JPS60105394A - Video signal recording and reproducing device - Google Patents

Video signal recording and reproducing device

Info

Publication number
JPS60105394A
JPS60105394A JP58212819A JP21281983A JPS60105394A JP S60105394 A JPS60105394 A JP S60105394A JP 58212819 A JP58212819 A JP 58212819A JP 21281983 A JP21281983 A JP 21281983A JP S60105394 A JPS60105394 A JP S60105394A
Authority
JP
Japan
Prior art keywords
signal
circuit
recording
color
output
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
JP58212819A
Other languages
Japanese (ja)
Inventor
Kunihiko Mototani
本谷 邦彦
Yoshiya Takemura
佳也 竹村
Hideo Okamura
岡村 英夫
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP58212819A priority Critical patent/JPS60105394A/en
Publication of JPS60105394A publication Critical patent/JPS60105394A/en
Pending legal-status Critical Current

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  • Optical Recording Or Reproduction (AREA)
  • Signal Processing Not Specific To The Method Of Recording And Reproducing (AREA)

Abstract

PURPOSE:To obtain the good picture quality even when the S/N of the low-pass frequency is inferior by recording near the outer circumference of the disc for the luminance signal with the necessary wide frequency band to reproduce the record and by recording near the inner circumference for the color signal with the narrow frequency band. CONSTITUTION:Terminals 50-53 are video input terminals, and NTSC composite video signal added to a terminal 50 is divided to a luminance signal Y2 and 2 color difference signals I2 and Q2 with a decoder 63. Switches 60, 61 and 62 select the video input signal. The output of a switch 60, namely, a Y signal FM-modulates with a Y luminance signal record circuit 64, the output I signal of a switch 61 FM-modulates with an I record circuit 65 and the output Q signal of a switch 62 FM-modulates with a Q record circuit 66. Respective outputs of switches 61 and 62 are added to a time base pressing circuit 67, and the output signal is FM-modulated with a color signal record circuit 72. Respective output signals of a luminance signal record circuit and switch 71 are added to a luminance signal semiconductor laser drive circuit 73 and a color signal semiconductor laser drive circuit 75 and record to the disc.

Description

【発明の詳細な説明】 産業上の利用分野 本発明は、従来よりビデオディスクの例にみられるよう
に、円盤上記録媒体〈以下ディスクと称′!l)にレー
ザーの如き光ビーム、または、機械的に同心円状または
スパイラル状の記録軌跡として映像信号を高密瓜に記録
再生を行なう装置または再生のみを行なう装置に関する
ものである。
DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is applicable to a disk-based recording medium (hereinafter referred to as a disk), as conventionally seen in the example of a video disk. 1) The present invention relates to a device for recording and reproducing video signals in a high-density manner using a light beam such as a laser, or mechanically as a concentric or spiral recording locus, or a device that only performs reproduction.

従来例の構成とその問題点 映像信号の記録再生装置または再生のみを行なう′@置
の一例としで、光源にレーリ゛を用いて、一定速度で回
転するディスクに映像信号を記録または再生を行なう映
像信号記録再生装置について説明する。このような映像
信号記録再生装置において、映像信号を記録する場合、
映像信号を適当な周波数のキャリア信号でFM変調し、
これをリミッタ等で2饋イ3号に変模し、記録ビット長
の長短として記録再生することが行なわれる。また、こ
のように映像信号を記録覆る場合のカラー仏門の処理方
法として、ダイレクトF M方式、ベリラドクロマ方式
、低域変換方式等あるが、ここでは−例として低域変換
方式を用いて映像信号をディスクに記録再生でる場合に
ついて述べる。
Conventional configurations and their problems As an example of a video signal recording/reproducing device or a system that only performs reproduction, a Rayleigh is used as a light source to record or reproduce video signals on a disk that rotates at a constant speed. A video signal recording and reproducing device will be explained. When recording a video signal in such a video signal recording and reproducing device,
FM modulates the video signal with a carrier signal of an appropriate frequency,
This is changed to 2×3 using a limiter or the like, and recording and reproduction is performed by changing the recording bit length. In addition, as a color processing method for recording video signals in this way, there are direct FM method, Verirad chroma method, low frequency conversion method, etc. Here, as an example, the video signal is processed using the low frequency conversion method. Let's discuss the case of recording and playing back on a disc.

