JPH0614732B2 - Superimpose circuit - Google Patents
Superimpose circuitInfo
- Publication number
- JPH0614732B2 JPH0614732B2 JP63142428A JP14242888A JPH0614732B2 JP H0614732 B2 JPH0614732 B2 JP H0614732B2 JP 63142428 A JP63142428 A JP 63142428A JP 14242888 A JP14242888 A JP 14242888A JP H0614732 B2 JPH0614732 B2 JP H0614732B2
- Authority
- JP
- Japan
- Prior art keywords
- signal
- reproduction
- pattern
- video
- 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 - Fee Related
Links
Landscapes
- Studio Circuits (AREA)
- Television Signal Processing For Recording (AREA)
Description
【発明の詳細な説明】 (イ)産業上の利用分野 本発明はビデオテープレコーダのスーパーインポーズ回
路に関する。The present invention relates to a superimposing circuit of a video tape recorder.
(ロ)従来の技術 映像にパターンを多重して表示するスーパーインポーズ
回路に付いては、特開昭62−140565号公報(H
04N5/278)や特開昭62−203489号公報
(H04N5/278)等に開示されている。これらス
ーパーインポーズ方法としては、基準同期信号に対して
映像信号源とパターン信号源を同期せしめて両信号を合
成する方法と、映像信号源より得られる同期信号にパタ
ーン信号源を同期せしめ両信号を合成する方法とが一搬
に採用されている。(B) Prior art A superimposing circuit for displaying a pattern by multiplexing it on an image is disclosed in JP-A-62-140565 (H).
04N5 / 278) and JP-A-62-203489 (H04N5 / 278). These superimposing methods include a method of synchronizing the video signal source and the pattern signal source with respect to the reference synchronization signal and combining both signals, and a method of synchronizing the pattern signal source with the synchronization signal obtained from the video signal source. The method of synthesizing
(ハ)本発明が解決しようとする課題 しかし一搬のビデオテープレコーダの再生映像信号にス
ーパーインポーズを為す場合、ビデオテープレコーダを
外部同期駆動するための回路を設けておらず、而もビデ
オテープレコーダ内の再生用の基準信号はサーボ用のI
C内で形成されるものの外部端子に導出されない構成と
なっていることが多い。従って基準信号によりパターン
信号源を駆動することが出来ない。(C) Problems to be Solved by the Present Invention However, in the case of superimposing a reproduced video signal of a portable video tape recorder, a circuit for externally driving the video tape recorder is not provided. The reference signal for reproduction in the tape recorder is I for servo.
In many cases, the structure is formed in C but is not led to the external terminal. Therefore, the pattern signal source cannot be driven by the reference signal.
そこでビデオテープレコーダの再生映像信号に同期せし
めてパターン信号源を駆動することが考えられるが、フ
ィールドスチル再生を為すビデオテープレコーダの様に
アジマスを共通にする主ヘッドと副ヘッドにより同一記
録トラックを再生走査する場合、副ヘッドは主ヘッドに
対して頂度180度対向する位置にはなく、例えばサブ
ヘッドが180°対向する位置より25H分だけ先行す
る位置にあるとき、スチル再生映像信号中の再生垂直同
期信号の周期は5H分のアンバランスを来す。この様に
垂直同期周期の異なるスチル再生映像信号をモニタ画面
上でモニタすると再生画面が縦揺れを来す。そこで、こ
のモニタ画面の縦揺れを防止するために垂直同期信号の
タイミングを変更する目的で同期再挿入処理を為してい
る。尚、この同期再挿入時のタイミングはモニタTVの
特性に応じて変更する必要がある。Therefore, it is conceivable to drive the pattern signal source in synchronization with the reproduced video signal of the video tape recorder. However, like the video tape recorder for field still reproduction, the same recording track is formed by the main head and sub head that share the same azimuth. When performing reproduction scanning, when the sub head is not at a position where the sub head faces 180 degrees from the main head but is at a position that precedes the position where the sub head faces 180 degrees by 25H, the reproduction in the still reproduction video signal is performed. The cycle of the vertical synchronizing signal has an imbalance of 5H. When still reproduced video signals having different vertical synchronization periods are monitored on the monitor screen as described above, the reproduced screen vertically shakes. Therefore, the sync re-insertion process is performed for the purpose of changing the timing of the vertical sync signal in order to prevent the vertical shaking of the monitor screen. The timing of this synchronous reinsertion must be changed according to the characteristics of the monitor TV.
