JPS5864884A - Video recording and reproducing device - Google Patents

Abstract

PURPOSE:To simplify the circuit and to make discrimination easy, by establishing the relation between the control pulse frequency and video signal even at recording, in a device automatically recording and reproducing video signals with different frequency for vertical synchronizing signals. CONSTITUTION:An NTSC signal (60Hz) having higher frequency of vertical signals from a vertical synchronizing signal detection circuit 2 is frequency- divided into 30Hz at a monostable multivibrator 3. A PAL signal having lower frequency (50Hz) is set to be not frequency-divided. Thus, the PAL signal is outputted as 50Hz and inputted to a switch circuit 5. Further, a control pulse is inputted to the same switch circuit 5, and a pulse of vertical synchronizing signal is outputted at recording and a control pulse is outputted at reproduction by switching. An output of a frequency discriminating circuit 6 is fed back from a switch circuit 7 at reproduction and not fed back at recording, and the relation between the frequency and video signal discriminated at the circuit 6 is the same for recording and reproduction.

Description

【発明の詳細な説明】 本発明はｐｒｒｓｃ信号とＰＡＬＭ号のような―直Ｐ４
期信号周波数ＯＡなる映像信号を自励的に紀１ｉ１４生
できる映像紀鍮再生装置における判別方法に＠するもの
である。DETAILED DESCRIPTION OF THE INVENTION The present invention utilizes direct P4 signals such as the prrsc signal and the PALM signal.
This is a determination method in a video playback device that can self-excitedly generate a video signal with an initial signal frequency OA.

従来Ｖ　Ｔ　Ｒ等ＩＫオイ”ＣＮＴＳＣ信号トＰ　Ａ　
１４７１号がミーされている一磁気テープを再生する場
會記録されている映像信号の種類を検出する方法として
、磁気テープに記録されているコントロールパルスを検
出じていた。例えば表ＩＫ示すような周１ｊＬ数の関係
がある場合、落１図に示すヒスプリシス特性を有する肩
ｔＩＬａ！ｆ４Ｊ別回路にて判別してい九〇 表１ 一方、ｋｉｉ＆ＷｔＫ、　Ｎ１”ＳＣ（ＩｎトＰ　Ａ　
Ｌ　信４ｔ−判別する場合ｘｒｓｃ僅号の信号ｌｌ１Ｉ
期信号の周波数は６ＪχでＰＡＬ信号の垂直同期信号の
周波数は５０１１ｚである。王妃！直同期値号の周波数
を分周し九場合それぞれ％　５０Ｈｚと２５１ｋになる
。８１図のヒスプリシス特性を解除し几４２図のような
判別回路にて判別する場合、　２５１１ｚをＮＴＳＣ信
号と判別しＨＱＨｚでＰ　Ｊ　ｒ　ｉａ号と判別する。Conventional VTR etc. IK Oi” CNTSC signal PA
No. 1471 was used to detect control pulses recorded on the magnetic tape as a method for detecting the type of video signal recorded when playing back the magnetic tape. For example, when there is a relationship between the number of circumferences 1jL as shown in Table IK, the shoulder tILa! has the hysteresis characteristic shown in Table IK! 90 Table 1 On the other hand, kii&WtK, N1”SC (IntP A
L signal 4t-When determining xrsc small signal ll1I
The frequency of the synchronizing signal is 6Jχ, and the frequency of the vertical synchronizing signal of the PAL signal is 5011z. Queen! The frequency of the direct synchronization signal is divided into 9%, which results in 50Hz and 251k, respectively. When the hysteresis characteristic shown in Figure 81 is canceled and a discrimination circuit such as that shown in Figure 42 is used for discrimination, 2511z is determined to be an NTSC signal, and HQHz is determined to be a P.J.R.I.A. signal.

従りて＆！鑞時と再生時で映像信号のｆ１別が異なり。Therefore &! The f1 classification of the video signal is different between the time of production and the time of playback.

判別回路が複雑となる。The discrimination circuit becomes complicated.