第1図に、従来例として低域′gJ換方式を用いて映像
信号を光学的に記録再生する映像信号記録再生装置の構
成図を示し、第2図に、低域変換方式の映像信号処理回
路の各部のスペクトラムを示す。
Fig. 1 shows a configuration diagram of a conventional video signal recording and reproducing device that optically records and reproduces video signals using the low-frequency conversion method, and Fig. 2 shows the video signal processing using the low-frequency conversion method. Shows the spectrum of each part of the circuit.

第1図において、1〜8は記録するための映像信号処理
回路のブロック図、9〜25はディスクに記録再生する
ための記録再生装置のブロック図、26〜34はディス
クからの再生信号をもとの映像信号に変換するための映
像信号処理回路のブロック図である。端子Aには、NT
SC映像信号等の映像信号を人力1り。そのスペクトラ
ムを第2図aに示づ。第2図aにおいて、Yは輝度信号
成分、Cは3.5[IMHzカラー信号成分である。端
子Aに入力した映像信号は、ローパスフィルタ1、バン
ドパスフィルタ4で輝度信号と3.58MHzカラー信
号に分離する。それぞれのスペクトラムを第2図のす、
dに示す。分離した輝度信号はAGC回路、プリエンフ
ァシス回路、クランプ回路、ホワイトクリップ、ダーク
クリップ回路等で構成する輝度信号処理回路2を介して
FM変調回路3に入力する。FM変調回路3では、任意
の周波数キャリヤで輝瓜信号をFM変調する。このFM
変調信号のスペクトラムを第2図Cに示す。一方バンド
パスフィJレタ4で′分離した3、 58 M +−1
7力ラー信号は、ACC回路、APC−AFC回路、平
衡変調器等で構成されるカラー信号処理回路5で低域カ
ラー信号〈例えば629KH2)に変換する。
In FIG. 1, 1 to 8 are block diagrams of video signal processing circuits for recording, 9 to 25 are block diagrams of recording and reproducing devices for recording and reproducing on a disc, and 26 to 34 are block diagrams of video signal processing circuits for recording and reproducing signals from the disc. FIG. 2 is a block diagram of a video signal processing circuit for converting the video signal into a video signal. Terminal A has NT
Video signals such as SC video signals can be generated by one person. The spectrum is shown in Figure 2a. In FIG. 2a, Y is the luminance signal component and C is the 3.5 [IMHz color signal component]. The video signal input to terminal A is separated into a luminance signal and a 3.58 MHz color signal by a low-pass filter 1 and a band-pass filter 4. The respective spectra are shown in Figure 2.
Shown in d. The separated luminance signal is input to the FM modulation circuit 3 via a luminance signal processing circuit 2 comprising an AGC circuit, a pre-emphasis circuit, a clamp circuit, a white clip circuit, a dark clip circuit, and the like. The FM modulation circuit 3 performs FM modulation on the melon signal using an arbitrary frequency carrier. This FM
The spectrum of the modulated signal is shown in FIG. 2C. On the other hand, 3' separated by band pass filter J letter 4, 58 M +-1
The color signal is converted into a low-frequency color signal (for example, 629KH2) by a color signal processing circuit 5 that includes an ACC circuit, an APC-AFC circuit, a balanced modulator, and the like.

