JPS61240786A - Magnetic recording and reproducing device - Google Patents

Magnetic recording and reproducing device

Info

Publication number
JPS61240786A
JPS61240786A JP60083128A JP8312885A JPS61240786A JP S61240786 A JPS61240786 A JP S61240786A JP 60083128 A JP60083128 A JP 60083128A JP 8312885 A JP8312885 A JP 8312885A JP S61240786 A JPS61240786 A JP S61240786A
Authority
JP
Japan
Prior art keywords
signal
recording
time axis
frequency
magnetic recording
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
Application number
JP60083128A
Other languages
Japanese (ja)
Inventor
Yasuhiro Oomori
大森　靖泰
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP60083128A priority Critical patent/JPS61240786A/en
Priority to DE19863613230 priority patent/DE3613230A1/en
Publication of JPS61240786A publication Critical patent/JPS61240786A/en
Pending legal-status Critical Current

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
    • H04N5/78—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
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B15/00—Driving, starting or stopping record carriers of filamentary or web form; Driving both such record carriers and heads; Guiding such record carriers or containers therefor; Control thereof; Control of operating function
    • G11B15/18—Driving; Starting; Stopping; Arrangements for control or regulation thereof
    • G11B15/1808—Driving of both record carrier and head
    • G11B15/1875—Driving of both record carrier and head adaptations for special effects or editing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/79—Processing of colour television signals in connection with recording
    • H04N9/87—Regeneration of colour television signals
    • H04N9/877—Regeneration of colour television signals by assembling picture element blocks in an intermediate memory
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B15/00—Driving, starting or stopping record carriers of filamentary or web form; Driving both such record carriers and heads; Guiding such record carriers or containers therefor; Control thereof; Control of operating function
    • G11B15/18—Driving; Starting; Stopping; Arrangements for control or regulation thereof
    • G11B15/46—Controlling, regulating, or indicating speed
    • G11B15/467—Controlling, regulating, or indicating speed in arrangements for recording or reproducing wherein both record carriers and heads are driven
    • G11B15/4671—Controlling, regulating, or indicating speed in arrangements for recording or reproducing wherein both record carriers and heads are driven by controlling simultaneously the speed of the tape and the speed of the rotating head

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Television Signal Processing For Recording (AREA)

Abstract

PURPOSE:To eliminate the need for a specific monitor and complicated motor controller and obtain definite slow pictures without making any noise by using usual video heads by carrying out a satisfactory step driving in opposition to inertia occurring in case of a motor rotation. CONSTITUTION:When reproduction is executed in slow motion mode running speeds of a magnetic tape and the number of revolution of a rotary head are controlled forward directionwise to 1/n times those in case of recording and reverse directionwise to 1/m times those in case of recording by using a control means. Signals of a magnetic head 2 reproduced in such a condition are preamplified by a head-amplifier 3 and are written to a field image memory 8 after performing a A/D conversion 7 by a 1/nf clock. Reads from the memory 8 and writes to a field image memory 10 as well as writes to the memory 8 are repeatedly carried out in a period of one field. And outputs from memories 9 and 10 are converted D/A-wise by a D/A converter 11 through a switch 12 and these converted outputs are processed by a reproducing luminance signal processing circuit 4 and a reproducing chrominance signal processing circuit 5 and then the definite slow pictures are outputted by using a usual video head.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明はヘリカルスキャン方式磁気記録再生装置におい
て、映像のフィールド欠落のない連続フィールドで、か
つノイズのない完全なスローモーション再生画像が得ら
れる装置に関するものである。[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a helical scan type magnetic recording and reproducing device that can obtain complete slow-motion reproduced images in continuous fields without missing video fields and without noise. It is related to.

〔従来の技術〕[Conventional technology]

従来のノイズレス・スローモーション再生を行なう装置
の代表的なもの２つを第７図及び第８図に従って説明す
る。Two typical conventional devices for performing noiseless slow motion playback will be explained with reference to FIGS. 7 and 8.

まずその１つは、磁気テープを走行させるキャプスタン
・モータを連続的に回転させるのではなく、回転−停止
一回転−停止→・・・を繰り返す、いわゆるステップ駆
動を行なって、通常再生画一静止画一通常再生画一静止
画→・・・の繰り返しを行ないスローモーション再生と
するものである。そしてこの方式の装置では、静止画再
生時にブレがないよう、またノイズレスとなるよう静止
画専用のビデオヘッドをも有する特殊なデオヘッドが装
備されており、スロー再生時にそれらが完全なタイミン
グで切換え制御されるようになっている。First, the capstan motor that runs the magnetic tape does not rotate continuously, but instead performs so-called step drive, which repeats rotation-stop, rotation-stop, and so on. A still image, a normal playback image, a still image, and so on are repeated for slow motion playback. This type of device is equipped with a special video head that also has a video head dedicated to still images so that there is no blurring or noise when playing still images, and these are switched and controlled at perfect timing during slow playback. It is now possible to do so.

