JPH0132706B2 - - Google Patents
Info
- Publication number
- JPH0132706B2 JPH0132706B2 JP55070970A JP7097080A JPH0132706B2 JP H0132706 B2 JPH0132706 B2 JP H0132706B2 JP 55070970 A JP55070970 A JP 55070970A JP 7097080 A JP7097080 A JP 7097080A JP H0132706 B2 JPH0132706 B2 JP H0132706B2
- Authority
- JP
- Japan
- Prior art keywords
- speed
- signal
- recording
- phase
- rotary head
- 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
Links
- 238000001514 detection method Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 2
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/76—Television signal recording
- H04N5/78—Television signal recording using magnetic recording
- H04N5/782—Television signal recording using magnetic recording on tape
- H04N5/783—Adaptations for reproducing at a rate different from the recording rate
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
Description
【発明の詳細な説明】
本発明は、回転ヘツドにより磁気テープの長手
方向に対して傾斜した記録軌跡として、順次１フ
イールドの信号を記録再生するヘリカルスキヤン
方式の磁気録画再生装置（VTR）に関するもの
で、再生時に、記録時のテープ走行速度より速い
速度でテープを正あるいは逆方向に走行せしめ、
クイツクモーシヨン像として再生する際に良好な
再生画像が得られるよう構成したものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a helical scan type magnetic recording and reproducing apparatus (VTR) that sequentially records and reproduces one field of signals as a recording trajectory inclined with respect to the longitudinal direction of a magnetic tape using a rotating head. During playback, the tape is run in the forward or reverse direction at a faster speed than the tape running speed during recording.
The structure is such that a good reproduced image can be obtained when reproduced as a quick motion image.
周知のように、ヘリカルスキヤン方式のVTR
において、再生時にテープ速度を変化せしめても
再生画像が得られる。 As is well known, helical scan VTR
In this case, a reproduced image can be obtained even if the tape speed is changed during reproduction.
しかし、この場合、１つの回転ヘツドの１回の
走査時に複数の記録トラツクを順次横切つて再生
することとなるため、再生信号に間欠的に欠落が
生じる。 However, in this case, since a plurality of recording tracks are sequentially traversed and reproduced during one scan of one rotary head, the reproduced signal is intermittently missing.
本発明は、この欠落位置を常に再生画面の所定
の位置に固定することにより、良好な再生画像を
得んとするものである。 The present invention aims to obtain a good reproduced image by always fixing the missing position at a predetermined position on the reproduced screen.
第１図は、互に異なるアジマス角度を有する２
個の回転ヘツドＡ，Ｂよりなるヘリカムスキヤン
方式のVTRの記録軌跡の一例を模式的に示すも
ので、Ａは回転ヘツドＡによる記録軌跡を、Ｂは
回転ヘツドＢによる記録軌跡を示し、Ｃはコント
ロール信号を示している。今、かかる磁気テープ
を再生時にそのテープ速度を９倍にして再生する
と、回転ヘツドＡおよびＢの再生軌跡はＤ，Ｅの
ようになる。 Figure 1 shows two
This figure schematically shows an example of the recording trajectory of a helicam scan VTR consisting of two rotating heads A and B, where A indicates the recording trajectory by rotating head A, B indicates the recording trajectory by rotating head B, and C. indicates a control signal. Now, if such a magnetic tape is reproduced by increasing the tape speed by nine times, the reproduction trajectories of rotary heads A and B become as shown by D and E.
すなわち、回転ヘツドＡとＢの再生信号は、図
面にハツチングで示す位置に相当する区間得られ
ることとなり、間欠的に無信号区間が生じ、この
無信号区間は再生画面上にそれぞれ一体の線とな
つて現れる。 In other words, the reproduced signals of rotary heads A and B are obtained in sections corresponding to the hatched positions in the drawing, and there are intermittent no-signal sections, and these no-signal sections are each shown as a line on the playback screen. Appears with age.
本発明は、この再生画面上の無信号区間の位置
を固定せんとするもので、以下図面を参照して、
その一実施例を説明する。 The present invention aims to fix the position of this no-signal section on the playback screen, and with reference to the drawings below:
An example of this will be explained.
第２図は、本発明の一実施例を示すもので、１
は回転ヘツド駆動用モータであり、その回転速度
に応じた周波数の信号を発生する周波数発電機２
の出力を速度制御回路３に印加し、従来公知の構
成により、モータ駆動回路４を介して所定の速度
で回転駆動される。 FIG. 2 shows one embodiment of the present invention.
is a motor for driving a rotating head, and a frequency generator 2 generates a signal with a frequency corresponding to the rotation speed of the motor.
is applied to the speed control circuit 3, and is driven to rotate at a predetermined speed via the motor drive circuit 4 using a conventionally known configuration.
