JPH0377490A - Magnetic recording and reproducing device - Google Patents

Magnetic recording and reproducing device

Info

Publication number
JPH0377490A
JPH0377490A JP1213844A JP21384489A JPH0377490A JP H0377490 A JPH0377490 A JP H0377490A JP 1213844 A JP1213844 A JP 1213844A JP 21384489 A JP21384489 A JP 21384489A JP H0377490 A JPH0377490 A JP H0377490A
Authority
JP
Japan
Prior art keywords
signal
character
video
recorded
video signal
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
JP1213844A
Other languages
Japanese (ja)
Inventor
Masafumi Naka
仲 雅文
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 JP1213844A priority Critical patent/JPH0377490A/en
Publication of JPH0377490A publication Critical patent/JPH0377490A/en
Pending legal-status Critical Current

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  • Television Signal Processing For Recording (AREA)

Abstract

PURPOSE:To record character information newly onto a recorded video by recording a video addition signal of a prescribed frequency to a part of the recorded video signal corresponding to a superimposed character based on a synchronizing signal of a reproduced video signal as a reference at the reproduction mode. CONSTITUTION:A reproduction video signal from a video head 1 passes though a changeover circuit 2 and enters a video signal processing circuit 3 at reproduction mode, is demodulated in the circuit 3, outputted as a composite video signal and inputted to a character signal generating circuit 5. A synchronizing signal of the composite video signal in the circuit 5 is used as a reference position of a character signal to obtain a character signal corresponding part for the recording of the character signal of the video signal, the changeover circuit 2 is switched only at the character signal relevant part and an output signal of an oscillator 4 is fed to a video head 1. Thus, the character part is recorded to a recorded video signal as a luminance signal corresponding to the frequency of the oscillation output and the superimposed character is recorded on the recorded tape.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 この発明は磁気記録再生装置に関し、特にそのスーパー
インポーズ文字を記録する文字記録機構の改良に関する
ものである。
DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic recording/reproducing device, and particularly to an improvement of a character recording mechanism for recording superimposed characters.

〔従来の技術〕[Conventional technology]

第4図は従来の磁気記録再生装置のスーパーインポーズ
文字の記録機構を説明するためのブロックダイヤグラム
であり、ここではVH3方式のVTRの片チャンネルの
みを例にとり説明する0図において1は回転ドラムに取
り付けられたビデオヘッド、5は入力ビデオ信号に文字
等の信号を加える文字信号発生回路、6は該文字信号の
加算された入力ビデオ信号を信号処理するビデオ信号記
録回路である。
FIG. 4 is a block diagram for explaining the superimposed character recording mechanism of a conventional magnetic recording/reproducing device. Here, only one channel of a VH3 system VTR will be explained. 5 is a character signal generating circuit that adds signals such as characters to the input video signal, and 6 is a video signal recording circuit that processes the input video signal to which the character signal has been added.

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

文字信号発生回路5に入力された入力ビデオ信号にある
文字信号を加え記録する場合、例えば第2図のような文
字を記録する場合の信号処理は、第3図のように入力ビ
デオ信号の水平同期信号からその文字の位置に相当する
時間の信号レベルを変化させることにより行うことがで
きる。
When a certain character signal is added to the input video signal input to the character signal generation circuit 5 and recorded, for example when recording characters as shown in FIG. This can be done by changing the signal level at the time corresponding to the position of the character from the synchronization signal.

第3図の波形は第2図の水平掃引部10のビデオ信号の
波形を示しており、ここでは文字は白色である。上記文
字信号発生回路5で文字信号の加算された入力ビデオ信
号は記録回路6により信号処理され、ビデオヘッド1に
より磁気テープ(図示せず)に記録される。
The waveform in FIG. 3 shows the waveform of the video signal of the horizontal sweep section 10 in FIG. 2, and here the characters are white. The input video signal to which a character signal has been added by the character signal generating circuit 5 is subjected to signal processing by a recording circuit 6, and is recorded on a magnetic tape (not shown) by a video head 1.

