JPS58116886A - Recording and reproducing system of video signal - Google Patents
Recording and reproducing system of video signalInfo
- Publication number
- JPS58116886A JPS58116886A JP21500581A JP21500581A JPS58116886A JP S58116886 A JPS58116886 A JP S58116886A JP 21500581 A JP21500581 A JP 21500581A JP 21500581 A JP21500581 A JP 21500581A JP S58116886 A JPS58116886 A JP S58116886A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- delay
- delay time
- video signal
- tape
- 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
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
- H04N5/91—Television signal processing therefor
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
Abstract
Description
【発明の詳細な説明】
本発明はビデオテープレコーダにおける映像信号の記録
再生方式の改良に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a video signal recording and reproducing method in a video tape recorder.
従来の例えば２ヘッド方式のビデオテープレコーダで映
像信号の記録を行なう場合、映像信号のチャンネル間の
水平方向のずれ（Ｈすね）はテープ送り速度で決まるた
め、そのテープ送り速度がＨ合せ（各チャンネル間の水
平方向のずれ調整）ができないような速度であると、テ
ープ上でのＨせができない。従って従来では、再生時の
クロストークを補償するため、第１チヤンネル又は第２
チヤンネルのＦＭ記録信号を−りだけシフトして記録し
たり、スチル、スロー等の特殊な再生を行なう場合には
αＨ（隣接トラックの水平同期信号のずれ）を補償する
ための回路が必要であった。When recording video signals using a conventional two-head video tape recorder, for example, the horizontal deviation (H shank) between channels of the video signal is determined by the tape feed speed. If the speed is such that it is not possible to adjust the horizontal deviation between channels, it will not be possible to perform H tracing on the tape. Therefore, conventionally, in order to compensate for crosstalk during playback, the first channel or the second
When recording by shifting the FM recording signal of a channel by -, or when performing special playback such as still or slow playback, a circuit to compensate for αH (displacement of horizontal synchronization signals of adjacent tracks) is required. Ta.
そこで、本発明者は先に出頭した特願昭％−１７６４５
１号の発明において上述した従来技術の欠点を改良する
ために、一方のチャンネルの映像信号をテープ送り速度
で決まるＨすね分だけ遅延させて記録し、他方のチャン
ネルの記録映像信号を遅延させて再生することにより、
記録時にテープパターン上で映像信号のチャンネル間の
Ｈ合せなできるようにした映像信号の記録再生方式を提
案した。Therefore, the inventor filed the patent application No. 17645 filed earlier.
In order to improve the above-mentioned drawbacks of the prior art in the invention No. 1, the video signal of one channel is recorded with a delay of H length determined by the tape feed speed, and the recorded video signal of the other channel is delayed. By playing,
We have proposed a video signal recording and reproducing method that allows H matching between video signal channels on a tape pattern during recording.
しかるに本発明者はこの方式を更に検討した結果、上記
記録時の遅延時間を自由に設定できないと、テープ送り
速度の設定（Ｈずれの程度）が限定されることが判明し
た。However, as a result of further study of this system, the inventors found that if the delay time during recording cannot be freely set, the setting of the tape feed speed (degree of H deviation) is limited.
本発明はかかる事由に鑑みてなされたもので、上述した
先願発明の如く、Ｈ合せがなされていないテープ送り速
度の場合、記録すべき映像信号を遅延させることにより
テープパターン上でＨ合せを行なう記録再生方式におい
て、上記映像信号の遅延時間をテープ送り速度に対応し
て任意に選択することができるように構成することによ
り自動的にＨずれの補償を可能ならしめたことを特徴と
する。The present invention has been made in view of the above circumstances, and when the tape feed speed is such that H alignment is not possible, as in the prior invention described above, H alignment is achieved on the tape pattern by delaying the video signal to be recorded. In the recording and reproducing method to be carried out, the delay time of the video signal is configured so that it can be arbitrarily selected in accordance with the tape feed speed, thereby making it possible to automatically compensate for H deviation. .
以下図面に示す実施例を参照して本発明を説明すると、
図において、Ｒは記録系、′Ｐは再生系を示す。記録系
Ｒで１は輝度信号入力端子、２はＦＭ変調器、３は混合
器、４は低域変換色信号発生器、５，７及び８は低域フ
ィルタ、６は遅延タップ付きＣ’ＣＤ遅延素−子、９及
び１ｏは記録用増幅器、ｌ】は記録時のチーブ速度選択
スイッチ（図示せず）に連動するＣＣＤの遅延時間選択
スイッチ、Ｃ？Ｈ１及びＣＨ２は第１及び第２チヤンネ
ルの映像信号録再ヘッドである。The present invention will be described below with reference to embodiments shown in the drawings.