このような装置のスローモーション再生時における、磁
気テープパターン上の各ビデオヘッドの走査軌道、及び
その時のヘッドから出力される映像信号の出力エンベロ
ープを第７図に示す。図中、■は磁気テープ、２０はビ
デオトラック、Ｈｌ。FIG. 7 shows the scanning trajectory of each video head on the magnetic tape pattern and the output envelope of the video signal output from the heads at the time of slow motion playback of such an apparatus. In the figure, ■ is a magnetic tape, 20 is a video track, and Hl.

Ｈ２は静止画期間におけるビデオヘッドの軌跡、Ｅは再
生出力エンベローブであり、ＴＩ、Ｔ３は静止画、即ち
同一フィールドが繰り返し再生される期間、Ｔ２は通常
再生期間（１フレーム送り）を示している。H2 is the trajectory of the video head during the still image period, E is the reproduction output envelope, TI and T3 are the still images, that is, the period in which the same field is repeatedly reproduced, and T2 is the normal reproduction period (one frame forwarding). .

また他の１つは、上述のようにキャプスタンモータをス
テップ駆動させ、特殊ビデオヘッドを用いるという代わ
りに、画像メモリを用いてスロー再生を行なうものであ
る。即ち、磁気テープを記録時の１／ｎ倍で連続駆動さ
せながら、適当なノイズレスの映像出力の得られるフィ
ールドのみを抜き取って離散的に映像信号を画像メモリ
に記憶し、残りのフィールドについては上記画像メモリ
の出力にて映像信号を補関し、スロー再生を行なうもの
である。Another method is to step-drive the capstan motor and perform slow playback using an image memory instead of using a special video head as described above. That is, while the magnetic tape is continuously driven at 1/n times the recording speed, only the field that provides a suitable noiseless video output is extracted and the video signal is discretely stored in the image memory, and the remaining fields are stored in the image memory as described above. The video signal is interpolated at the output of the image memory to perform slow playback.

このような装置のスロー再生時におけるビデオヘッドの
走査軌跡とビデオヘッドから出力される映像信号の出力
エンベローブ波形を第８図に示す。FIG. 8 shows the scanning locus of the video head and the output envelope waveform of the video signal output from the video head during slow playback of such an apparatus.

図中、第７図と同一符号は同一部分を示し、期間Ｔ４で
得られるフィールドの映像信号が画像メモリに書き込ま
れ、これ以後の期間Ｔ５、即ち次の完全なエンベロープ
の得られるフィールドまでの期間は、上記画像メモリ内
に記憶されたにフィールドの画面が繰り返し表示される
。In the figure, the same reference numerals as in FIG. 7 indicate the same parts, and the video signal of the field obtained in period T4 is written into the image memory, and the period thereafter is T5, that is, the period until the next field in which a complete envelope is obtained. The screen of the field stored in the image memory is repeatedly displayed.

〔発明が解決しようとする問題点〕[Problem that the invention seeks to solve]

従来の装置は以上のように構成されており、前者の装置
では、モータ回転時にその慣性に抗して満足なステップ
駆動をさせるための、特殊なモータ及び複雑なモータ制
御装置が必要であり、さらに静止画再生時にブレとノイ
ズのない画像を得るための特殊なビデオヘッド及びその
制御に複雑な装置が必要であるという欠点があった。ま
た、後者の装置では、テープ走行スピードが遅いために
通常のビデオヘッドでは満足なノイズレスの信号を読み
込むことが困難であり、また得られたスローモーション
画像が、フィールドを間引いて合成された非連続画面で
あるためスムーズなものでないという欠点があった。The conventional device is constructed as described above, and the former device requires a special motor and a complicated motor control device to provide a satisfactory step drive against the inertia of the motor when it rotates. Another drawback is that a special video head and a complicated device are required to control the video head in order to obtain an image free from blur and noise when reproducing still images. In addition, with the latter device, due to the slow tape running speed, it is difficult to read a satisfactorily noiseless signal with a normal video head, and the resulting slow-motion image is a non-continuous image that is synthesized by thinning out fields. Since it is a screen, it has the disadvantage that it is not smooth.

この発明は、かかる欠点を除去するためになされたもの
で、通常のビデオヘッドを使用して全くノイズのない、
鮮明でスムーズなスロー画面が得られる磁気記録再生装
置を提供することを目的としている。This invention was made in order to eliminate such drawbacks, and uses a normal video head to produce completely noise-free video.
The purpose of the present invention is to provide a magnetic recording/reproducing device that can provide clear and smooth slow-motion images.

〔実施例〕〔Example〕

ここで、本発明の詳細な説明する前に、本発明の基本原
理を第６図に従って説明する。第６図はヘリカルスキャ
ン方式の磁気記録再生装置の磁気テープ走行速度と、ド
ラム回転によるビデオヘッドと磁気テープの相対速度と
の関係を示したベクトル図である。Before explaining the present invention in detail, the basic principle of the present invention will be explained with reference to FIG. 6. FIG. 6 is a vector diagram showing the relationship between the magnetic tape running speed of a helical scan type magnetic recording and reproducing apparatus and the relative speed between the video head and the magnetic tape due to drum rotation.