本発明の目的は上記記録時と、再生時において！ｆ４Ｊ
別信号が逆になり判別回路が複雑になる欠点をなくし、
かつ判別を容易にする回路を提供することにある。The purpose of the present invention is to perform the above-mentioned recording and reproduction! f4J
Eliminates the drawback that different signals are reversed and the discrimination circuit becomes complicated,
Another object of the present invention is to provide a circuit that facilitates discrimination.

不発−は記録時における垂直同期信号の分周を単安定マ
ルチパイグレー−により行なう。さらに単安定マルチバ
イブレータの時定数を選ぶことにより記録時においても
再生時のコントａ−ルパルスの周波数と映像信号の関係
が成立するようにして、記録、再生兼用の周波数判別１
路にて判別させることを特徴とする。In case of misfiring, frequency division of the vertical synchronizing signal during recording is performed using a monostable multi-pixel signal. Furthermore, by selecting the time constant of the monostable multivibrator, the relationship between the frequency of the control pulse and the video signal during playback is established even during recording, and frequency discrimination for both recording and playback is performed.
It is characterized by being distinguished on the road.

以下１本ｍ明の一実施例を薦５図により説明する。１直
同期信号検出回路２からの垂直同期信号が単安定マルチ
バイブレータ５に入力され単安定マルチパイプレーク５
の出力は微分回路４に印加される。微分回路４の出力と
、コントａ−ルパルス検出ｍＭ１からのコン）ａ−ルバ
ルスがスイッチ回路５に供給されている。スイッチ回路
５によって選択された出力は周波数判別回路６に供給さ
れている６周波数判別回路４の出力はスイッチ１ｇ１＠
　７　？：介して周波数判別回路６に帰還されている。Hereinafter, one embodiment of the present invention will be explained with reference to five figures. 1 The vertical synchronization signal from the series synchronization signal detection circuit 2 is input to the monostable multivibrator 5 and the monostable multipipe rake 5
The output of is applied to the differentiating circuit 4. The output of the differentiating circuit 4 and the control pulse from the control pulse detection mM1 are supplied to the switch circuit 5. The output selected by the switch circuit 5 is supplied to the frequency discrimination circuit 6.The output of the frequency discrimination circuit 4 is supplied to the switch 1g1@
7? : is fed back to the frequency discrimination circuit 6 via.

垂直同期信号のうち周波数の高いＮＴＳＣ信号（６０Ｈ
ｚ　）は単安定マルチバイブレータ３にて分周されｓ　
ｏＨｚになる。ま次単安定マルチバイブレータ３の時定
数は垂直同期信号のうち周波数の低いＰＡＬ信号（５０
Ｈｚ　）は分周しないように設定しである。従ってＰＡ
Ｌ信号（５ａＨｚ　）は５０１１ｚのまま出力される。Among the vertical synchronization signals, the high frequency NTSC signal (60H
z) is divided by the monostable multivibrator 3 and s
It becomes oHz. The time constant of the monostable multivibrator 3 is determined by the PAL signal (50
Hz) is set so as not to be divided. Therefore, P.A.
The L signal (5aHz) is output as 5011z.

この出力は微分回路４を通すコン）ｃｒ−ルバルスト１
６１１　ｅ　＜らいのパルス幅に成形され、スイッチ回
路５に入力される。一方コントロールパルスも同シくス
イッチ回４５に入力され記録時には上記画直ＩＷ１期信
号のパルスが出力され、再生時にはコントａ−ルバルス
が出力されるように切換られる。周波数判別回路６の出
力は再生時に閉じられるスイッチ回路７により帰還され
、第１図のような特性を有している。紀鐘時忙は周波数
判別回路６の出力は帰還されず、　８４Ｌ！ｉｉ２のよ
うな特性な有している従って周波数判別回路において判
別する周波数と鉄製信号の関係は、記遥と再生で同じと
なる。This output is passed through the differentiating circuit 4.
The signal is shaped into a pulse width of 611 e < leprosy and input to the switch circuit 5 . On the other hand, the control pulse is also inputted to the switch circuit 45, and the pulse of the image correction IW1 period signal is outputted during recording, and the control pulse is outputted during reproduction. The output of the frequency discrimination circuit 6 is fed back by a switch circuit 7 which is closed during reproduction, and has characteristics as shown in FIG. During the alarm clock, the output of the frequency discrimination circuit 6 is not fed back, and 84L! Therefore, the relationship between the frequency discriminated by the frequency discrimination circuit and the iron signal is the same for recording and reproduction.