また、回転位相検出器５により、モータ１の回
転位相を検出し、増巾器６を介して、位相比較器
７に印加し、記録時には、切換スイツチSW1の
REC端子を介して印加される記録すべき映像信
号中の垂直同期信号を1/2分周した出力と位相比
較され、その位相差にもとづく信号を切換スイツ
チSW2のRECおよびPB端子を介して前記速度制
御回路３に印加して、位相制御を行う。 Furthermore, the rotational phase of the motor 1 is detected by the rotational phase detector 5, and applied to the phase comparator 7 via the amplifier 6. At the time of recording, the rotational phase of the motor 1 is
The phase is compared with the output obtained by dividing the vertical synchronization signal in the video signal to be recorded applied via the REC terminal by 1/2, and the signal based on the phase difference is output via the REC and PB terminals of switch SW 2 . The voltage is applied to the speed control circuit 3 to perform phase control.
すなわち、速度制御回路３はスイツチSW2を介
して印加される信号電圧に応じて、その設定速度
が可変されるよう構成されている。 That is, the speed control circuit 3 is configured so that its set speed can be varied in accordance with the signal voltage applied via the switch SW2 .
８はキヤプスタンモータであり、周波数発電機
９の出力を増巾器１０を介して速度制御回路７に
印加して、モータ駆動回路１２を介してモータ８
を所定の速度で回転駆動する。 8 is a capstan motor, which applies the output of the frequency generator 9 to the speed control circuit 7 via the amplifier 10, and applies the output of the frequency generator 9 to the speed control circuit 7 via the motor drive circuit 12.
is rotated at a predetermined speed.
また、増巾器１０の出力を通常の記録再生時に
は30Hzの信号が得られるよう第１の分周器１３に
より分周し、その分周出力をスイツチSW3の
REC端子、第２の分周器（通常記録再生時の分
周比は１）１４を介して位相比較器１５に印加し
切換スイツチSW4のREC ＆ PB端子を介して
得られた前記第１の切換スイツチSW1の出力と位
相比較し、その位相差に応じて速度制御回路１１
を制御して、キヤプスタンモータ８の回転を垂直
同期信号に位相同期せしめている。 In addition, the output of the amplifier 10 is frequency-divided by the first frequency divider 13 so that a 30Hz signal is obtained during normal recording and reproduction, and the frequency-divided output is sent to the switch SW 3 .
The first signal is applied to the phase comparator 15 via the REC terminal and the second frequency divider (the division ratio during normal recording and reproduction is 1) 14, and is obtained via the REC & PB terminals of the switch SW 4 . The phase is compared with the output of the changeover switch SW 1 , and the speed control circuit 11 is adjusted according to the phase difference.
is controlled so that the rotation of the capstan motor 8 is phase-synchronized with the vertical synchronization signal.
なお、この記録時には、回転ヘツドの回転位相
に位相同期した信号、例えば、回転位相検出器５
の出力はコントロールヘツドによりテープ端にコ
ントロール信号（第１図ｃ）として記録されてい
る。通常再生時には、第１の切換スイツチSW1お
よび第３の切換スイツチSW3がそれぞれPB端子
に切換えられ、垂直同期信号に代え、基準発振器
１６の出力30Hzが、また、第１の分周器１３の出
力に代えコントロールヘツド１７の再生コントロ
ール信号が印加されるよう構成されている。 Note that during this recording, a signal phase-synchronized with the rotational phase of the rotary head, for example, the rotational phase detector 5
The output of the control head is recorded as a control signal (FIG. 1c) at the end of the tape. During normal playback, the first changeover switch SW 1 and the third changeover switch SW 3 are each switched to the PB terminal, and instead of the vertical synchronization signal, the output 30Hz of the reference oscillator 16 is also output to the first frequency divider 13. The reproduction control signal of the control head 17 is applied instead of the output of the control head 17.
以上の通常記録再生時の動作は、キヤプスタン
制御方式の従来のVTRと同一である。 The above normal recording and reproducing operations are the same as those of a conventional capstan control type VTR.
次の本発明の特徴である高速再生時の動作およ
び構成について説明する。 Next, the operation and configuration during high-speed reproduction, which is a feature of the present invention, will be explained.