そのスペクトラムを第2図eに示づ。バンドパスフィル
タ6は低域カラー信号に変換したカラー信号のみを抽出
するフィルタである。次に、FM変調回路3からのFM
変調信号とバンドパスフィルタ6からの低域カラー信号
とを記録回路7に入力し、両信号を混合して記録信号を
形成する。記録信号のスペクトラムを第2図f1波形例
を9に示す。第2図0においてイがカラー信号成分であ
り、口がFM変調した輝度信号成分である。記録回路7
の出力信号はディスクに記録すべき光ビームを発生ずる
光源9(例えば半導体レーザ)を駆動づる半導体レーザ
駆動回路8に入力する。光源9から発光した光ビームは
点線0で示1・光学系でI II程度の微少光に絞って
ディスク15に照射する。ディスク15には、同心円状
またはスパイラル状の案内1〜ラツクが形成されており
、文名々の案内トラックには個有の番地信号が予め設け
である。またディスク15には回転始端位置を示すVマ
ーク信号18が予め形成されている。ディスク15は、
そのVマーク信号18をVマーク検出回路19で検出し
、モータ1G、モータ制御回路17によって一定速度(
例えば1800rpm )で回転する。
The spectrum is shown in Figure 2e. The bandpass filter 6 is a filter that extracts only the color signal converted into a low-pass color signal. Next, the FM from the FM modulation circuit 3
The modulation signal and the low-frequency color signal from the bandpass filter 6 are input to a recording circuit 7, and both signals are mixed to form a recording signal. The spectrum of the recording signal is shown in FIG. 2, and an example of the f1 waveform is shown in 9. In FIG. 20, A is the color signal component, and the mouth is the FM-modulated luminance signal component. Recording circuit 7
The output signal is input to a semiconductor laser drive circuit 8 that drives a light source 9 (for example, a semiconductor laser) that generates a light beam to be recorded on the disc. The light beam emitted from the light source 9 is shown by a dotted line 0 1. An optical system narrows the light beam to a very small light beam of about I II and irradiates it onto the disk 15 . Concentric or spiral guides 1 to 1 are formed on the disk 15, and each guide track for each sentence is provided with a unique address signal in advance. Further, a V mark signal 18 indicating the rotation start position is previously formed on the disk 15. The disk 15 is
The V mark signal 18 is detected by the V mark detection circuit 19, and the motor 1G and the motor control circuit 17 are operated at a constant speed (
For example, it rotates at 1800 rpm).

光学系0は、一般的に、光源9、レンズ10.ビームス
プリッタ11、トラッキングミラー12、集光レンズ1
3、レンズ14等で構成する。また光学系Oはりニアモ
ータ及びステップモータ等で構成する移送系24、およ
び駆動回路25でディスク15の径方向に移送される。
The optical system 0 generally includes a light source 9, a lens 10 . Beam splitter 11, tracking mirror 12, condenser lens 1
3. It is composed of a lens 14 and the like. Further, the optical system O is transported in the radial direction of the disk 15 by a transport system 24 composed of a linear motor, a step motor, etc., and a drive circuit 25.

