JPS59191103A - Video tape recorder - Google Patents

Video tape recorder

Info

Publication number
JPS59191103A
JPS59191103A JP58064691A JP6469183A JPS59191103A JP S59191103 A JPS59191103 A JP S59191103A JP 58064691 A JP58064691 A JP 58064691A JP 6469183 A JP6469183 A JP 6469183A JP S59191103 A JPS59191103 A JP S59191103A
Authority
JP
Japan
Prior art keywords
signal
head
output
switching signal
time
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
JP58064691A
Other languages
Japanese (ja)
Inventor
Yukio Yamashita
幸夫 山下
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.)
Sanyo Electric Co Ltd
Sanyo Denki Co Ltd
Original Assignee
Sanyo Electric Co Ltd
Sanyo Denki Co Ltd
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 Sanyo Electric Co Ltd, Sanyo Denki Co Ltd filed Critical Sanyo Electric Co Ltd
Priority to JP58064691A priority Critical patent/JPS59191103A/en
Publication of JPS59191103A publication Critical patent/JPS59191103A/en
Pending legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B15/00Driving, 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
    • G11B15/02Control of operating function, e.g. switching from recording to reproducing
    • G11B15/12Masking of heads; circuits for Selecting or switching of heads between operative and inoperative functions or between different operative functions or for selection between operative heads; Masking of beams, e.g. of light beams
    • G11B15/14Masking or switching periodically, e.g. of rotating heads

Landscapes

  • Recording Or Reproducing By Magnetic Means (AREA)
  • Television Signal Processing For Recording (AREA)
  • Adjustment Of The Magnetic Head Position Track Following On Tapes (AREA)

Abstract

PURPOSE:To eliminate the break of pictures even when review reproduction is performed with an 8mm. VTR equipped with a DTF by controlling the delay time of a delay means by the output of a phase comparing means. CONSTITUTION:A PG pulse related to a rotary head generated from a PG pulse generating circuit 1 is delayed by a prescribed time by means of a monostable multivibrator 2 and a 30-Hz head aswitch signal is implemented at a head switch signal implementing circuit 3. This head switch signal switches head outputs at the time of reproduction and, at the same time, their rises are phase-compared with a repoductive vertical synchronizing signal at a phase comparing circuit 4. Then, this comparison signal is changed to a control signal which controls the time constant of the monostable multi-vibrator 2 at a control signal implementing circuit 5.

Description

【発明の詳細な説明】 (イ)産業上の利用分野 本発明は8ミ1JVTRに用いて好適なビデオテープレ
コーダに関する。
DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a video tape recorder suitable for use in an 8mm 1JVTR.

(ロ)従来技術 近年、VTRの小型化が進み、8ミリVTRと称される
超小型VTRの規格が提案されている。
(B) Prior Art In recent years, VTRs have become more compact, and a standard for ultra-compact VTRs called 8 mm VTRs has been proposed.

この8ミリVTRでは、テープは221°巻付けられビ
デオトラックの他にPCMオーディオトラ・ツクをも回
転ヘッドにより記録しており、その記録トラ・ツクフォ
ーマットを第1図(イ)Iこ示す。
In this 8 mm VTR, the tape is wound 221 degrees and in addition to the video track, a PCM audio track is also recorded by a rotating head, and the recording track format is shown in FIG. 1(A).

図中、左方すなわちテープの下端側からPCM用のクロ
・ツクエリヤ(CI)5°、PCMデータエリヤ(P)
 26.32°、クロックエリヤ(C2)2.06°、
ビデオ信号が重複記録されるマージンエリヤ(Ml)2
.62°、ビデオエリヤ(V) 180°、マージンエ
リヤ(M2 ) 5°の順番で構成され、全部で221
°となっている。
In the figure, from the left side, that is, from the bottom edge of the tape, PCM black area (CI) 5 degrees, PCM data area (P)
26.32°, clock area (C2) 2.06°,
Margin area (Ml) 2 where video signals are recorded repeatedly
.. 62°, video area (V) 180°, margin area (M2) 5°, total 221
°.

上述のビデオエリヤ(Vlにビデオ信号を記録する際は
第1図(ロ)に示す記録用へ・リド切換信号によりゲー
トし、マージンエリヤ(Ml)(M2)にもビデオ信号
を記録する。
When recording a video signal in the above-mentioned video area (Vl), it is gated by the recording/read switching signal shown in FIG. 1(b), and the video signal is also recorded in the margin areas (Ml) (M2).

