JPS5864884A - Video recording and reproducing device - Google Patents
Video recording and reproducing deviceInfo
- Publication number
- JPS5864884A JPS5864884A JP56162831A JP16283181A JPS5864884A JP S5864884 A JPS5864884 A JP S5864884A JP 56162831 A JP56162831 A JP 56162831A JP 16283181 A JP16283181 A JP 16283181A JP S5864884 A JPS5864884 A JP S5864884A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- frequency
- circuit
- recording
- video
- 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.)
- Granted
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
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
Abstract
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.
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)
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.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP56162831A JPS5864884A (en) | 1981-10-14 | 1981-10-14 | Video recording and reproducing device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP56162831A JPS5864884A (en) | 1981-10-14 | 1981-10-14 | Video recording and reproducing device |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5864884A true JPS5864884A (en) | 1983-04-18 |
JPS6337552B2 JPS6337552B2 (en) | 1988-07-26 |
Family
ID=15762065
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP56162831A Granted JPS5864884A (en) | 1981-10-14 | 1981-10-14 | Video recording and reproducing device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5864884A (en) |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5028941A (en) * | 1973-07-17 | 1975-03-24 |
-
1981
- 1981-10-14 JP JP56162831A patent/JPS5864884A/en active Granted
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5028941A (en) * | 1973-07-17 | 1975-03-24 |
Also Published As
Publication number | Publication date |
---|---|
JPS6337552B2 (en) | 1988-07-26 |
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