まず第６図（ａ）において、ｖｈはテープが速度Ｖｔで
動くときのビデオヘッドと磁気テープの相対速度であり
、ｖｈとＶｔのなす角度θでビデオヘソドが走査し、磁
気テープ上に映像信号が記録される。角度θＯは、テー
プが停止（Ｖｔ−０）しているときのビデオヘッドの走
査軌跡であり、これはドラムの傾き角に相当する。この
ときの相対速度をＶｈｏとする。このとき、図よりθと
００との間に なる関係式が成立している。First, in Fig. 6(a), vh is the relative speed between the video head and the magnetic tape when the tape moves at a speed Vt, and the video head scans at the angle θ formed by vh and Vt, and the video signal is recorded on the magnetic tape. recorded. The angle θO is the scanning locus of the video head when the tape is stopped (Vt-0), and corresponds to the inclination angle of the drum. Let the relative velocity at this time be Vho. At this time, from the figure, a relational expression between θ and 00 is established.

いま、ドラムの回転数を１／ｎ倍（ｎ−２，３゜・・・
）にし、テープ走行速度Ｖｔも１　／　ｎ倍にすると、
相対速度ｖｈも元の１　／　ｎ倍になる。このことは第
６図中）に示す、ドラム回転数Ｖｈｏとテープ速度Ｖｔ
を１／ｆｉ倍にしたときのベクトル関係から明らかとな
る。即ち、ＶｈｏとＶｔとｖｈとで囲まれた三角形で、
ＶｈｏとＶｔがともに１／ｎ倍になると、θＯは不変ゆ
え第６図中）の両三角形は相似となり、ｖｈも１　／　
ｎ倍になる。ここで、Ｖｈｏはテープ停止時の相対速度
であるが、これはドラム回転数に比例するので、説明の
便宜上ドラム回転数をＶｈｏとして表わしている。Now, increase the rotation speed of the drum by 1/n (n-2, 3°...
) and the tape running speed Vt is also multiplied by 1/n,
The relative velocity vh also becomes 1/n times the original value. This is explained by the drum rotational speed Vho and tape speed Vt shown in Figure 6).
This becomes clear from the vector relationship when is multiplied by 1/fi. That is, a triangle surrounded by Vho, Vt, and vh,
When Vho and Vt both become 1/n times, since θO remains unchanged, both triangles (in Figure 6) become similar, and vh also becomes 1/n.
It becomes n times. Here, Vho is the relative speed when the tape is stopped, but since this is proportional to the drum rotation speed, for convenience of explanation, the drum rotation speed is expressed as Vho.

とすると、θと００との関係式はやはり、１／ｎ　−ｖ
ｈ−ｃｏｓ　θ＋１／ｎ−Ｖｔ　　　Ｖｈ−ｃｏｓ　θ
＋Ｖｔ冨ｔａｎθ０ が成立し、磁気テープの本来のビデオトラック上を並行
に角度θで走査することがわかる。即ち、すべてのビデ
オトラックを忠実に走査できることを意味する。Then, the relational expression between θ and 00 is still 1/n −v
h-cos θ+1/n-Vt Vh-cos θ
It can be seen that +Vt-tan θ0 is established and the original video track of the magnetic tape is scanned in parallel at an angle θ. This means that all video tracks can be scanned faithfully.

但し、出力される映像信号の繰り返し周期、例えば水平
同期信号と次の水平同期信号との間隔はｎ倍になってい
る。However, the repetition period of the output video signal, for example, the interval between one horizontal synchronization signal and the next horizontal synchronization signal, is multiplied by n.

以上の議論は、磁気テープが上記・例と逆方向に走行す
るようなヘリカルスキャン方式磁気記録再生装置におい
ても同様に成り立つ、この場合は、速度が−Ｖｔで、θ
Ｏ〉θとなる。The above discussion holds true in a helical scan type magnetic recording/reproducing device in which the magnetic tape runs in the opposite direction to that in the above example. In this case, the speed is -Vt and θ
O>θ.

本発明は上記原理に基づいてなされたもので、第１図に
その第１の実施例を示す０図において、１は磁気テープ
、２は磁気ヘッドであり、その出力にはＦＭ輝度信号及
び低域変換色信号の合成信号が得られる。また、本実施
例においては、スローモーシラン再生時に、テープ走行
速度及びドラム回転速度（回転数）は図示しない制御手
段によって記録時の１　／　ｎ倍に制御される。３は前
置増幅器であり、その周波数補償特性は再生される信号
周波数に応じて最も適した特性となるよう図示しない切
換回路によって切換えられるようになっている。即ち本
実施例の場合、１　／　ｎ倍速の“ｎ″の値によって回
転ドラムの回転数が変化する訳であるが、それに応じて
再生される信号の周波数帯域が変化するので、その再生
される信号の周波数帯域に最も適した周波数補償特性で
もって再生信号が増幅されるようになっている。The present invention has been made based on the above principle, and in FIG. 1 shows a first embodiment thereof, 1 is a magnetic tape, 2 is a magnetic head, and the output thereof includes an FM brightness signal and a low A composite signal of gamut-converted color signals is obtained. Further, in this embodiment, during slow motion reproducing, the tape running speed and drum rotation speed (rotation speed) are controlled to 1/n times the recording speed by a control means (not shown). Reference numeral 3 denotes a preamplifier, the frequency compensation characteristics of which are switched by a switching circuit (not shown) so as to provide the most suitable characteristics according to the signal frequency to be reproduced. That is, in the case of this embodiment, the number of revolutions of the rotating drum changes depending on the value of "n" which is 1/n times the speed, and the frequency band of the reproduced signal changes accordingly, so the frequency band of the reproduced signal changes accordingly. The reproduced signal is amplified with frequency compensation characteristics most suitable for the frequency band of the signal.