In the figure, R indicates a recording system and 'P indicates a reproduction system. In the recording system R, 1 is a luminance signal input terminal, 2 is an FM modulator, 3 is a mixer, 4 is a low-pass conversion color signal generator, 5, 7 and 8 are low-pass filters, and 6 is a C'CD with delay tap. Delay elements 9 and 1o are recording amplifiers, 1] is a CCD delay time selection switch that is linked to a Chive speed selection switch (not shown) during recording, and C? H1 and CH2 are video signal recording/reproducing heads for the first and second channels.
また再生系Ｐで、１２及び１４は再生増幅器、１３及び
１５は低域フィルタ、１６は遅延タップ付きＣＣＤ遅延
素子、１７は低域フィルタ、１８は第１チヤンネルの再
生信号と第２チヤンネルの再生信号とを合成するための
合成用スイッチング回路、１９は再生時における記録速
度判定スイッチ（図示せず）に連動するＣＣＤの遅延時
間選択スイッチ、加は合成再生信号出力端子である。In addition, in the reproduction system P, 12 and 14 are regenerative amplifiers, 13 and 15 are low-pass filters, 16 is a CCD delay element with a delay tap, 17 is a low-pass filter, and 18 is a reproduction signal of the first channel and a reproduction signal of the second channel. 19 is a CCD delay time selection switch linked to a recording speed determination switch (not shown) during reproduction, and 19 is a composite reproduction signal output terminal.
記録系Ｒにおいて、入力端子゛ｌからの輝度信号はＦＭ
変調器２によりＦＭ変調されて混合器３に与えられる。In the recording system R, the luminance signal from the input terminal ``1'' is FM
The signal is FM-modulated by a modulator 2 and provided to a mixer 3.
混合器３はＦＭ変調された輝度信号と低域変換色信号発
生器４からの低域変換色信号とを混合する。。この混合
出力は第１チヤンネル側と第２チヤンネル側に分割され
、第１チヤンネル側のものは低域フィルタ５を介してＣ
ＣＤ遅延素子６に与え、前記テープ送り速度できるＨす
ね分だけ低域フィルタ出力を遅延させてから増幅器９に
加える。The mixer 3 mixes the FM modulated luminance signal and the low frequency conversion color signal from the low frequency conversion color signal generator 4. . This mixed output is divided into a first channel side and a second channel side, and the first channel side is filtered through a low-pass filter 5.
The low-pass filter output is applied to the CD delay element 6, and the low-pass filter output is delayed by an amount corresponding to the tape feed speed, and then applied to the amplifier 9.
これに対し第２チヤンネル側の混合出力は低域フィルタ
８を介して遅延させずにそのまま増幅器ｌＯに与える。On the other hand, the mixed output on the second channel side is passed through the low-pass filter 8 and fed directly to the amplifier IO without being delayed.
而してＣＣＤ遅延素子６の遅延時間はテープ速度に対応
するようにスイッチ１１によってＣＣＤ遅延素子６の遅
延タラ１６′を選択することにより決まるが、該タッグ
を設けるＣＣＤ遅延素子６のビット位置は次のようにし
て求める。The delay time of the CCD delay element 6 is determined by selecting the delay tag 16' of the CCD delay element 6 using the switch 11 so as to correspond to the tape speed, but the bit position of the CCD delay element 6 where the tag is provided is as follows. Find it as follows.
即ち、チーツー上の隣接トラックの水平同期信号ずｈα
）Ｉとテープ走行速度Ｖｔとの関係はＶｔ−αＨｆｖ・
（πＲ）２／（ｎａ±αａ）８ （４１で表わされ、α
Ｈ−（２ｒＬ−１）／２の時Ｈ合せが成立することは周
知である。That is, the horizontal synchronization signal hα of the adjacent track on the Qi2
) The relationship between I and tape running speed Vt is Vt-αHfv・
(πR)2/(na±αa)8 (represented by 41, α
It is well known that H alignment is established when H-(2rL-1)/2.