再生時に、テープ速度を記録時の整数倍（実施
例では９倍）にして再生をする場合、第２の切換
スイツチSW2をCue端子に切換え、一定電圧を速
度制御回路３に印加してヘツドモータ１の回転速
度を記録時の速度より低下（磁気テープの走行方
向と同一の方向に回転ヘツドが回転する場合）せ
しめ、記録時の回転ヘツドと磁気テープの相対速
度と、高速再生時の相対速度とを略々一致せしめ
る。 During playback, if the tape speed is set to an integral multiple of the recording speed (9 times in this example), the second changeover switch SW 2 is switched to the Cue terminal, and a constant voltage is applied to the speed control circuit 3 to control the head motor. 1 is lower than the speed during recording (when the rotating head rotates in the same direction as the running direction of the magnetic tape), and the relative speed between the rotating head and the magnetic tape during recording and the relative speed during high-speed playback. and roughly match.
そして、この回転ヘツドの回転位相を、前記回
転位相検出器５より取り出し、増巾器６、第４の
切換スイツチSW4を介して位相比較器１５に導
き、一方、コントロールヘツド１７よりの再生コ
ントロール信号を分周器１４を介して前記位相比
較器１５に印加する。 Then, the rotational phase of this rotary head is extracted from the rotational phase detector 5 and guided to the phase comparator 15 via the amplifier 6 and the fourth changeover switch SW4 , while the control head 17 controls the reproduction. The signal is applied to the phase comparator 15 via a frequency divider 14.
この時、前記分周器１４の分周比は1/9に設定
されている。 At this time, the frequency division ratio of the frequency divider 14 is set to 1/9.
この位相比較器１５の出力で、キヤププスタン
モータ８の回転位相を制御する。 The output of the phase comparator 15 controls the rotational phase of the cap stan motor 8.
すなわち、回転ヘツドの回転位相に同期して、
キヤプスタンモータ８は回転するため、テープ上
のヘツドＡ，Ｂの走査軌跡は互に平行なものとな
り、再生画像上における無信号区間は常に一定位
置に固定される。 In other words, in synchronization with the rotational phase of the rotating head,
Since the capstan motor 8 rotates, the scanning trajectories of the heads A and B on the tape are parallel to each other, and the no-signal section on the reproduced image is always fixed at a constant position.
また、再生時にテープを逆方向に記録時の９倍
のスピードで高速走行せしめて再生する場合は、
切換スイツチSW2とReview端子に切換えて、そ
の状態において回転ヘツドとテープとの相対速度
を一定に切換えることにより所期の目的は達成で
きる。 Also, if you want to playback by running the tape in the reverse direction at 9 times the recording speed,
The desired purpose can be achieved by switching the changeover switch SW 2 to the Review terminal and, in that state, changing the relative speed between the rotating head and the tape to a constant value.
なお、分周器１４の分周比の切換は、再生時の
テープスピードと記録時のスピードとの比によつ
て決定されるもので、ｎ倍のスピードで再生する
時には記録時の１／ｎに設定される。 The switching of the frequency division ratio of the frequency divider 14 is determined by the ratio of the tape speed during playback and the speed during recording. is set to
以上のように本発明によれば、高速度再生時に
回転ヘツドと磁気テープとの相対速度が、記録時
のそれと略等しくなるように回転ヘツドを回転さ
せ、この回転ヘツドの回転位相によりキヤプスタ
ンモータの位相及び速度を制御する構成としたこ
とにより、回転ヘツドがトラツクを横切る時に発
生する雑音圧間を再生画面上の一定位置に固定す
ることができ、さらに回転ヘツドの回転むらに対
しても十分高精度に制御可能であるため、雑音圧
間があつても見易い品質のよい画像を得ることが
できる。 As described above, according to the present invention, the rotary head is rotated so that the relative speed between the rotary head and the magnetic tape during high-speed reproduction is approximately equal to that during recording, and the rotational phase of the rotary head is used to control the capstan. By controlling the phase and speed of the motor, it is possible to fix the noise pressure generated when the rotating head crosses the track at a constant position on the playback screen, and also to prevent uneven rotation of the rotating head. Since it can be controlled with sufficiently high precision, it is possible to obtain a high-quality image that is easy to see even if there is a noise pressure difference.
第１図は、テープ上の記録軌跡と再生時のヘツ
ド走査軌跡を示す図、第２図は本発明の一実施例
を示すブロツク図である。
１……ヘツドモータ、３，１１……速度制御回
路、５……回転位相検出器、７，１５……位相比
較器、３，１４……分周器、１７……コントロー
ルヘツド。
FIG. 1 is a diagram showing a recording trajectory on a tape and a head scanning trajectory during reproduction, and FIG. 2 is a block diagram showing an embodiment of the present invention. 1... Head motor, 3, 11... Speed control circuit, 5... Rotation phase detector, 7, 15... Phase comparator, 3, 14... Frequency divider, 17... Control head.