また、７は周波数１／ｎ−ｆＣＬＫのクロックで動作す
るＡ／Ｄ変換器、８は画像メモリＡ、１０は画像メモリ
Ｂ、９はこれ゛らのメモリＡ、Ｈの書込み、読出しを制
御するメモリ制御回路、１１は周波数ｆ　ＣＬＫのクロ
ックで動作するＤ／Ａ変換器、１２はメモリＡの読出し
時はメモリＡ側に、メモＩＪ　Ｂの読出し時はメモリＢ
側に接続される切換スイッチである。そして、上記Ａ／
Ｄ変換器７．メモリＡ、　Ｂ、メモリ制御回路９．Ｄ／
Ａ変換器１１、及び切換スイッチ１２により、再生信号
を時間軸圧縮する時間軸圧縮手段と、この時間軸圧縮手
段からの出力のない期間に映像信号を補間する補間手段
とが構成されている。Further, 7 is an A/D converter that operates with a clock of frequency 1/n-fCLK, 8 is image memory A, 10 is image memory B, and 9 controls writing and reading of these memories A and H. Memory control circuit, 11 is a D/A converter that operates with a clock of frequency f CLK, 12 is connected to memory A side when reading memory A, and to memory B when reading memo IJB.
This is a selector switch connected to the side. And the above A/
D converter7. Memories A, B, memory control circuit 9. D/
The A converter 11 and the changeover switch 12 constitute a time-base compression means for time-base compressing the reproduced signal, and an interpolation means for interpolating the video signal during a period in which there is no output from the time-base compression means.

４は上記の時間軸圧縮手段及び補間手段により得られた
ＦＭ輝度信号及び低域変換色信号の合成信号が入力され
、輝度信号の再生処理、即ち周波数復調を行なう再生輝
度信号処理回路であり、該回路４の時定数等は“１／ｎ
倍速”のｎの値に応じて切換えられるようになっている
。５は上記合成信号が入力され、色信号の再生処理、即
ち周波数高域変換を行なう再生色信号処理回路、６は上
記周波数復調された輝度信号と周波数高域変換された色
信号とを合成する混合器である。また図示していないが
、回転ドラムの回転数及び磁気テーブの走行速度に応じ
て、各モータＷＩ御系の制御特性、例えばサーボ特性の
時定数等を切換える制御手段が設けられており、これに
よりどのようなスローモーション再生時にもヘッドが正
しくトランクを追跡するよう構成されている。4 is a reproduced luminance signal processing circuit to which a composite signal of the FM luminance signal and low-frequency conversion color signal obtained by the above-mentioned time axis compression means and interpolation means is input, and performs reproduction processing of the luminance signal, that is, frequency demodulation; The time constant etc. of the circuit 4 is "1/n
5 is a reproduced color signal processing circuit to which the above synthesized signal is input and performs color signal reproduction processing, that is, frequency high-frequency conversion; 6 is a reproduction color signal processing circuit for performing the above frequency demodulation. This is a mixer that synthesizes the luminance signal obtained by converting the luminance signal and the color signal obtained by converting the frequency to high frequency range.Also, although not shown, the output of each motor WI control system is controlled depending on the rotation speed of the rotating drum and the running speed of the magnetic tape. A control means is provided for switching control characteristics, such as a time constant of a servo characteristic, so that the head can correctly track the trunk during any slow motion playback.

次に動作について説明する。Next, the operation will be explained.

第２図は第１図の画像メモリＡ、　Ｂの書込み／読出し
のタイミングを説明する図であり、このタイミングチャ
ート図に従って、スローモーション再生時の動作を説明
する。FIG. 2 is a diagram for explaining the writing/reading timing of the image memories A and B in FIG. 1, and the operation during slow motion playback will be explained according to this timing chart.