上述する様に同期再挿入処理した映像信号は、各フィー
ルドに於て、垂直同期信号タイミングと映像情報とが共
通の位相関係にはなく、再挿入した垂直同期信号を基準
にパターン信号源を駆動すれば、再生画面中でパターン
信号に上下の揺れを来す。As described above, in the video signal subjected to the synchronous re-insertion processing, the vertical sync signal timing and the video information do not have a common phase relationship in each field, and the pattern signal source is driven based on the re-inserted vertical sync signal. If so, the pattern signal will fluctuate up and down in the playback screen.
(ニ)課題を解決するための手段 よって、本発明によれば、特殊再生時に同期再挿入処理
を施すビデオテープレコードに於いて、再生同期信号又
はそれと同位相の同期パルスに同期するパターン信号源
を配することを特徴とする。(D) According to the present invention, according to the present invention, a pattern signal source that is synchronized with a reproduction synchronization signal or a synchronization pulse having the same phase as that of a reproduction synchronization signal in a video tape record that is subjected to synchronous reinsertion processing during special reproduction. It is characterized by arranging.
(ホ)作用 よって、本発明によれば再生映像情報とパターン情報と
の合成位相が一致する。(E) Operation Therefore, according to the present invention, the combined phase of the reproduced video information and the pattern information matches.
(ヘ)実施例 以下、本発明を図示せる実施例に従い説明する。本実施
例は、記録トラックを走査方向に1H(Hは水平同期周
期)づつずらせ乍らアジマス記録を為す8ミリビデオに
本発明を採用するものである。更に本実施例の8ミリビ
デオは、アジマスを異にする一対の主ヘッドを180°
対向して配すると共に、一方の主ヘッドと同一アジマス
の副ヘッドを他方の主ヘッドに対し2.5H分先行して
配し一方の主ヘッドと副ヘッドとが交互に走査すること
により得られる再生FM映像信号を映像処理回路(1)に
入力せしめている。(F) Example Hereinafter, the present invention will be described in accordance with an illustrated example. In the present embodiment, the present invention is applied to an 8 mm video in which azimuth recording is performed by shifting recording tracks by 1H (H is a horizontal synchronization period) in the scanning direction. Further, in the 8 mm video of the present embodiment, a pair of main heads having different azimuths is 180 °.
It is obtained by arranging the main head and the sub head having the same azimuth as one main head in advance of the other main head by 2.5H, and alternately scanning the main head and the sub head. The reproduced FM video signal is input to the video processing circuit (1).
その結果スチル再生モードで得られる再生映像信号は、
1フレームが527(=525+2)Hで構成され、主
ヘッド出力側のフィールドが266H、副ヘッド側のフ
ィールドが261Hとなる。更に、再生映像信号中の再
生垂直同期信号はヘッド出力切換パルス(RF)に対し
主ヘッド側が11H、副ヘッド側が8.5H遅れる(第
2図参照)。As a result, the playback video signal obtained in the still playback mode is
One frame is composed of 527 (= 525 + 2) H, the main head output side field is 266H, and the sub head side field is 261H. Further, the reproduction vertical synchronizing signal in the reproduction video signal is delayed by 11H on the main head side and 8.5H on the sub head side with respect to the head output switching pulse (RF) (see FIG. 2).