記録する時は、前記記録回路7からの記録信号で光源9
からの出力光ビームを変調し、レンズ10、ビームスプ
リッタ11を介して1〜ラツキングミラー12に照射す
る。1へラッキングミラー12は光ビームをディスク1
5の径方向に移動させ、記録すべきトラックに光ビーム
が照射するようにトラッキング制御する。また、集光レ
ンズ13をディスク15に対して上下方向に移動させ、
最適焦点位置で記録または再生舊るようにフォーカス制
御を行ない、ディスク15に記録する。再生づ”る場合
【ま、光源9から照射した弱い光ビームをレンズ10、
ビームスプリッタ11、トラッキングミラー12、集光
レンズ13を介して記録の時と同様な制御を行なってデ
ィスク15に照射し、その反射光を集光−レンズ13、
トラッキングミラー12を介してビームスプリッタ11
で分割し、レンズ14を介して光電変換器20で受光す
ることによって電気信号に変換する。電気信号に変換さ
れた再生信号はヘッドアンプ21で増幅し補償回路26
へ入力する。補償回路26でtま再生信号の周波数特性
等の補償を行なう。次に、再生信号の輝度信号成分のみ
を抽出するバイパスフィルタ27および低域変換したカ
ラー信号成分のみを抽出するローパスフィルタ31に入
力する。次に、バイパスフィルタ27ににり出力した輝
度信号成分は、リミッタ28で波形整形を行ない、F 
M IM調回路29でもとの輝度信号に復調する。役調
した輝度信号は輝度信号記録回路30でディエンフアシ
ス、ノイズキャンセル等を行ない、混合回路34へ入力
する。
When recording, the light source 9 is activated by the recording signal from the recording circuit 7.
The output light beam is modulated and irradiated onto racking mirrors 1 to 12 via a lens 10 and a beam splitter 11. The racking mirror 12 directs the light beam to the disk 1.
5 in the radial direction, and tracking control is performed so that the light beam irradiates the track to be recorded. Further, the condensing lens 13 is moved vertically with respect to the disk 15,
Focus control is performed so that recording or reproduction is performed at the optimum focus position, and recording is performed on the disk 15. In the case of reproduction [well, the weak light beam irradiated from the light source 9 is transmitted to the lens 10,
The beam splitter 11, the tracking mirror 12, and the condensing lens 13 are used to irradiate the disk 15 with the same control as during recording, and the reflected light is condensed by the condensing lens 13,
Beam splitter 11 via tracking mirror 12
The received light is received by a photoelectric converter 20 via a lens 14 and converted into an electrical signal. The reproduced signal converted into an electric signal is amplified by the head amplifier 21 and sent to the compensation circuit 26.
Enter. A compensation circuit 26 compensates for the frequency characteristics, etc. of the reproduced signal. Next, the signal is input to a bypass filter 27 that extracts only the luminance signal component of the reproduced signal and a low-pass filter 31 that extracts only the low-pass converted color signal component. Next, the luminance signal component outputted to the bypass filter 27 undergoes waveform shaping in the limiter 28, and
The MIM modulation circuit 29 demodulates the original luminance signal. The adjusted luminance signal undergoes de-emphasis, noise cancellation, etc. in a luminance signal recording circuit 30, and is input to a mixing circuit 34.

一方、ローパスフィルタ31で抽出された低域カラー信
号成分は、ACC回路、APC−AFC回路等で構成づ
るカラー信号処理回路32でもとの3.58MHzカラ
ー信号に変換する。バンドパスフィルタ33は3.58
 M +−IZカラー信号のみを抽出するフィルタであ
る。次に、混合回路34で、復調した輝度信号と3.5
8 、M HZカラー信号を混合し、出力I!l!像信
号として端子Bより出力する。
On the other hand, the low-pass color signal component extracted by the low-pass filter 31 is converted into the original 3.58 MHz color signal by a color signal processing circuit 32 composed of an ACC circuit, an APC-AFC circuit, etc. Bandpass filter 33 is 3.58
This is a filter that extracts only the M+-IZ color signal. Next, in the mixing circuit 34, the demodulated luminance signal and 3.5
8, mix the MHZ color signal and output I! l! Output from terminal B as an image signal.

一方ディスク15に予め形成されている番地信号は、映
像信号を再生する時と同様に、光電変換器20で受光し
、ヘッドアンプ21で増幅し、番地整形回路22で波形
整形を行ない、マイクロコンピュータ等で構成するコン
ト0−523で読取判定を行なう。また、コントローラ
23はモータ制御回路17の回転制御や移送系24の移
送制御等のあらゆる制御を行なう。
On the other hand, the address signal pre-formed on the disk 15 is received by a photoelectric converter 20, amplified by a head amplifier 21, waveform-shaped by an address shaping circuit 22, and processed by a microcomputer in the same way as when reproducing a video signal. The reading judgment is made using controls 0-523 consisting of the following. Further, the controller 23 performs various controls such as rotation control of the motor control circuit 17 and transfer control of the transfer system 24.

以上説明したような低域変換方式による映像信号の記録
再生においては、記録再生の過程に比較的周波数の低い
所に雑音が多く存在する場合には色信号のS/N比が悪
くなる。このような問題を解決するには、ダイレクトF
 M方式が望ましいが、この場合には記録再生の周波数
帯域が広がるという欠点を有する。
In recording and reproducing video signals using the low frequency conversion method as described above, if there is a lot of noise at relatively low frequencies during the recording and reproducing process, the S/N ratio of the color signal will deteriorate. To solve such problems, direct F
Although the M method is desirable, this method has the disadvantage that the frequency band for recording and reproduction is widened.