スローモーション再生時は、前述の如くドラム回転数及
び磁気テープ走行速度が記録時の１／ｎ倍に速度制御さ
れる。第２図ではｎ＝３の場合を示している。このよう
な状態で再生された信号は前置増幅器３で増幅され、Ａ
／Ｄ変換器７に入力される。このＡ／Ｄ変換器７では、
入力された再生映像信号がクロック周波数（１／ｎ）　
　・ｆ　ＣＬＫでＡ／Ｄ変換され、該データはメモリＡ
に書込まれる。ここで、上記周波数ｆ　ＣＬＫは処理す
る信号の周波数帯域を考慮して決定される。このとき、
再生速度が記録時のｌ／ｎになっているので、第２図に
示すように、再生信号の１フイールドの周期はｎＶであ
る。但し、■は本来のフィールド繰り返し周波数である
。このうち、書き込み開始から（ｎ−１）Ｖだけ時間が
経過したときにメモリＡの読み出しが開始される。この
ときクロック周波数ｆＣＬＫ、即ちＡ／Ｄ変換の際のｎ
倍のクロック周波数で読み出される。これと同時に、メ
モリＡの読み出し出力はメモリＢにクロック周波数ｆＣ
ＬＫで書き込まれる。即ち、メモリＡの書込みとメモリ
Ａの読出しとメモリＢの書込みの３つの処理はこのフィ
ールドに関しては同時に終了する。During slow motion playback, the drum rotational speed and magnetic tape running speed are controlled to 1/n times the speed during recording, as described above. FIG. 2 shows the case where n=3. The signal reproduced in this state is amplified by the preamplifier 3, and A
/D converter 7. In this A/D converter 7,
The input playback video signal has a clock frequency (1/n)
・A/D conversion is performed at f CLK, and the data is stored in memory A
written to. Here, the frequency f CLK is determined in consideration of the frequency band of the signal to be processed. At this time,
Since the playback speed is l/n during recording, the period of one field of the playback signal is nV, as shown in FIG. However, ■ is the original field repetition frequency. Among these, reading from the memory A is started when a time period of (n-1)V has elapsed from the start of writing. At this time, the clock frequency fCLK, that is, n at the time of A/D conversion
Read at twice the clock frequency. At the same time, the read output of memory A is sent to memory B at the clock frequency fC.
Written in LK. That is, the three processes of writing to memory A, reading from memory A, and writing to memory B are completed at the same time regarding this field.

映像信号のに番目に関してこの操作が終了すれば、メモ
リＡには続けて次の（ｋ＋１）番目のフィールドの書込
みが行なわれる。When this operation is completed for the second field of the video signal, the next (k+1)th field is successively written to the memory A.

その後の動作は、前述のに番目の場合の動作の繰り返し
である。但し、メモリＡから読み出しが開始されるまで
は、メモリＢから書き込みと同じクロック周波数ｆ　Ｃ
ＬＫで（ｎ−１）回繰り返してデータが読み出される。The subsequent operation is a repetition of the operation in the second case described above. However, until reading starts from memory A, the clock frequency f C is the same as that used for writing from memory B.
Data is read out repeatedly (n-1) times in LK.

このようにして得られたメモリＡの読出し出力とメモリ
Ｂの読出し出力とはそれぞれ切換スイッチ１２を介して
クロック周波数ｆ　ＣＬＫで動作するＤ／Ａ変換器１２
に入力され、ここでＤ／Ａ変換される。The readout output of memory A and the readout output of memory B obtained in this way are respectively transmitted via a changeover switch 12 to a D/A converter 12 operating at a clock frequency f CLK.
The signal is input into the , and is subjected to D/A conversion here.

そしてこの信号は再生輝度信号処理回路４及び再生色信
号処理回路５に入力され、それぞれの回路で周波数復調
１周波数高域変換がなされた後、混合器６で混合されて
複合映像信号として出力される。This signal is then input to a reproduced luminance signal processing circuit 4 and a reproduced chrominance signal processing circuit 5, and after frequency demodulation and high frequency conversion are performed in each circuit, the signals are mixed in a mixer 6 and output as a composite video signal. Ru.

このような本実施例では、スローモーション再生時にテ
ープスピード及び回転ヘッドドラムの回転数を記録時の
１　／　ｎ倍に制御するようにしたので、ヘッドはトラ
ック上を忠実に走査することになり、通常のビデオヘッ
ドを使用して全くノイズのない鮮明な任意の１／ｎ倍速
のスロー画面が得られる。また再生信号を時間軸圧縮し
て出力すると同時に、この時間軸圧縮した出力が得られ
ない期間については、補間手段により、上記時間軸圧縮
した出力と同一の信号を出力して補間するようにしたの
で、連続した画面が得られ、鮮明なスムーズなスロー画
面が得られる。In this embodiment, the tape speed and the number of revolutions of the rotary head drum are controlled to 1/n times the recording speed during slow motion playback, so the head faithfully scans the track. Using a normal video head, you can obtain a clear slow screen at any 1/n speed with no noise. Furthermore, at the same time as the playback signal is compressed in the time axis and outputted, during a period when the compressed output in the time axis cannot be obtained, the same signal as the output compressed in the time axis is outputted by the interpolation means for interpolation. Therefore, you can get a continuous screen and a clear, smooth slow-motion screen.

第３図は本発明の第２の実施例を示し、この実施例は、
再生輝度信号処理回路４及び再生色信号処理５を時間軸
圧縮手段及び補間手段の前段に設け、輝度信号１色信号
とも再生信号処理された後の合成された複合映像信号を
遅延操作する場合の構成例である。FIG. 3 shows a second embodiment of the invention, which includes:
The reproduced luminance signal processing circuit 4 and the reproduced color signal processing circuit 5 are provided before the time axis compression means and the interpolation means, and when performing delay operations on the synthesized composite video signal after both the luminance signal and one color signal have been subjected to reproduction signal processing. This is a configuration example.