この様にフィールド間に5Hもの差があるとモニタ画面
が縦揺れを来す。この縦揺れを防止するため、同期再挿
入回路(8)では、同期再挿入処理を行っている。この同
期再挿入は、再生垂直同期信号タイミングに先行して新
たな垂直同期信号を挿入するものである。この新たな垂
直同期信号(VD1)は、マイクロコンピュータ(7)よ
り導出されマイクロコンピュータ(7)は同期調整信号に
従って主ヘッド側の垂直同期信号の形成タイミングを変
化せしめている。尚、マイクロコンピュータ(7)はビデ
オヘッドを配するドラムの回転速度信号と回転位相信号
とをタイミング入力としてモード指定信号と同期調整信
号に従って新たな垂直同期信号を形成している。If there is a difference of 5H between the fields, the monitor screen will pitch vertically. In order to prevent this pitching, the sync reinsertion circuit (8) performs a sync reinsertion process. In this sync re-insertion, a new vertical sync signal is inserted prior to the reproduction vertical sync signal timing. This new vertical synchronizing signal (VD1) is derived from the microcomputer (7), and the microcomputer (7) changes the formation timing of the vertical synchronizing signal on the main head side in accordance with the synchronizing adjustment signal. The microcomputer (7) forms a new vertical synchronization signal according to the mode designation signal and the synchronization adjustment signal, using the rotation speed signal and the rotation phase signal of the drum on which the video head is arranged as timing inputs.
本実施例では同期再挿入回路(8)の前段で再生映像信号
に対してパターン信号を合成している。この合成回路
(6)は、マイクロコンピュータ(7)により動作を制御さ
れ、パターン信号源(5)が発するパターン信号をスイッ
チングによって多重している。また、パターン信号源
(5)は、再生映像信号中の再生垂直同期信号を起点に再
生水平同期信号に同期してパターン信号を形成導出せし
めている。そこで、本実施例では、再生映像信号を水平
同期分離回路(2)に入力して得られる水平同期信号をP
LL回路(3)に入力して得られる連続水平同期信号をパ
ターン信号源(5)の計数入力としている。更に水平同期
信号を入力する垂直同期信号形成回路(4)は同期分離に
より得られる再生垂直同期信号(VD)をパターン信号
源(5)の基準入力としている。In this embodiment, the pattern signal is combined with the reproduced video signal in the preceding stage of the synchronous reinsertion circuit (8). This synthesis circuit
The operation of (6) is controlled by the microcomputer (7), and the pattern signals generated by the pattern signal source (5) are multiplexed by switching. Also, the pattern signal source
In (5), the pattern signal is formed and derived in synchronization with the reproduction horizontal synchronization signal from the reproduction vertical synchronization signal in the reproduction video signal as a starting point. Therefore, in this embodiment, the horizontal sync signal obtained by inputting the reproduced video signal to the horizontal sync separation circuit (2) is P
The continuous horizontal synchronizing signal obtained by inputting to the LL circuit (3) is used as the count input of the pattern signal source (5). Further, the vertical synchronizing signal forming circuit (4) for inputting the horizontal synchronizing signal uses the reproduced vertical synchronizing signal (VD) obtained by the sync separation as the reference input of the pattern signal source (5).
従って、パターン信号は、再生された同期信号に位相同
期して形成されることになり、再生映像情報とパターン
情報の位相は一致することになる。Therefore, the pattern signal is formed in phase synchronization with the reproduced synchronization signal, and the phases of the reproduced video information and the pattern information match.
上述する実施例では、同期分離により得られる再生垂直
同期信号を直接パターン信号源に入力しているが、再生
垂直同期信号にノイズが発生する場合には、マイクロコ
ンピュータ(7)にて再生垂直同期信号タイミングに一致
する同期パルスを形成し、この同期パルスを同期分離し
て得られる再生垂直同期信号に代えてパターン信号源に
入力しても良く、斯る構成が本発明に含まれることは言
う迄もない。In the above-described embodiment, the reproduction vertical synchronization signal obtained by the sync separation is directly input to the pattern signal source.However, when noise occurs in the reproduction vertical synchronization signal, the reproduction vertical synchronization signal is reproduced by the microcomputer (7). It is also possible to form a sync pulse that coincides with the signal timing and input the sync pulse to the pattern signal source instead of the reproduced vertical sync signal obtained by synchronously separating the sync pulse. It is said that such a configuration is included in the present invention. Not even.