但し、ｖｔ：テープ走行速度、’ ｆｖ °：フィール
ド周波数、Ｒ二回転ドラムのシリンダ径、ｎＨ： １フ
イールドの走査線数、Ｗ：ビテオ幅、αＨ：隣接トラッ
クの水平同期信号ずれ
またＣＣＤ遅延素子の遅延時間は
二
ｆｃ ｆ２＋で近似でき、
該素子のピット数ルに対しクロック周波数ｆ。の選定は
回路系への影響を考慮して色副搬送波の整数倍に設定す
ることが多い。However, vt: tape running speed, ' fv °: field frequency, cylinder diameter of R two-rotation drum, nH: number of scanning lines in one field, W: video width, αH: horizontal synchronization signal deviation of adjacent tracks or CCD delay element. The delay time of can be approximated by 2fc f2+,
Clock frequency f for the number of pits of the element. is often set to an integral multiple of the color subcarrier in consideration of the influence on the circuit system.
かくして遅延タップ６′を設けるＣＣＤ遅延素子６０ビ
ツト位置上記（ｌｌ及び（２）式より求めることができ
る。Thus, the position of 60 bits of the CCD delay element where the delay tap 6' is provided can be determined from the above equations (ll and (2)).
なお、低域フィルタ５はＣＣＤ遅延素子６による遅延作
用を受ける出力に、その必要な帯域において折返し歪み
の成分で出てこないように、ＣＣＤ遅延素子６のタロツ
ク周波数ｆ。のｌ／２以下のカットオフ周波数を有する
ように構成されている。Note that the low-pass filter 5 adjusts the tarok frequency f of the CCD delay element 6 so that the output subjected to the delay action by the CCD delay element 6 does not appear as an aliasing distortion component in the necessary band. It is configured to have a cutoff frequency of 1/2 or less.
また低域フィルタ７は必要な帯域内ではないが、やはり
出力に現れる折返しの周波数成分を減衰させるための毛
のである。Although the low-pass filter 7 is not within the required band, it is used to attenuate the folded frequency components that appear in the output.
更に第２チヤンネル側の低域フィルタ８は第１チヤンネ
ル側と周波数帯域をそろえるためのものである。Further, the low-pass filter 8 on the second channel side is for aligning the frequency band with that on the first channel side.
増幅器９及び１０は第１及び第２チヤンネルのヘッドの
最適記録電流特性に合致するように、夫々の低域フィル
タ７．８の出力を増幅し、各ヘッドＣＩ″１１及びａ′
（２に配録電流を流す。Amplifiers 9 and 10 amplify the outputs of the respective low-pass filters 7.8 to match the optimum recording current characteristics of the heads of the first and second channels, and amplify the outputs of the respective heads CI''11 and a'.
(A distribution current is applied to 2.
上述のようにして映倫信号の記録が行なわれるが、この
ようにして記録された映像信号は下記のようにして再生
される。The video signal is recorded as described above, and the video signal recorded in this manner is reproduced as follows.
即ち再生系Ｐにおいて、第１チヤンネルのヘッドＣＨ，
の出力は再生増幅器１２により増幅され、低域フィルタ
１３に与えられる。That is, in the reproduction system P, the first channel head CH,
The output is amplified by a regenerative amplifier 12 and applied to a low-pass filter 13.
これに対し第２チヤンネルのヘッドＣＨ２の出力は再生
増幅器１４で増幅した後、低域フィルタ１５を介してＣ
ＣＤ遅延素子１６に与えられるが、この場合、記録時に
おける第１チヤンネル側の信号遅延時間と同じ時間だけ
遅延させるように、スイッチ１９によりＣＣＤ遅延素子
１６の遅延タップ１６を選択し、その遅延出力は低域フ
ィルタ１７に与えられる。On the other hand, the output of the head CH2 of the second channel is amplified by the regenerative amplifier 14 and then passed through the low-pass filter 15 to the C
In this case, the delay tap 16 of the CCD delay element 16 is selected by the switch 19 so as to delay the signal by the same time as the signal delay time on the first channel side during recording, and the delay output is applied to the CD delay element 16. is applied to the low-pass filter 17.
第１及び第２チヤンネルの低域フィルタ１３及び１７の
出力はスイッチング回路１８により交互に順次取出して
合成さね、出力端子四からは時間ずれのない再生映像信
号が得られる。ここで、低域フィルタ１５． １７は５
，７と、また低域フィルタ１３は８と、夫々同様の作用
を得るためのものである。The outputs of the low-pass filters 13 and 17 of the first and second channels are alternately and sequentially taken out and combined by the switching circuit 18, and a reproduced video signal without time lag is obtained from the output terminal 4. Here, the low-pass filter 15. 17 is 5
, 7 and the low-pass filter 13 and 8 are used to obtain the same effect.