この実施例における各部の動作はそれぞれ上記実施例の
動作と同様であり、その効果についても上記実施例と同
様の効果を奏する。The operation of each part in this embodiment is the same as that in the above embodiment, and the same effects as in the above embodiment are achieved.

また第４図は本発明の第３の実施例を示しこれは輝度信
号用の時間軸圧縮手段及び補間手段と、色信号用の時間
軸圧縮手段及び補間手段とをそれぞれ独立して設け、周
波数復調後の輝度信号と低域変換色信号とをそれぞれ独
立に遅延操作する場合の構成例である。FIG. 4 shows a third embodiment of the present invention, in which time-base compression means and interpolation means for luminance signals and time-base compression means and interpolation means for color signals are provided independently, and This is an example of a configuration in which a demodulated luminance signal and a low-frequency conversion color signal are independently delayed.

この実施例では、上記第１．第２の実施例に比較しメモ
リ等の個数は増加するが、各時間軸圧縮手段及び補間手
段に入力される輝度信号１色信号はともに低い周波数と
なっており、従ってＡ／Ｄ変換、Ｄ／Ａ変換のクロック
周波数が低い周波数でよ（、このためＡ／Ｄ、Ｄ／Ａ変
換器は高級なものを使用する必要がなく、コスト低下を
図ることができる。また、この実施例により得られるス
ロー画面は上記各実施例と同様であり、全くノイズのな
い、鮮明でスムーズなものとなる。In this embodiment, the above 1. Although the number of memories etc. is increased compared to the second embodiment, the luminance signal and one color signal input to each time axis compression means and interpolation means both have a low frequency, so A/D conversion, D Since the clock frequency of A/A conversion is low (therefore, there is no need to use high-grade A/D and D/A converters, cost reduction can be achieved. The slow-motion screen that is displayed is the same as in each of the above embodiments, and is completely noise-free, clear and smooth.

さらに上記各実施例では順方向にスローモーション再生
を行なう場合、即ち“ｌ／ｎ倍速”のｎが正整数の場合
について説明したが、これはｎ−−２，−３，・・・の
場合、即ちドラム回転とテープ走行とを共に逆方向にし
た場合にも前記の場合と同様の考え方によりビデオトラ
ックを忠実に走査できる。但し、出力される映像信号の
繰り返し周期は逆方向に２倍、３倍、・・・となってい
る。Furthermore, in each of the above embodiments, the case where slow motion playback is performed in the forward direction, that is, the case where n in "l/n times speed" is a positive integer, has been described, but this is the case where n--2, -3, . . . That is, even when the drum rotation and tape running are both reversed, the video track can be scanned faithfully using the same concept as in the above case. However, the repetition period of the output video signal is doubled, tripled, etc. in the opposite direction.

この場合は、第５図のタイミングチャートに示すように
、メモリＡの読出しを逆方向から、即ち最後に書込んだ
ものから順次行なうことにより逆方向スローモーション
再生が実現できる。そしてこのような場合にも、上記各
実施例と同様に、全くノイズのない鮮明でスムーズなス
ロー画面が得られる。In this case, as shown in the timing chart of FIG. 5, by reading out the memory A from the reverse direction, that is, sequentially from the last written data, it is possible to realize slow motion playback in the reverse direction. Even in such a case, a clear and smooth slow-motion screen completely free of noise can be obtained, as in each of the above embodiments.

そしてさらに、逆方向に走行させる場合の特殊の場合と
してｎｚ−１とすることも考えられ、この場合は、メモ
リＢなしでつまりメモリＡのみでノイズレスでスムーズ
な逆方向再生を行なうことができる。Further, as a special case when running in the reverse direction, nz-1 may be considered, and in this case, noiseless and smooth reverse playback can be performed without memory B, that is, with only memory A.

