present invention will be explained.θ The output of the tracking control signal generation circuit 15, which outputs a tracking control signal according to the /JP pilot signal reproduced by the reproduction head 11, is supplied to the low/yas filter 23. . The a-nose filter 23 has, for example, a switching circuit in its input section, and outputs the output TAB of the tracking control signal generation circuit 15 only during the period when the reproducing head 11 is in contact with the magnetic tape according to the head switching pulse Pi.
It is set to K so that it will be crowded. Then, the low-frequency component of the input tracking control signal is extracted and supplied to the head drive circuit 2011C. As a result, the displacement of the reproducing head 11 is controlled not only by the high frequency component but also by the low frequency component of the tracking control signal obtained in accordance with the If pilot signal reproduction output in step 7.
なお、ヘッド駆動回路ｊ７に供給される信号・８人は再
生ヘッド１ノの変位を初期設定する丸めのバイアス信号
である。Note that the signal supplied to the head drive circuit j7 is a rounded bias signal that initializes the displacement of the reproduction head 1.
また、ロー／ヤスフィルタ２３の特性はσ−ノやスフィ
ルタ２２の特性と異なっても構わない。Further, the characteristics of the low/yas filter 23 may be different from the characteristics of the σ-nos filter 22.
さらに、 ロー／ヤスフィルタ２３のスイツ′チング回
路管制御する信号としては、ヘッドスイッチング−母ル
スＰｓに限らず、再生ヘッド１１が磁気テープに接触し
そいる期間だけ、スイッチング回路がトラッキング制御
信号生成回路１５の出力を取シ込むように、このスイッ
チング回路を制御することにより、Ｏ−／ヤスフィルタ
２３の出力が再生ヘッド１１が磁気テープＩＩＣ接触し
ていない期間の信号Ｋｍりて影響されないようＫするも
のであればよい０
以上詳述し九この実施例によれば、２つの再生ヘッド１
１．１２のうちの一方のヘッド１１の再生出力に従うて
得られたトラッキング制御信号の低域成分をそのヘッド
駆動回路２０にフィードバックするようＫしたので、不
要変位除去用の専用の回路を設けた）、再生ＷＩ像にジ
ッタを生じることなく、外乱やヒステリシスによる不要
−位による段差を解消することができる。Furthermore, the signal for controlling the switching circuit of the low/yas filter 23 is not limited to the head switching master pulse Ps, but the switching circuit is used by the tracking control signal generating circuit only during the period when the reproducing head 11 is about to come into contact with the magnetic tape. By controlling this switching circuit so as to receive the output of 15, the output of the O-/Yas filter 23 is prevented from being affected by the signal Km during the period when the reproducing head 11 is not in contact with the magnetic tape IIC. According to this embodiment, two playback heads 1
1. Since the low-frequency component of the tracking control signal obtained in accordance with the playback output of one of the heads 11 is fed back to the head drive circuit 20, a dedicated circuit for removing unnecessary displacement is provided. ), it is possible to eliminate steps caused by unnecessary positions due to disturbances and hysteresis without causing jitter in the reproduced WI image.
なお、この発明は、キャプスタンモータの回転速度の制
御を、先の図で言えば、再生ヘッド１２゛の再生出力に
従□っ゛て得られるトラッキング制御信号の低域成分に
よつてのみ行うよりにしてもよい。この場合もトラッキ
ング制御信号生成回路１６の出力をそのままロー／ヤス
フィルタ２２に供給するのではなく、再生へラド１２が
磁気テープに接触している期間だけ与えるようＫすれば
、ヘッド１２が磁気テープに接触していない期間におけ
るトラッキング制御信号生成回路１６の出力の影響を取
シ除くことができる。In addition, in the present invention, the rotational speed of the capstan motor is controlled only by the low-frequency component of the tracking control signal obtained according to the reproduction output of the reproduction head 12, as shown in the previous figure. It may be better. In this case as well, instead of directly supplying the output of the tracking control signal generation circuit 16 to the low/earth filter 22, if the output is supplied only during the period when the RAD 12 is in contact with the magnetic tape, then the head 12 can It is possible to eliminate the influence of the output of the tracking control signal generation circuit 16 during the period when the contact is not made.