そして、再生時には第1図(/1)に示す再生用へ・リ
ド切換信号によりビデオエリヤ(V)のみをゲートして
再生す・る。
At the time of reproduction, only the video area (V) is gated and reproduced by the reproduction/read switching signal shown in FIG. 1(/1).

ここで前記再生ヘッド切換信号は、へ・リドの回転を検
出するPGコイルより発生したPGパルスをモノマルチ
により所定時間遅延し、例えばフリ・ツブフロ・リブ等
により30Hzlこ分周されて作成される。
Here, the playback head switching signal is created by delaying the PG pulse generated by the PG coil that detects the rotation of the head/lid by a predetermined time using a monomulti, and then dividing the frequency by 30 Hz by using, for example, a fly, a tube, a rib, etc. .

そして、このモノマルチの時定数は温度ドリフト或いは
調整ずれによりばらつくことがあるため、第1図に)に
示す如く、へ・リド切換信号はビデオエリヤtVlから
ずれてしまう場合がある。
Since the time constant of this mono-multiple may vary due to temperature drift or adjustment error, the he/lid switching signal may deviate from the video area tVl, as shown in FIG. 1).

しかしながら、ビデオエリヤの前後には、マージンエリ
ヤ(Ml)(M2)か設けられているため、通常、この
範囲内でのずれは再生画面に影響は14い。
However, since margin areas (M1) and (M2) are provided before and after the video area, a deviation within this range usually has no effect on the playback screen.

一方、8ミリVTRの規格では、DTP(ダイナミック
トラヅクフオロアー)と呼ばれるトラ・リキング方式が
採用されている。このDTPとは回転ヘッドを圧電素子
上に配置し、特殊再生時に前記圧電素子をトラ・リフに
直交する方向に変位させてトラッキングを行なうもので
あり、再生画面上のノイズやブレを解消するものである
On the other hand, the 8mm VTR standard employs a tracking method called DTP (dynamic tracking). This DTP is a system in which a rotating head is placed on a piezoelectric element, and tracking is performed by displacing the piezoelectric element in a direction perpendicular to the track rift during special playback, which eliminates noise and blur on the playback screen. It is.

第2図によりレビュー再生(逆方向高速再生)における
へ・リド軌跡を説明する。通常のレビュー再生時におけ
るへ・リド軌跡は記録トラ・リフト)に対して点線の如
く傾斜し、始端(Alから終端間まで走査する。
Referring to FIG. 2, the forward and backward trajectories in review playback (reverse high-speed playback) will be explained. The read/write trajectory during normal review playback is inclined as shown by the dotted line with respect to the recording track/lift, and scans from the start end (Al to the end).

そして、このレビュー再生をDTPで行った場合、ヘッ
ド軌跡は一点鎖線で示す如く、始端及び終端はA +A
 、 B +Hに変位する。よって、第6図に示す如く
レビュー再生時における再生へ・リド切換信号ヒ\)は
、通常再生時に比べて、記録トラ・リフ(イ)のゲート
範囲が実質的に広くなる。
When this review playback is performed using DTP, the head trajectory is as shown by the dashed line, and the starting and ending points are A + A.
, B +H. Therefore, as shown in FIG. 6, the gate range of the recording track riff (a) of the playback/read switching signal H\) during review playback is substantially wider than that during normal playback.

この1こめ、前述の如くモノマルチの時定数−こ変動が
生ずると第3図に))に示す様に、再生へ・リド切換信
号のゲート範囲が記録へ・リド切換信号のゲート範囲を
越えてしまう。すなわちレビュー再生時、マージンエリ
ヤ(Ml)を越えてクロ・リフエリヤ(C2)をも再生
してしまうため、再生画面上で画像の途切れが発生する
At this point, as mentioned above, if the time constant of the mono multi-channel multiplayer fluctuates, as shown in Figure 3), the gate range of the play/read switch signal exceeds the gate range of the record/read switch signal. I end up. That is, at the time of review reproduction, the black reef area (C2) is also reproduced beyond the margin area (Ml), resulting in interruptions in the image on the reproduction screen.