以上述べたように、本）Ｒｉ＠／Ｉｃよれば単安定マル
チバイブレータで垂直同期信号を分周すれば判別する周
波数と映像信号の関係が同じとなり周波数判別回路が記
録、再生兼用となり、回路が簡略化できる着果がある。As mentioned above, according to Ri@/Ic, if the vertical synchronization signal is divided by a monostable multivibrator, the relationship between the frequency to be determined and the video signal will be the same, and the frequency determination circuit will be used for both recording and playback, and the circuit will become There are some results that can be simplified.

さらに記録時は６０Ｈｚと５０Ｈｚｔ−判別すればよい
から、従来の２５Ｈｚと５０Ｈｚを判別する方法より＃
ＩＴＩｊｌ数の判別が容易となる効果がある。Furthermore, when recording, it is only necessary to distinguish between 60Hz and 50Hz, so it is easier than the conventional method of distinguishing between 25Hz and 50Hz.
This has the effect of making it easier to determine the ITIjl number.

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

３１１！ｉｌは従来再生時に必要なテレビ信号判別回路
の特性な示す特性図、第２図は従来記録時に必要なテレ
ビ信号判別回路の特性図、第５図は本発明の−′４４瑚
例を示すプａｙり図、第４図は不発＠による記録時のテ
レビ１ざ号刊別回路の特性を示す特性図である。 １・・・コントロールパルス検ａｔｔｉｇ２・・・垂直
同期信号検出回路 ３・・・単安定マルチバイブレータ ４・・・微分回路 ５．７・・・スイッチ回路 ６・・・周波数判別回路 代理人弁理士　薄　１）刊、７−〒ト、第２図 １１ 第４０ 周波数（ＨＬン311! il is a characteristic diagram showing the characteristics of a television signal discriminating circuit necessary for conventional reproduction, FIG. 2 is a characteristic diagram of a conventional television signal discriminating circuit necessary for recording, and FIG. FIG. 4 is a characteristic diagram showing the characteristics of the circuit for each issue of TV 1 during recording by misfire@. 1...Control pulse detection 2...Vertical synchronization signal detection circuit 3...Monostable multivibrator 4...Differentiating circuit 5.7...Switch circuit 6...Frequency discrimination circuit Patent attorney Usui 1) Published, 7-〒T, Fig. 2 11 40th Frequency (HLN)

Claims (1)

【特許請求の範囲】[Claims] 画直同ｘＡ（１１号の周波数の異なる映像信号を、自励
的に４４Ｊ別し紀鐘再生する映ｇＩ紀嫌再生装置におい
て、４生時は磁気テープにミーされたコントロールパル
ス信号のＪ１１１波数を映像信号の判別信号とし、ミ一
時は、垂直同期信号の周波数の異なる映像信号のうち、
肩＃Ｌ数の高い垂直同期信号のみを分周するように時定
数をｔ＆足した単安定マルチパイグレータを介して分周
し７ｔｔＩＩ直同期信号の周波数を映像信号の判別信号
としたことを＊＊とする映像記録再生装置。In a video reproducing device that self-excitedly separates video signals with different frequencies of No. 11 into 44J and reproduces them, the J111 wave number of the control pulse signal applied to the magnetic tape is is the video signal discrimination signal, and Mi is the video signal with different vertical synchronization signal frequencies.
The frequency was divided through a monostable multipigrator with a time constant of t & added so as to divide only the vertical synchronization signal with a high shoulder #L number, and the frequency of the 7ttII direct synchronization signal was used as the video signal discrimination signal.* *Video recording and playback device.