発明の目的 本発明は、記録再生の周波数帯域がダイレクトFM方式
を用いるには狭く、低域周波数のS/N比が悪くて低域
変換方式では十分な画質が得られない場合に、良好な画
質を得る紀録再生装(dを提供するものである。
Purpose of the Invention The present invention provides a method for achieving good image quality when the frequency band for recording and reproduction is too narrow to use the direct FM method and the low frequency S/N ratio is poor and sufficient image quality cannot be obtained using the low frequency conversion method. It provides a record playback device (d) that obtains image quality.

さらに円盤状配録媒体を一定の回転数で用いる場合には
、外周と内周では使用できる周波数帯域が異なるという
問題があり、本発明はこのJ:うな問題を解決する映像
信号の記録再生装置を11?供するものである。
Furthermore, when a disk-shaped recording medium is used at a constant rotation speed, there is a problem that the frequency bands that can be used on the outer and inner circumferences are different. 11? This is what we provide.

発明の構成 −1−2目的を達成するために、本発明は、ディスクに
映像信号を記録再生する場合に、輝度信号と色信号をそ
れぞれ別個の記録再生ヘッドを用い、記録再生に必要な
周波数帯域が広い輝度信号に対してはディスクの外周に
近い側に記録し、周波数帯域が狭い色信@tこ対しては
内周に近い側に記録づるように構成したものである。
Structure of the Invention-1-2 In order to achieve the object, the present invention uses separate recording and reproducing heads for a luminance signal and a color signal when recording and reproducing video signals on a disk, and the frequency required for recording and reproducing is adjusted. A luminance signal with a wide band is recorded on the side near the outer circumference of the disk, and a color signal with a narrow frequency band is recorded on the side near the inner circumference.

実施例の説明 以下本発明の一実施例を図面に基づいて説明づる。第3
図は映像信号の処理部分についてのみ示し、サーボ系に
ついては省略した。
DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. Third
The figure shows only the video signal processing part, and the servo system is omitted.

第3図において、端子50〜53は映像入力端子で、端
子50に加えられたNTSC複合映像信号はデユーダ6
3で輝度信号Y2と2つの色差信号 I2゜Q2に分1
111する。スイッチ60.61.、62は映像入力信
号がNTSC複合映像信号によるものか、端子50、5
1 、52のそれぞれにY1信号、11信号、Q1信号
が加えられたものかを選択するスイッチであり、前者の
場合スイッチ60,61.62は第3図に示すように端
子54.56.58側に倒れている。NTSC複合映像
信号入力の場合は端子55.57.59側に倒れている
。スイッチ60の出力即ちY信号は輝度信号記録回路6
4でFM変調し、スイッチ61の出力即ち1信号はI記
録回路65でF−’ M変調を、スイッチ62の出力即
らC信号はQ記録回路66でFM変調する。
In FIG. 3, terminals 50 to 53 are video input terminals, and the NTSC composite video signal applied to the terminal 50 is transmitted to the duplexer 6.
3, the luminance signal Y2 and the two color difference signals I2゜Q2 are divided into 1
111. Switch 60.61. , 62 indicates whether the video input signal is an NTSC composite video signal or not.
This switch selects whether the Y1 signal, 11 signal, or Q1 signal is added to the terminals 1 and 52, respectively. In the former case, the switches 60, 61, and 62 are connected to the terminals 54, 56, and 58 as shown in FIG. It's falling to the side. In the case of NTSC composite video signal input, it is on the terminal 55, 57, 59 side. The output of the switch 60, that is, the Y signal, is sent to the luminance signal recording circuit 6.
The output of the switch 61, that is, the 1 signal, is subjected to F-'M modulation in the I recording circuit 65, and the output of the switch 62, that is, the C signal, is subjected to FM modulation in the Q recording circuit 66.