〔発明の効果〕〔Effect of the invention〕

以上のように、本発明によれば、スローモーション再生
時に磁気テープの走行速度とともに回転ヘッドドラムの
回転数をも記録時の１／ｎ倍として信号を再生し、これ
により得られた再生信号を時間軸圧縮手段により時間軸
圧縮して出力すると同時に、該手段の出力のない期間に
同一出力を繰り返し出力して映像信号を補間するように
したので、ビデオヘッドが磁気テープ上のビデオトラッ
クを忠実に走査することとなり、通常のビデオヘッドを
使用して全くノイズのない鮮明でスムーズなスロー画面
が得られる効果がある。As described above, according to the present invention, during slow-motion reproduction, the running speed of the magnetic tape and the rotational speed of the rotary head drum are set to 1/n times the recording speed to reproduce the signal, and the reproduced signal obtained thereby is At the same time as the time axis compression means compresses the time axis and outputs it, the video signal is interpolated by repeatedly outputting the same output during the period when the means does not output, so that the video head can faithfully reproduce the video track on the magnetic tape. This has the effect of providing a clear, smooth slow-motion screen with no noise at all using a normal video head.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は本発明の第１の実施例による磁気記録再生装置
のブロック構成図ζ第２図は該装置の動作を説明するた
めのタイミングチャート図、第３図は本発明の第２の実
施例を示す図、第４図は本発明の第３の実施例を示す図
、第５図は本発明装置を逆方向再生した場合のタイミン
グチャート図、第６図はテープ速度とテープ、ヘッドの
相対速度とそれらの角度の関係を示す図、第７図は従来
の４ヘッド方式によるスロー再生時の磁気テープ上のビ
デオトラックとビデオヘッド走査軌跡及び再生出力エン
ベロープを示す説明図、第８図は従来の２ヘッド十画像
メモリ方式によるスロー再生時の磁気テープ上のビデオ
トラックとビデオヘッド走査軌跡及び再生出力エンベロ
ープを示す説明図である。 １・・・磁気テープ、２・・・ビデオヘッド、３・・・
再生前置増幅器、４・・・再生輝度信号処理回路（周波
数復調器等）、５・・・再生色信号処理回路（高域変換
器等）、６・・・混合器、７・・・Ａ／Ｄ変換器、８・
・・フィールド画像メモリＡ、９・・・メモリ制御回路
、１０・・・フィールド画像メモリＢ、１１・・・Ｄ／
Ａ変換器、１２・・・スイッチ。 なお図中同一符号は同−又は相当部分を示す。FIG. 1 is a block configuration diagram of a magnetic recording/reproducing device according to a first embodiment of the present invention. FIG. 2 is a timing chart diagram for explaining the operation of the device, and FIG. 3 is a block diagram of a magnetic recording/reproducing device according to a first embodiment of the present invention. FIG. 4 is a diagram showing a third embodiment of the present invention; FIG. 5 is a timing chart when the device of the present invention is used for reverse playback; and FIG. FIG. 7 is an explanatory diagram showing the video track on the magnetic tape, the video head scanning trajectory, and the playback output envelope during slow playback using the conventional four-head system. FIG. 3 is an explanatory diagram showing a video track on a magnetic tape, a video head scanning locus, and a reproduction output envelope during slow reproduction using a conventional two-head image memory system. 1...Magnetic tape, 2...Video head, 3...
Reproducing preamplifier, 4... Reproducing luminance signal processing circuit (frequency demodulator, etc.), 5... Reproducing color signal processing circuit (high frequency converter, etc.), 6... Mixer, 7... A /D converter, 8.
...Field image memory A, 9...Memory control circuit, 10...Field image memory B, 11...D/
A converter, 12... switch. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (6)

【特許請求の範囲】[Claims] （１）ヘリカルスキャン方式の磁気記録再生装置におい
て、スローモーション再生時に磁気テープ走行速度及び
回転ヘッドドラムの回転数を順方向に記録時のそれの１
／ｎ倍（ｎは２以上の整数）に、又は逆方向に記録時の
それの１／ｍ倍（ｍは１以上の整数）に制御する制御手
段と、スローモーション再生時の映像信号処理系に設け
られ遅延量可変の遅延手段を有し再生信号を時間軸圧縮
する時間軸圧縮手段と、同じく映像信号処理系に設けら
れ上記時間軸圧縮手段からの出力のない期間に同一出力
を繰り返し出力することによって映像出力信号を補間す
る補間手段とを備えたことを特徴とする磁気記録再生装
置。(1) In a helical scan type magnetic recording and reproducing device, the magnetic tape running speed and rotational speed of the rotary head drum during slow motion playback are equal to those during forward recording.
/n times (n is an integer of 2 or more) or 1/m times (m is an integer of 1 or more) the recording time in the opposite direction, and a video signal processing system during slow motion playback. A time axis compression means which is provided in the video signal processing system and has a delay means with a variable delay amount and compresses the time axis of the reproduced signal, and a time axis compression means which is also provided in the video signal processing system and repeatedly outputs the same output during a period when there is no output from the time axis compression means. 1. A magnetic recording and reproducing apparatus comprising: interpolation means for interpolating a video output signal by interpolating a video output signal. （２）上記時間軸圧縮手段及び補間手段は、被周波数変
調輝度信号と低域変換色信号との合成信号を処理するも
のであることを特徴とする特許請求の範囲第１項記載の
磁気記録再生装置。(2) The magnetic recording according to claim 1, wherein the time axis compression means and the interpolation means process a composite signal of a frequency modulated luminance signal and a low frequency converted color signal. playback device. （３）上記時間軸圧縮手段及び補間手段は、周波数復調
された輝度信号と周波数高域変換された色信号とが合成
された複合映像信号を処理するものであることを特徴と
する特許請求の範囲第１項記載の磁気記録再生装置。(3) The above-mentioned time axis compression means and interpolation means process a composite video signal in which a frequency demodulated luminance signal and a frequency high-frequency converted color signal are combined. The magnetic recording and reproducing device according to scope 1. （４）上記時間軸圧縮手段及び補間手段は、周波数復調
された輝度信号と低域変換された信号とを独立に処理す
るものであることを特徴とする特許請求の範囲第１項記
載の磁気記録再生装置。(4) The magnetic field according to claim 1, wherein the time axis compression means and the interpolation means independently process the frequency demodulated luminance signal and the low frequency converted signal. Recording and playback device. （５）上記制御手段は、回転ドラムの回転数に応じて再
生前置増幅器の周波数補償特性をも切換えるものである
ことを特徴とする特許請求の範囲第１項ないし第４項の
いずれかに記載の磁気記録再生装置。(5) According to any one of claims 1 to 4, the control means also switches the frequency compensation characteristic of the regenerative preamplifier in accordance with the rotational speed of the rotating drum. The magnetic recording and reproducing device described above. （６）上記制御手段は、回転ドラムの回転数及び磁気テ
ープの走行速度に応じて各モータ制御系の制御特性をも
切換えるものであることを特徴とする特許請求の範囲第
１項ないし第５項のいずれかに記載の磁気記録再生装置
。(6) Claims 1 to 5 are characterized in that the control means also switches the control characteristics of each motor control system according to the rotational speed of the rotating drum and the running speed of the magnetic tape. The magnetic recording/reproducing device according to any one of the items.
JP60083128A 1985-04-18 1985-04-18 Magnetic recording and reproducing device Pending JPS61240786A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP60083128A JPS61240786A (en) 1985-04-18 1985-04-18 Magnetic recording and reproducing device
DE19863613230 DE3613230A1 (en) 1985-04-18 1986-04-18 Magnetic video recorder/player