また、本実施例では通常再生時にマイクロコンピュータ
(7)より新たな同期信号が導出されず、また倍速再生時
にスチル再生時とは別のタイミングで新たな同期信号が
形成されるものとする。Further, in this embodiment, a microcomputer is used during normal reproduction.
It is assumed that a new sync signal is not derived from (7), and that a new sync signal is formed at the timing different from that at the time of still reproduction during double speed reproduction.
更に、パターン信号は、マイクロコンピュータ(7)に入
力されるON/OFF信号により導出をコントロールさ
れる。Further, the derivation of the pattern signal is controlled by an ON / OFF signal input to the microcomputer (7).
また更に、本実施例では間歇スロー再生時にも安定なパ
ターン情報をモータ画面に映出せしめることが出来る。Furthermore, in the present embodiment, stable pattern information can be displayed on the motor screen even during intermittent slow playback.
(ト)発明の効果 よって、本発明によれば、スチル再生時やスロー再生時
に垂直同期信号を再挿入するにも拘らずパターン情報に
縦揺れを来すことがなく、モニタ画面に安定なパターン
を形成することが出来その効果は大である。(G) According to the present invention, according to the present invention, a stable pattern can be displayed on the monitor screen without causing vertical pitching in the pattern information despite re-insertion of the vertical synchronization signal during still reproduction or slow reproduction. Can be formed and its effect is great.
【図面の簡単な説明】 図は本発明の一実施例を示し、第1図は回路ブロック
図、第2図は要部信号波形図を、それぞれ示す。 (5)……パターン信号源、(6)……合成回路。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows an embodiment of the present invention, FIG. 1 is a circuit block diagram, and FIG. 2 is a signal waveform diagram of essential parts. (5) …… Pattern signal source, (6) …… Synthesis circuit.
Claims (1)
る一対の主ヘッドと、一方の主ヘッドとアジマスを共通
にして他方の主ヘッドに近接配置される副ヘッドとを配
し、静止画再生時に一方の主ヘッドと副ヘッドにより同
一記録トラックを連続走査して得られる再生映像信号に
同期再挿入処理を施すことによりモニタ画面の縦揺れを
防止するビデオテープレコーダに於て、 再生垂直同期信号又は再生垂直同期信号と同位相の同期
パルスに同期してパターン信号を発生するパターン信号
源と、 前記パターン信号を再生映像信号に合成する合成回路と
を、 それぞれ配して成るスーパーインポーズ回路。1. A still image is provided which comprises a pair of main heads which are arranged opposite to each other by 180 ° with different azimuths, and a sub head which is arranged in proximity to the other main head with one main head in common. In the video tape recorder, which prevents vertical pitching of the monitor screen by performing re-insertion processing on the playback video signal obtained by continuously scanning the same recording track by one of the main head and sub head during playback, playback vertical synchronization A superimposing circuit comprising a pattern signal source for generating a pattern signal in synchronization with a sync pulse having the same phase as a signal or a reproduction vertical synchronizing signal, and a synthesizing circuit for synthesizing the pattern signal with a reproduced video signal. .
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP63142428A JPH0614732B2 (en) | 1988-06-09 | 1988-06-09 | Superimpose circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP63142428A JPH0614732B2 (en) | 1988-06-09 | 1988-06-09 | Superimpose circuit |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH01311683A JPH01311683A (en) | 1989-12-15 |
JPH0614732B2 true JPH0614732B2 (en) | 1994-02-23 |
Family
ID=15315091
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP63142428A Expired - Fee Related JPH0614732B2 (en) | 1988-06-09 | 1988-06-09 | Superimpose circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0614732B2 (en) |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0614731B2 (en) * | 1987-03-13 | 1994-02-23 | 三菱電機株式会社 | Magnetic recording / reproducing device |
-
1988
- 1988-06-09 JP JP63142428A patent/JPH0614732B2/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
JPH01311683A (en) | 1989-12-15 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
LAPS | Cancellation because of no payment of annual fees |