(発明が解決しようとする課題〕 従来の磁気記録再生装置のスーパーインポーズ機構は以
上のように構成されているので、スーパーインポーズ文
字を記録する場合、予め入力ビデオ信号に文字信号を加
算して記録する必要があり、−度記録したテープに文字
等を追加記録することはできず、またテープに記録した
ビデオ信号に文字信号等を付加する場合は、複数の装置
を用意し、記録済のテープから他のテープにビデオ信号
を複写する際にスーパーインポーズ文字を重ねて記録し
7なければならないといった問題点があった。
(Problem to be Solved by the Invention) Since the superimpose mechanism of the conventional magnetic recording/reproducing device is configured as described above, when recording superimposed characters, the character signal is added to the input video signal in advance. It is not possible to add characters, etc. to a tape that has already been recorded, and if you want to add character signals, etc. to a video signal recorded on a tape, you need to prepare multiple devices and When copying a video signal from one tape to another, there was a problem in that superimposed characters had to be recorded overlapping each other.

この発明は上記のような問題点を解消するためになされ
たもので、記録済のテープにスーパーインポーズ文字を
記録することができる磁気記録再生装置を得ることを目
的とする。
The present invention was made to solve the above-mentioned problems, and an object of the present invention is to provide a magnetic recording and reproducing device that can record superimposed characters on a recorded tape.

〔問題点を解決するための手段〕[Means for solving problems]

この発明に係る磁気記録再生装置は、スーパーインポー
ズ文字を記録する文字記録機構を、所定周波数のビデオ
付加信号を発生するビデオ信号発生回路と、ビデオヘッ
ドを次段の信号処理回路の入力と上記ビデオ信号発生回
路の出力との間で切り換えてこれらに接続する切換回路
と、再生ビデオ信号の同期信号を基準信号として動作し
、上記切換回路を制御する制御手段とから構成し、記録
済ビデオ信号の、上記文字に相当する部分に上記ビデオ
付加信号を記録するようにしたものである。
The magnetic recording and reproducing apparatus according to the present invention includes a character recording mechanism for recording superimposed characters, a video signal generation circuit for generating a video additional signal of a predetermined frequency, and a video head for inputting the next stage signal processing circuit and the above-mentioned video head. It consists of a switching circuit that switches between and connects to the output of the video signal generation circuit, and a control means that operates using the synchronization signal of the reproduced video signal as a reference signal and controls the switching circuit, The video additional signal is recorded in the portion corresponding to the character.

〔作用〕[Effect]

この発明においては、再生モード時、再生ビデオ信号の
同期信号を基準位置として、記録済ビデオ信号の、スー
パーインポーズ文字に相当する部分に、所定周波数のビ
デオ付加信号を記録するようにしたから、その文字部分
がビデオ付加信号の周波数に対応した輝度信号として記
録済のビデオ信号に記録されることとなり、これにより
記録済のテープにスーパーインポーズ文字を記録するこ
とができる。
In this invention, in the playback mode, the video additional signal of a predetermined frequency is recorded in the portion of the recorded video signal corresponding to the superimposed character, using the synchronization signal of the playback video signal as a reference position. The character portion is recorded on the recorded video signal as a luminance signal corresponding to the frequency of the video additional signal, thereby making it possible to record superimposed characters on the recorded tape.

〔実施例〕〔Example〕

以下、この発明の一実施例を図について説明する。 An embodiment of the present invention will be described below with reference to the drawings.

第1図は本発明の一実施例による磁気記録再生装置の構
成を示すブロック図であり、図において、1はビデオヘ
ッド、3は該ビデオヘッド1によりピックアップされた
再生ビデオ信号を信号処理するビデオ信号処理回路、4
は所定周波数の信号を発振する発振回路、2は上記ビデ
オへラド1を上記ビデオ信号処理回路3の入力と、発振
回路4の出力との間で切り換えてこれらに接続する切換
回路、5は上記ビデオ信号処理回路3の出力信号を受け
、その同期信号に基づいて上記切換回路4の切換制御を
行う文字信号発生回路で、この回路5により該同期信号
を基準位置として、上記出力信号の、スーパーインポー
ズ文字に相当する文字信号相当部分が求められ、磁気テ
ープ(図示せず)の該文字信号相当部分に上記発振器4
の出力信号がビデオヘッド1を通じて記録されるように
なっている。
FIG. 1 is a block diagram showing the configuration of a magnetic recording and reproducing apparatus according to an embodiment of the present invention. In the figure, 1 is a video head, and 3 is a video head for processing a reproduced video signal picked up by the video head 1. Signal processing circuit, 4
2 is an oscillation circuit that oscillates a signal of a predetermined frequency; 2 is a switching circuit that switches the video controller 1 between the input of the video signal processing circuit 3 and the output of the oscillation circuit 4 and connects them; 5 is the above-mentioned switching circuit; This is a character signal generation circuit that receives the output signal of the video signal processing circuit 3 and controls the switching of the switching circuit 4 based on the synchronization signal. A portion corresponding to the character signal corresponding to the imposed character is obtained, and the oscillator 4 is applied to the portion corresponding to the character signal on the magnetic tape (not shown).
The output signal is recorded through the video head 1.