ま九、この発明は、プリアンプ１３，１４の出力を択一
的に選択するスイッチング回路やへイパスフィルタの出
力をヘッドＩ［勤口１１ｊ ０ 。(9) In the present invention, the output of a switching circuit or a high-pass filter that selectively selects the outputs of the preamplifiers 13 and 14 is connected to the head I [function 11j 0 ].
２１に振プ分けるスイッチング回路を設けることにより
、１つのトラッキング制御信号生成回路やへイパスフィ
ルタを再生ヘッド１１．１２で兼用する構成のトラッキ
ング制御装置でも適用可能である。By providing a switching circuit for distributing signals to the recording heads 11 and 21, it is possible to apply the present invention to a tracking control apparatus in which the reproduction heads 11 and 12 share a single tracking control signal generation circuit and a high-pass filter.
このようにこの発明によれば、専用の回路を設けたシ、
磁気テープに接触中の再生ヘッドに悪影響管与えること
なく、再生ヘッドの不要変位を除去することができる。As described above, according to the present invention, a system provided with a dedicated circuit,
Unnecessary displacement of the reproducing head can be removed without adversely affecting the reproducing head while it is in contact with the magnetic tape.
ト、ラゲ湾ン）郊装置を提供することができる。We can provide the following equipment:
図はこの発明の一実施例の構成を示す回路図である。 The figure is a circuit diagram showing the configuration of an embodiment of the present invention.
Claims (1)
１つずつ循環的に記録された周波数の異なる複数のパイ
ロット信号の再生出力を基に、一対の再生ヘッドのトラ
ッキングのずれに応じた極性及びレベルをもつトラッキ
ング制御信号を生成し、このトラッキング制御信号に従
って再生ヘッドのトラックの幅方向あるいはアジマス方
向の変位並びにキャプスタンモータの回転速度を制御す
ることにより、トラッキングずれを修正するトラッキン
グ装置において、上記トラッキング制御信号の高域成分
によって上記再生ヘッドの上記変位を制御する第１の制
御手段と、 上記一対の再生ヘッドの一方の再生ヘッドによるパイロ
ット信号の再生出力に従って得られたトラッキング制御
信号の低域成分に従って該一方の再生ヘッドの上記変位
を制御する第２の制御手段と、 少なくとも上記一対の再生ヘッドの他方の再生ヘッドに
よるパイロット信号の再生出力に従って得られたトラッ
キング制御信号の低域成分に従って上記キャプスタンモ
ータの回転速度を制御する第３の制御手段とを具備した
トラッキング装置。[Claims] In each information signal track of the magnetic tape, along with an information signal,
Based on the reproduction output of a plurality of pilot signals having different frequencies that are cyclically recorded one by one, a tracking control signal having a polarity and level corresponding to the tracking deviation of a pair of reproduction heads is generated, and this tracking control signal is generated. In a tracking device that corrects tracking deviation by controlling the displacement of the playback head in the width direction or azimuth direction of the track and the rotational speed of the capstan motor, the displacement of the playback head is corrected by the high-frequency component of the tracking control signal. a first control means for controlling the displacement of one of the pair of reproduction heads, and a first control means for controlling the displacement of one of the pair of reproduction heads according to a low frequency component of a tracking control signal obtained in accordance with a reproduction output of a pilot signal by one of the pair of reproduction heads. and a third control means for controlling the rotational speed of the capstan motor in accordance with a low frequency component of a tracking control signal obtained in accordance with the reproduction output of a pilot signal by at least the other reproduction head of the pair of reproduction heads. A tracking device comprising:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27180684A JPS61150122A (en) | 1984-12-25 | 1984-12-25 | Tracking device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27180684A JPS61150122A (en) | 1984-12-25 | 1984-12-25 | Tracking device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS61150122A true JPS61150122A (en) | 1986-07-08 |
Family
ID=17505106
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP27180684A Pending JPS61150122A (en) | 1984-12-25 | 1984-12-25 | Tracking device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61150122A (en) |
-
1984
- 1984-12-25 JP JP27180684A patent/JPS61150122A/en active Pending
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