Claims (1)
号に同期せしめて回転ヘツドを回転駆動せしめ
て、走行する磁気テープに前記回転ヘツドによ
り、その磁気テープの長手方向に傾斜した記録軌
跡として順次映像信号を記録するとともに、前記
回転ヘツドの回転位相に関係する信号を磁気テー
プ端に順次コントロール信号として記録し、再生
時に磁気テープの走行速度を記録時のｎ倍（ｎは
２以上の整数）にして、高速度再生を行う磁気録
画再生装置であつて、高速度再生時における前記
回転ヘツドと前記磁気テープの相対速度を記録時
の相対速度に略等しくさせる一定電圧を第１の位
相比較器の出力信号に代えて前記回転ヘツドの速
度制御系に印加する第１の切換手段と、高速度再
生時に第２の切換手段を介して前記回転ヘツドの
回転位相検出器の検出出力を一方の入力とする第
２の位相比較器と、再生コントロール信号を１／
ｎ分周しその出力を前記第２の位相比較器の他方
の入力とする分周器とを備え、前記第２の位相比
較器により、前記回転ヘツドの回転位相検出器の
検出出力と再生コントロール信号を１／ｎ分周し
た出力との位相比較を行ない、その結果の出力を
キヤプスタンモータの速度制御系に印加して回転
ヘツドの回転位相によりキヤプスタンモータの速
度と回転位相を制御する構成としたことを特徴と
する磁気録画再生装置。1. During recording, a rotary head is driven to rotate in synchronization with a vertical synchronization signal of a video signal to be recorded, and the video signal is sequentially recorded onto a running magnetic tape by the rotary head as a recording trajectory inclined in the longitudinal direction of the magnetic tape. At the same time, signals relating to the rotational phase of the rotary head are sequentially recorded as control signals at the end of the magnetic tape, and during playback, the running speed of the magnetic tape is multiplied by n times that of recording (n is an integer of 2 or more). , a magnetic recording and reproducing apparatus that performs high-speed playback, wherein a constant voltage is outputted from a first phase comparator to make the relative speed between the rotary head and the magnetic tape substantially equal to the relative speed during recording during high-speed playback; A first switching means applies the signal to the speed control system of the rotary head in place of the signal, and a detection output of the rotational phase detector of the rotary head is used as one input through a second switching means during high-speed reproduction. A second phase comparator and a reproduction control signal of 1/
a frequency divider that divides the frequency by n and inputs its output as the other input of the second phase comparator, and the second phase comparator outputs the detected output of the rotary phase detector of the rotary head and controls playback. Compare the phase with the output obtained by dividing the signal by 1/n, apply the resulting output to the capstan motor speed control system, and control the speed and rotation phase of the capstan motor according to the rotation phase of the rotating head. A magnetic recording/playback device characterized by having a configuration in which:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7097080A JPS56166678A (en) | 1980-05-28 | 1980-05-28 | Magnetic video recording and reproducing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7097080A JPS56166678A (en) | 1980-05-28 | 1980-05-28 | Magnetic video recording and reproducing device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS56166678A JPS56166678A (en) | 1981-12-21 |
| JPH0132706B2 true JPH0132706B2 (en) | 1989-07-10 |
Family
ID=13446882
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7097080A Granted JPS56166678A (en) | 1980-05-28 | 1980-05-28 | Magnetic video recording and reproducing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS56166678A (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59144058A (en) * | 1983-02-07 | 1984-08-17 | Matsushita Electric Ind Co Ltd | Tracking system of magnetic video recording and reproducing device |
| JPS6056940U (en) * | 1983-09-26 | 1985-04-20 | 日本ビクター株式会社 | Reference signal switching device for servo circuit in recording and reproducing equipment |
| DE3522935A1 (en) * | 1985-06-27 | 1987-01-08 | Thomson Brandt Gmbh | VIDEO RECORDER |
| DE3522934A1 (en) * | 1985-06-27 | 1987-01-08 | Thomson Brandt Gmbh | VIDEO RECORDER |
| JP3440539B2 (en) * | 1994-03-22 | 2003-08-25 | 矢崎総業株式会社 | Connector terminal locking structure and method of manufacturing terminal fitting |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS53143305A (en) * | 1977-05-20 | 1978-12-13 | Victor Co Of Japan Ltd | Magnetic recording and reproducing system |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5822277Y2 (en) * | 1975-11-01 | 1983-05-12 | ソニー株式会社 | Video tape recorder Capstan server voice recorder |
| JPS5355512U (en) * | 1976-10-13 | 1978-05-12 |
-
1980
- 1980-05-28 JP JP7097080A patent/JPS56166678A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS53143305A (en) * | 1977-05-20 | 1978-12-13 | Victor Co Of Japan Ltd | Magnetic recording and reproducing system |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS56166678A (en) | 1981-12-21 |
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