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

VH3方式のNTSCフォーマントを例に説明する。第
1図において再生モード時、ビデオヘッド1からの再生
ビデオ信号は切換回路2を通り、ビデオ信号処理回路3
に入り、ここで復調されコンポジットビデオ信号として
出力される。このコンポジットビデオ信号は文字信号発
生回路5へ入力される。この回路5では、ビデオ信号の
同期信号を文字信号の基準位置として、該ビデオ信号の
、文字信号を記録すべき文字信号相当部分を求め、この
文字信号相当部分でのみ上記切換回路2を切り換えて発
振器4の出力信号をビデオヘッド1に供給する。
This will be explained using the NTSC formant of the VH3 system as an example. In FIG. 1, in the playback mode, the playback video signal from the video head 1 passes through the switching circuit 2 and the video signal processing circuit 3.
It is demodulated here and output as a composite video signal. This composite video signal is input to the character signal generation circuit 5. This circuit 5 uses the synchronization signal of the video signal as a reference position for the character signal, determines the portion of the video signal corresponding to the character signal where the character signal is to be recorded, and switches the switching circuit 2 only at this portion corresponding to the character signal. The output signal of the oscillator 4 is supplied to the video head 1.

例えば第2図のような文字を記録しようとする場合、水
平掃引部10での文字信号発生回路5の出力波形は第3
図(b)で示すようになる。一方、テープに記録されて
いる輝度信号はFM変調方式であり、シンクチップが3
.4MHz、ホワイトが4゜4MHzである。ゆえに発
振器4の発振周波数を4.4MHzに設定すれば記録さ
れる文字信号は輝度100%の信号とすることができる
。このようにして記録された信号を再び再生すれば第3
図(a)に示すようなビデオ信号波形が得られる。
For example, when trying to record characters as shown in FIG. 2, the output waveform of the character signal generation circuit 5 in the horizontal sweep section 10
The result is as shown in Figure (b). On the other hand, the luminance signal recorded on the tape is FM modulated, and the sync chip is 3
.. 4MHz, white is 4°4MHz. Therefore, by setting the oscillation frequency of the oscillator 4 to 4.4 MHz, the recorded character signal can be a signal with 100% brightness. If the signal recorded in this way is played back again, the third
A video signal waveform as shown in Figure (a) is obtained.

このように本実施例によれば、一定周波数の信号を発振
する発振器4を設けるとともに、ビデオヘッドlを次段
のビデオ信号処理回路3の入力と発振回路4の出力との
間で切り換えてこれらに接続する切換回路2を設け、再
生ビデオ信号の同期信号を基準信号として動作する文字
信号発生回路5により上記切換回路2を制御して、再生
モード時、記録済ビデオ信号の、スーパーインポーズ文
字に相当する部分に上記発振出力を記録するようにした
ので、その文字部分が該発振出力の周波数に対応した輝
度信号として記録済のビデオ信号に記録されることとな
り、これにより記録済のテープにスーパーインポーズ文
字を記録することができる。
As described above, according to this embodiment, the oscillator 4 that oscillates a signal of a constant frequency is provided, and the video head 1 is switched between the input of the next-stage video signal processing circuit 3 and the output of the oscillation circuit 4. A switching circuit 2 is provided, and the switching circuit 2 is controlled by a character signal generating circuit 5 that operates using the synchronization signal of the reproduced video signal as a reference signal, so that the superimposed characters of the recorded video signal are controlled in the reproduction mode. Since the above oscillation output is recorded in the part corresponding to the oscillation output, the character part is recorded on the recorded video signal as a luminance signal corresponding to the frequency of the oscillation output, and as a result, it is recorded on the recorded tape. Superimposed characters can be recorded.

なお、上記実施例ではVH3方式のNTSCフォーマッ
トを例に説明したが、この方式に限るものではなく、輝
度信号がFM変調されている方式ならば発振器の発振周
波数を変更することにより、同様に適用可能である。ま
たスーパーインポーズ文字が白ベタ文字である場合につ
いて説明したが、文字信号の、文字のフチトリ部に相当
する部分で発振周波数を上記文字信号発生回路5の出力
信号により変化させるようにすれば、スーパーインポー
ズ文字を黒いフチトリ部の文字とすることができる。
Although the above embodiment has been explained using the VH3 NTSC format as an example, it is not limited to this format.If the luminance signal is FM modulated, it can be similarly applied by changing the oscillation frequency of the oscillator. It is possible. Furthermore, although the case where the superimposed characters are solid white characters has been described, if the oscillation frequency of the character signal corresponding to the border of the character is changed by the output signal of the character signal generation circuit 5, Superimposed characters can be characters with black borders.