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP60083128A JPS61240786A (en) 1985-04-18 1985-04-18 Magnetic recording and reproducing device

Publications (1)

Publication Number Publication Date
JPS61240786A true JPS61240786A (en) 1986-10-27

Family

ID=13793559

Family Applications (1)

Application Number Title Priority Date Filing Date
JP60083128A Pending JPS61240786A (en) 1985-04-18 1985-04-18 Magnetic recording and reproducing device

Country Status (2)

Country Link
JP (1) JPS61240786A (en)
DE (1) DE3613230A1 (en)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0294959B1 (en) * 1987-06-09 1994-10-05 Sony Corporation Television standards converters
DE3853555T2 (en) * 1987-06-09 1995-08-17 Sony Corp Processing of the motion vector in digital television pictures.
EP0294955B1 (en) * 1987-06-09 1995-04-12 Sony Corporation Motion vector estimation in television images
EP0294956B1 (en) * 1987-06-09 1994-07-20 Sony Corporation Motion vector reduction in television images
DE3854337T2 (en) * 1987-06-09 1996-02-01 Sony Corp Motion compensated interpolation of digital television pictures.
EP0294960B1 (en) * 1987-06-09 1994-09-28 Sony Corporation Motion vector processing in television images
EP0294962B1 (en) * 1987-06-09 1995-07-19 Sony Corporation Motion vector estimation in television images
DE3851786T2 (en) * 1987-06-09 1995-03-09 Sony Corp Selection of a motion vector in television pictures.
GB8722704D0 (en) * 1987-09-26 1987-11-04 Quantel Ltd Processing video signals
GB2223141A (en) * 1988-09-21 1990-03-28 Sony Corp Slow motion video signal generator with motion compensated interpolation
EP2385527A3 (en) 1993-06-07 2012-12-19 Samsung Electronics Co., Ltd. Digital information recording-reproducing apparatus
JP3271092B2 (en) * 1993-06-08 2002-04-02 ソニー株式会社 Recording / reproducing device and reproducing device
US6157391A (en) * 1994-01-10 2000-12-05 International Business Machines Corporation Method and apparatus for providing slow motion video at normal motion play speed

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2646899C2 (en) * 1976-10-18 1985-03-21 Robert Bosch Gmbh, 7000 Stuttgart Method for playing back video signals recorded on magnetic tape
JPS54138324A (en) * 1978-04-19 1979-10-26 Sony Corp Magnetic recording and reproducing unit

Also Published As

Publication number Publication date
DE3613230C2 (en) 1989-07-20
DE3613230A1 (en) 1986-10-30

Similar Documents

Publication Publication Date Title
JPH01258255A (en) Magnetic recording and/or reproducing device
JPS61240786A (en) Magnetic recording and reproducing device
US4930024A (en) Variable speed magnetic medium recording and playback apparatus
JPS6221387A (en) Variable speed reproducing device for video tape recorder
JP2737182B2 (en) Variable speed playback of audio data
JPS5948818A (en) Magnetic video recording and reproducing device
JPS6229956B2 (en)
JP2553031B2 (en) Special playback device for video tape recorders
JP3312205B2 (en) Magnetic tape recorder
JP3158350B2 (en) Image recording / playback device
JP3312206B2 (en) Magnetic tape recorder
JPS6033025B2 (en) Video signal reproducing device
JPS58194479A (en) Video recording and reproducing device
JPH07105934B2 (en) Video signal playback device
JPH0194780A (en) Magnetic recording and reproducing device
JPH0793713B2 (en) Video recording / playback device
JP3077480B2 (en) Magnetic recording / reproducing device
JPS6339284A (en) Magnetic recording and reproducing device
JPS6310985A (en) Video signal reproducing device
JPS62286387A (en) Magnetic recording/reproducing method for video signal
JPS63199586A (en) Picture reproducing system
JPS63136895A (en) Video signal reproducing device
JPS6373784A (en) Rotary head type video signal reproducing device
JPH02192376A (en) Method for reproducing still picture
JPS6333080A (en) Picture reproducing device