1.0記録回路65 、66の出力信号は加篩回路68
で加棹する。第4図aは輝度信号記録回路64の周波数
スペクトルを、第4図すは加ty回路68の周波数スペ
クトルを示す。色信号(C信号)は第4図りのように異
なったFMキ1アリアで変調を行なっている。
1.0 The output signals of the recording circuits 65 and 66 are sent to the sieving circuit 68.
I'm going to do some heavy lifting. 4A shows the frequency spectrum of the luminance signal recording circuit 64, and FIG. 4A shows the frequency spectrum of the addition circuit 68. The chrominance signal (C signal) is modulated by different FM key areas as shown in the fourth diagram.

またスイッチ61.62の各出力を時間軸圧紺1回路6
7に加え、この出力信号を色信号記録回路72で[M変
調する。第4図c、dはこの様子を示したものである。
In addition, each output of the switches 61 and 62 is connected to the time axis pressure 1 circuit 6.
7, this output signal is subjected to M modulation in the color signal recording circuit 72. Figures 4c and 4d show this situation.

第4図c、dに示すI信号、Q信号略ま、第4図eに示
ずように、それぞれを時間軸圧縮して多重する。第4図
fは色信号記録回路72の出力信号の周波数スペクトル
を示している。スイッチ71は端子69.70のいずれ
かを選択することにまり、■信号、C信号が第4図りま
たはfのいずれの寸法で処理されたかを選択する。輝度
信号記録回路、スイッチ71の各出力信号は輝度信号半
導体レーザー駆動回路73、色信号半導体レーザー駈仙
回路75に加え、その各出力信号で輝度信号光学ヘッド
74、色信号光学ヘッド76を用いて、ディスクに輝度
信号(Y信号)及び色信号(C信号)を記録する。
The I and Q signals shown in FIGS. 4c and d are time-base compressed and multiplexed, respectively, as shown in FIG. 4e. FIG. 4f shows the frequency spectrum of the output signal of the color signal recording circuit 72. The switch 71 selects either the terminals 69 or 70, and selects whether the (2) signal or the C signal is processed in the fourth dimension or (f). Each output signal of the luminance signal recording circuit and the switch 71 is processed by a luminance signal semiconductor laser drive circuit 73 and a color signal semiconductor laser circuit 75, as well as a luminance signal optical head 74 and a color signal optical head 76 using the respective output signals. , a luminance signal (Y signal) and a color signal (C signal) are recorded on the disk.

第5図はディスク15、モーター16および輝度信号光
学ヘッド74、色信号光学ヘッド76のブロック図で、
第1図の従来例とは、光学ヘッドが2ケになっている点
が異なるところである。
FIG. 5 is a block diagram of the disk 15, motor 16, brightness signal optical head 74, and color signal optical head 76.
The difference from the conventional example shown in FIG. 1 is that there are two optical heads.

第6図はディスク15の平面図で、ディスク15の外周
側の第1の領域には、輝度信号を輝度信号光学ヘッドを
用いて記録し、第1の領域(I)より内側の第2の領域
(If)には、色信号を色信号光学ヘッドを用いて記録
する。
FIG. 6 is a plan view of the disc 15, in which a luminance signal is recorded in a first area on the outer circumferential side of the disc 15 using a luminance signal optical head, and a luminance signal is recorded in a second area inside the first area (I). A color signal is recorded in the area (If) using a color signal optical head.