ヒ1)発明の目的 本発明はDTPを備えた8ミリVTRにおいて、レビュ
ー再生を行っても画像の途切れることがないビデオテー
プレコーダを提供するものである。
H1) Purpose of the Invention The present invention provides a video tape recorder in which images are not interrupted even during review playback in an 8 mm VTR equipped with DTP.

(ニ)発明の構成 本発明は回転ヘッドの回転を検出する手段と、該回転検
出手段出力によりへ・リド切換信号を作成する手段と、
前記回転検出手段出力若しくは前記へ・リド切換信号作
成手段出力を所定時間遅延する手段とを備えたビデオテ
ープレコーダにおいて、前記ヘッド切換信号作成手段出
力若しくは前記遅延手段出力と基準信号とを位相比較す
る手段を設け、該位相比較手段出力によりnIJ記遅延
手段の遅延時間を制御することを特徴とするビデオテー
プレコーダである。
(D) Structure of the Invention The present invention comprises means for detecting the rotation of a rotary head, means for creating a heli/lid switching signal based on the output of the rotation detecting means,
In a video tape recorder comprising means for delaying the output of the rotation detecting means or the output of the head/lid switching signal generating means for a predetermined period of time, the phase of the output of the head switching signal generating means or the output of the delaying means is compared with a reference signal. The video tape recorder is characterized in that the video tape recorder is provided with means for controlling the delay time of the nIJ delay means by the output of the phase comparison means.

(ホ)実施例 以下、図面lこ従い本発明の一実施例を説明するっ第4
図は本実施例のへ・リド切換信号作成回路の概略プロ・
リフ図であり、PGパルス発生回路(1)より発生する
回転へ・リドに関連したPCパルスはモノマルチ(2)
により所定時間遅延され、ヘッド切換信号作成回路(3
)【こて3 [IHzのへ・リド切換信号が作成される
(E) Example Hereinafter, an example of the present invention will be explained with reference to the drawings.
The figure is a schematic diagram of the HE/RID switching signal generation circuit of this embodiment.
This is a riff diagram, and the PC pulse related to the rotation generated by the PG pulse generation circuit (1) and the lid is monomulti (2)
The head switching signal generation circuit (3) is delayed for a predetermined time by
) [IHz to/from switching signal is created.

このへ・リド切換信号は再生時のへ・リド出力を切換え
ると共に、その立上りが位相比較回路(4)にて再生垂
直同期信号と位相比較される。そして、この比較信号は
制御信号作成回路(5)で制御信号とされて前記モノマ
ルチの時定数を制御する。
This head/lid switching signal switches the head/lid output during reproduction, and its rising edge is phase-compared with the reproduced vertical synchronizing signal in a phase comparison circuit (4). This comparison signal is then used as a control signal in a control signal generation circuit (5) to control the time constant of the monomulti.

すなわち、第3図イ・)に示す如く、垂直同期信号(V
sγ)はビデオ信号の記録始端、すなわちマージンエリ
ヤ(Ml)の左端から所定期間(6H)離れた位置に記
録されており、再生へ・リド切換信号の立上りの位相が
再生垂直同期信号と一定の関係になる様に制御される。
That is, as shown in Fig. 3A), the vertical synchronization signal (V
sγ) is recorded at a position a predetermined period (6H) away from the recording start end of the video signal, that is, the left end of the margin area (Ml), and the rising phase of the playback/read switching signal is constant with the playback vertical synchronization signal. It is controlled so that it becomes a relationship.

よって、第6図併)の如く再生へ・リド切換信号が変動
しても同図0刃の如く制御されるため、ゲート範囲がク
ロックエリヤ(C2月こ及ぶことはない。
Therefore, even if the regeneration/read switching signal fluctuates as shown in Figure 6), the gate range will not extend beyond the clock area (C2) because it is controlled as in the 0 blade in the same figure.

尚、上述の実施例では、ヘッド切換信号と垂直同期信号
とを位相比較する様構成したが、モノマルチ出力と垂直
同期信号を位相比較するように構成しても良い。
In the above-described embodiment, the head switching signal and the vertical synchronization signal are phase-compared, but the mono-multi output and the vertical synchronization signal may be phase-compared.