なお上述した実施例ではテープ走行速度に応じた遅延時
間が得られるようにＣＣＤＣＣ遅延素子数のタップを設
けて選択可能とするとしたが、可変遅延手段として、は
ＣＣＤ遅延素子に限定されないこと勿論で、例えば、複
数の遅延時間の異なる遅延線を用意し、これらを前記ス
イッチによりテープ走行速度に応じて選択するように構
成してもよい。In the above-described embodiment, taps for the number of CCDCC delay elements are provided so that the delay time can be selected according to the tape running speed, but the variable delay means is of course not limited to CCD delay elements. For example, a plurality of delay lines having different delay times may be prepared, and one of these may be selected by the switch according to the tape running speed.
以上説明した所から明らかなように本発明によれば、記
録時にテープパターン上で映像信号のチャンネル間のＨ
合せができるので、テープ送り速度を自由に選定するこ
とができ、従来のように再生時におけるαＨの補正等は
不要となし得る。特に遅延手段としてＣＣＤ遅延素子を
用（・ねば、そのタップ位置をスイッチにより選択する
だけで、テープ速度で決まるテープパターン上で容易に
Ｈずれを補償できるので、非常に有効である。As is clear from the above explanation, according to the present invention, H between channels of video signals is created on a tape pattern during recording.
Since the adjustment can be made, the tape feeding speed can be freely selected, and there is no need to correct αH during playback as in the conventional case. In particular, using a CCD delay element as a delay means is very effective because H deviation can be easily compensated for on a tape pattern determined by the tape speed by simply selecting the tap position with a switch.
図は本発明の一実施例を示すブロック図である。
Ｒ・・・記録系、Ｐ・・・再生系、ＣＴ（ｌ、 ＣＨ
２・・・録再ヘッド、６，１６・・・ＣＣＤ遅延素子、
１１．１９・・・遅延時間選択スイッチ。The figure is a block diagram showing one embodiment of the present invention. R...recording system, P...playback system, CT(l, CH
2... Recording/reproducing head, 6, 16... CCD delay element,
11.19...Delay time selection switch.
Claims (2)
決まるＨすね分だけ遅延させて記録し、他方のチャンネ
ルの記録映像信号を上記記録時の遅延時間と同一時間だ
け遅延させて再生するようにし、かつ上記遅延時間をテ
ープ送り速度に応じて選択することを特徴とする映像信
号の記録再生方式。(1) The video signal of one channel is recorded with a delay of H length determined by the tape feed speed, and the recorded video signal of the other channel is played back with a delay of the same amount of time as the delay time during recording. , and the delay time is selected according to a tape feeding speed.
素子のタップ位置を選択するスイッチとにより行なうこ
とを特徴とする特許請求の範囲第（１）項記載の映像信
号の記録再生方式。(2) The video signal recording and reproducing method according to claim (1), wherein the delay is performed by a CCD delay element with a delay tap and a switch for selecting the tap position of the element.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21500581A JPS58116886A (en) | 1981-12-29 | 1981-12-29 | Recording and reproducing system of video signal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21500581A JPS58116886A (en) | 1981-12-29 | 1981-12-29 | Recording and reproducing system of video signal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS58116886A true JPS58116886A (en) | 1983-07-12 |
Family
ID=16665125
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21500581A Pending JPS58116886A (en) | 1981-12-29 | 1981-12-29 | Recording and reproducing system of video signal |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58116886A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60111302A (en) * | 1983-11-21 | 1985-06-17 | Victor Co Of Japan Ltd | Video signal processing unit |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5336210A (en) * | 1976-09-15 | 1978-04-04 | Sony Corp | Magnetic recorder |
-
1981
- 1981-12-29 JP JP21500581A patent/JPS58116886A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5336210A (en) * | 1976-09-15 | 1978-04-04 | Sony Corp | Magnetic recorder |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60111302A (en) * | 1983-11-21 | 1985-06-17 | Victor Co Of Japan Ltd | Video signal processing unit |
| JPH0414406B2 (en) * | 1983-11-21 | 1992-03-12 | Victor Company Of Japan |
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