このようにディスク15に記録された輝度信号、色信号
は、輝度信号光学ヘッド74および色信号光学ヘッド7
6内の光電変換器20で再生し、それぞれ輝度信号ヘッ
ドアンプ77、色信号ヘッドアンプ78で増幅する。t
ii信号ヘッドアンプ77の出力は輝度信号再生回路7
9でFM検波を行ない輝度信号を得る。この出力は加粋
回路88に加える。一方角信号ヘッドアンプ78の出力
は、■再生回路80、Q再生回路81でそれぞれFM検
波を行ない、色差信号のI信号、C信号を得ると同時に
、色信号再生回路83に加えて色信号を1qる。I再生
回路80、Q p3生回路81の出力は色信号変調回路
84に加えて3.58MHzに変調された色信号を得る
。色信号再生回路83の出力は、第4図eに示す信号で
あるため、時間軸伸張回路82に加えて第4図c、dに
示すI信号、C信号を得る。この出力は色信号変調回路
90に加えて、1信8、Q (ci 弓を3.58 M
 l−12のキャリアを用いて直角2相変調し3.58
MHz色信号を得る。スイッチ87では※i:子85.
86のいずれか一方を選択する。叩ら映像信号が第1図
a。
The luminance signal and chrominance signal recorded on the disk 15 in this way are transmitted to the luminance signal optical head 74 and the chrominance signal optical head 7.
The signal is reproduced by the photoelectric converter 20 in the photoelectric converter 6, and amplified by the luminance signal head amplifier 77 and color signal head amplifier 78, respectively. t
The output of the ii signal head amplifier 77 is sent to the luminance signal reproducing circuit 7.
9 performs FM detection to obtain a luminance signal. This output is applied to a summation circuit 88. The output of the one-sided signal head amplifier 78 is subjected to FM detection in a reproducing circuit 80 and a Q reproducing circuit 81, respectively, to obtain I and C signals of color difference signals, and at the same time, it is sent to a color signal reproducing circuit 83 to receive a color signal. 1 q. The outputs of the I reproduction circuit 80 and the Qp3 generation circuit 81 are added to the color signal modulation circuit 84 to obtain a color signal modulated at 3.58 MHz. Since the output of the color signal reproduction circuit 83 is the signal shown in FIG. 4e, in addition to the time axis expansion circuit 82, the I signal and C signal shown in FIG. 4c and d are obtained. In addition to the color signal modulation circuit 90, this output is added to the color signal modulation circuit 90.
Quadrature two-phase modulation using l-12 carrier 3.58
Obtain MHz color signal. At switch 87 *i: Child 85.
86. The hit video signal is shown in Figure 1a.

bの形成で記録されている場合は、スイッチ87は端子
85側に倒れており、色信号が第4図fの形式で記録さ
れている場合は、スイッチ87は端子8G側に倒れてい
る。スイッチ87の出力は加輝回路88の一方の入力端
子に加え、そのまま信号としてNTSC映像信号をj9
る。
When the color signal is recorded in the format shown in FIG. 4F, the switch 87 is tilted toward the terminal 85, and when the color signal is recorded in the format shown in FIG. 4F, the switch 87 is tilted toward the terminal 8G. The output of the switch 87 is added to one input terminal of the brightening circuit 88, and the NTSC video signal is directly input as a signal.
Ru.

発明の効果 以上本発明によれば、映像信号を2ヘッド方式で記録J
る場合に、周波数帯域の広い輝度信号をディスクの外周
側に、周波数帯域の狭い色信号を内周側に記録するので
、良好な映像信号の記録再生が行なえる。なぜなら、記
録再生の周波数帯域はディスクの外周側で広く、内周側
で狭いためである。
Effects of the Invention According to the present invention, video signals can be recorded using a two-head system.
In this case, a luminance signal with a wide frequency band is recorded on the outer circumferential side of the disk, and a color signal with a narrow frequency band is recorded on the inner circumferential side of the disk, so that good video signal recording and reproduction can be performed. This is because the frequency band for recording and reproduction is wide on the outer circumference side of the disk and narrow on the inner circumference side.

即ち、輝度信号を記録再生するのに内周側も使うとすれ
ば、ディスクで記録再生に使用できる領域は内周側で狭
くなるが、本発明のように必要周波数帯域の狭い色信号
をディスクの内周側に記録すれば、ディスクの中心に近
い所まで使用できるためディスクを有効に利用すること
ができる。
That is, if the inner circumference side is also used to record and reproduce luminance signals, the area that can be used for recording and reproduction on the disk becomes narrower on the inner circumference side. By recording on the inner circumferential side of the disc, the disc can be used close to the center of the disc, making effective use of the disc.

本発明は、映像信号をダイレクトFM方式で記録するに
は、系の周波数帯域が狭く、低域変換方式では良好な映
像信号の記録再生できない場合に有効である。色信号を
時分割多重して記録再生する方式は、2つの色差信号を
それぞれFM変調して多重する方式に比べて、モアレの
少ない食好な画質を得ることができる。
The present invention is effective when the frequency band of the system is narrow to record a video signal using the direct FM method, and good video signal recording and reproduction cannot be achieved using the low frequency conversion method. A method of recording and reproducing color signals by time-division multiplexing can obtain a more pleasing image quality with less moiré than a method of FM modulating and multiplexing two color difference signals.