また、PGパルスより先に30)IZの信号を作成し、
これをモノマルチで遅延する様に構成してし良い。
Also, create the 30) IZ signal before the PG pulse,
You can configure this so that it is delayed by monomultiple.

(へ)発明の効果 上述の如く本発明に依れば、へ・リド切換信号の位相を
決定するモノマルチの時定数に変動が生じてもヘッド切
換信号の位相は再生垂直同期信号により制御されるため
位相が大きく変動することがなく、8ミリVTRにおい
てもD 爪F lこよりレビ□−再生した場合でも再生
画面上で画像が途切れることがない。
(F) Effects of the Invention As described above, according to the present invention, the phase of the head switching signal is controlled by the reproduced vertical synchronization signal even if the time constant of the monomulti that determines the phase of the head/lid switching signal fluctuates. Therefore, the phase does not fluctuate greatly, and even when playing back from the D claw Fl on an 8 mm VTR, the image will not be interrupted on the playback screen.

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

第1図は8ミリVTRの記録トラックフォーマット及び
ヘッド切換信号の説明図、第2図はレビュー再生時のト
ラックパターン図、第3図はレビュー再生時のへ・リド
切換信号の説明図、第4図は本発明の一実施例番こおけ
るヘッド切換信号作成回路のプロ・リフ図である。 主な図番の説明 (11・PGパルス発生回路、(2)・・・モノマルチ
、(3トヘッド切換信号作成回路、(4)・・・位相比
較回路、(5)・・制御信号発生回路。
Fig. 1 is an explanatory diagram of the recording track format and head switching signal of an 8mm VTR, Fig. 2 is a track pattern diagram during review playback, Fig. 3 is an explanatory diagram of the HE/RID switching signal during review playback, and Fig. 4 is an explanatory diagram of the head switching signal during review playback. The figure is a professional diagram of a head switching signal generating circuit according to an embodiment of the present invention. Explanation of main drawing numbers (11. PG pulse generation circuit, (2)...Mono multi, (3) Head switching signal generation circuit, (4)...Phase comparison circuit, (5)...Control signal generation circuit .

Claims (1)

【特許請求の範囲】[Claims] (1)回転へ・リドの回転を検出する手段と、該回転検
出手段出力多こよりへ・リド切換信号を作成する手段と
、前記回転検出手段出力若しくは前記へ・リド切換信号
作成手段出力を所定時間遅延する手段とを備えたビデオ
テープレコーダにおいて、前記へ・ソド切換信号作成手
段出力若しくは前記遅延手段出力と基準信号とを位相比
較する手段を設け、該位相比較手段出力により前記遅延
手段の遅延時間を制御することを特徴とするビデオテー
プレコーダ。 (2+  ntJ記基準基準信号像信号中の垂直同期信
号である特許請求の範囲第1項記載のビデオテープレコ
ーダ。
(1) A means for detecting the rotation of the rotation/lid, a means for creating a to/from switching signal from the output of the rotation detection means, and a predetermined output of the rotation detecting means or the output from the to/from/lid switching signal creation means. In the video tape recorder, the video tape recorder is provided with a means for phase comparing the output of the forward/backward switching signal generation means or the output of the delay means with a reference signal, and the output of the phase comparison means delays the delay of the delay means. A videotape recorder characterized by time control. (2+ ntJ) The video tape recorder according to claim 1, wherein the reference signal is a vertical synchronizing signal in an image signal.
JP58064691A 1983-04-12 1983-04-12 Video tape recorder Pending JPS59191103A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP58064691A JPS59191103A (en) 1983-04-12 1983-04-12 Video tape recorder

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP58064691A JPS59191103A (en) 1983-04-12 1983-04-12 Video tape recorder

Publications (1)

Publication Number Publication Date
JPS59191103A true JPS59191103A (en) 1984-10-30

Family

ID=13265421

Family Applications (1)

Application Number Title Priority Date Filing Date
JP58064691A Pending JPS59191103A (en) 1983-04-12 1983-04-12 Video tape recorder

Country Status (1)

Country Link
JP (1) JPS59191103A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6469172A (en) * 1987-09-10 1989-03-15 Mitsubishi Electric Corp Video signal recording and reproducing device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6469172A (en) * 1987-09-10 1989-03-15 Mitsubishi Electric Corp Video signal recording and reproducing device

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