〔発明の効果〕〔Effect of the invention〕

以上のように、この発明に係る磁気記録再生装置によれ
ば、再生モード時、再生ビデオ信号の同期信号を基準位
置として、記録済ビデオ信号の、スーパーインポーズ文
字に相当する部分に、所定周波数のビデオ付加信号を記
録するようにしたので、記録済の映像に文字情報を新た
に記録することができ、これにより記録済のテープにス
ーパーインポーズ文字を記録することができる効果があ
る。
As described above, according to the magnetic recording and reproducing apparatus according to the present invention, in the reproduction mode, a predetermined frequency is applied to the portion of the recorded video signal corresponding to the superimposed character, using the synchronization signal of the reproduced video signal as a reference position. Since the additional video signal is recorded, character information can be newly recorded on the already recorded video, and this has the effect that superimposed characters can be recorded on the already recorded tape.

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

第1図はこの発明の一実施例による磁気記録再生装置の
構成を示すブロック図、第2図は記録しようとするスー
パーインポーズ文字の一例を示す図、第3図は該文字を
表示した場合の一水平掃引部における輝度信号を説明す
るための図、第4図は従来の磁気記録再生装置の構成を
示すブロック図である。 図において、1はビデオヘッド、2は切換回路、3はビ
デオ信号処理回路、4は発振回路、5は文字信号発生回
路、10は一つの水平掃引部である。 なお図中同一符号は同−又は相当部分を示す。 第2図
FIG. 1 is a block diagram showing the configuration of a magnetic recording and reproducing apparatus according to an embodiment of the present invention, FIG. 2 is a diagram showing an example of superimposed characters to be recorded, and FIG. 3 is a diagram showing the case where the characters are displayed. FIG. 4 is a block diagram showing the configuration of a conventional magnetic recording/reproducing apparatus. In the figure, 1 is a video head, 2 is a switching circuit, 3 is a video signal processing circuit, 4 is an oscillation circuit, 5 is a character signal generation circuit, and 10 is one horizontal sweep section. Note that the same reference numerals in the figures indicate the same or equivalent parts. Figure 2

Claims (1)

【特許請求の範囲】[Claims] (1)スーパーインポーズ文字を記録する文字記録機構
を有する磁気記録再生装置において、上記文字記録機構
は、 所定周波数のビデオ付加信号を発生するビデオ信号発生
回路と、 ビデオヘッドを次段の信号処理回路の入力と、上記ビデ
オ信号発生回路の出力との間で切り換えてこれらに接続
する切換回路と、 再生ビデオ信号の同期信号を基準信号として動作し、上
記切換回路を制御する制御手段とから構成し、 再生モード時、記録済ビデオ信号の、上記文字に相当す
る部分に上記ビデオ付加信号を記録するようにしたもの
であることを特徴とする磁気記録再生装置。
(1) In a magnetic recording and reproducing device that has a character recording mechanism that records superimposed characters, the character recording mechanism includes a video signal generation circuit that generates a video additional signal of a predetermined frequency, and a video head that performs the next stage of signal processing. Consisting of a switching circuit that switches between and connects the input of the circuit and the output of the video signal generation circuit, and a control means that operates using a synchronization signal of the reproduced video signal as a reference signal and controls the switching circuit. A magnetic recording and reproducing device characterized in that, in a reproduction mode, the video additional signal is recorded in a portion of the recorded video signal corresponding to the character.
JP1213844A 1989-08-18 1989-08-18 Magnetic recording and reproducing device Pending JPH0377490A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1213844A JPH0377490A (en) 1989-08-18 1989-08-18 Magnetic recording and reproducing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1213844A JPH0377490A (en) 1989-08-18 1989-08-18 Magnetic recording and reproducing device

Publications (1)

Publication Number Publication Date
JPH0377490A true JPH0377490A (en) 1991-04-03

Family

ID=16645957

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1213844A Pending JPH0377490A (en) 1989-08-18 1989-08-18 Magnetic recording and reproducing device

Country Status (1)

Country Link
JP (1) JPH0377490A (en)

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