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

第1図は従来例の低域変換り式による記録再生のブロッ
ク図、第2図は映像信号の記録再生時のスペクトルを説
明する図、第3図は本発明による信号処理を説明するブ
ロック図、第4図は映像信号の信号処理方式を説明する
図、第5図はディスクおよび光学ヘッドを説明する図、
第6図は輝m信号及び色信号のディスク」、での記録?
Ij /l:促)域を示す図である。 64・・・輝度信号配録回路、65・・・l記録回路、
66・・・Q記録回路、61・・・時間軸圧縮回路、7
2・・・色信号記録回路、74・・・輝度信号光学ヘッ
ド、76・・・(’2 (i+ j3光学ヘッド 代理人 森 本 八 弘 第4図 〈 。 1コー〜−へ)− 第5図 第6図
Fig. 1 is a block diagram of recording and reproducing using a conventional low-frequency conversion method, Fig. 2 is a diagram illustrating a spectrum during recording and reproducing a video signal, and Fig. 3 is a block diagram illustrating signal processing according to the present invention. , FIG. 4 is a diagram explaining the signal processing method of the video signal, FIG. 5 is a diagram explaining the disk and the optical head,
Figure 6 shows the recording of the luminance m signal and chrominance signal on the disc.
It is a figure showing an Ij/l: prompt) area. 64... Luminance signal distribution circuit, 65... l recording circuit,
66...Q recording circuit, 61...time axis compression circuit, 7
2... Color signal recording circuit, 74... Luminance signal optical head, 76... ('2 (i+j3 optical head representative Yahiro Morimoto Figure 4〈. 1 Cor ~ -) - 5th Figure 6

Claims (1)

【特許請求の範囲】 1、円盤状記録媒体に、輝度信号を第1のヘッドを用い
て記録再生する手段と色信号を第2のヘッドを用いて記
録再生する手段とを有し、輝度信号の記録を円盤状記録
媒体の第1の領域に、色信号の記録を第1の領域より内
周にある第2の領域にそれぞれ行なうように構成した映
像信号記録再生装置。 2、色信号は2つの信号に分離され、第2のヘッドは前
記2つの信号を時間軸ff縮して多重にした信号を記録
することを特徴とする特許請求の範囲第1項記載の映像
信号記録再生装置。
[Scope of Claims] 1. A disk-shaped recording medium includes means for recording and reproducing a luminance signal using a first head and means for recording and reproducing a color signal using a second head, A video signal recording/reproducing device configured to record a color signal in a first area of a disc-shaped recording medium and to record a color signal in a second area located on the inner periphery of the first area. 2. An image according to claim 1, characterized in that the color signal is separated into two signals, and the second head records a signal obtained by compressing the two signals on the time axis ff and multiplexing them. Signal recording and reproducing device.
JP58212819A 1983-11-11 1983-11-11 Video signal recording and reproducing device Pending JPS60105394A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP58212819A JPS60105394A (en) 1983-11-11 1983-11-11 Video signal recording and reproducing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP58212819A JPS60105394A (en) 1983-11-11 1983-11-11 Video signal recording and reproducing device

Publications (1)

Publication Number Publication Date
JPS60105394A true JPS60105394A (en) 1985-06-10

Family

ID=16628878

Family Applications (1)

Application Number Title Priority Date Filing Date
JP58212819A Pending JPS60105394A (en) 1983-11-11 1983-11-11 Video signal recording and reproducing device

Country Status (1)

Country Link
JP (1) JPS60105394A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62181590A (en) * 1986-02-05 1987-08-08 Matsushita Electric Ind Co Ltd Magnetic recording and reproducing device
JPH03185631A (en) * 1989-12-14 1991-08-13 Matsushita Electric Ind Co Ltd Optical disk and optical disk reproducing device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62181590A (en) * 1986-02-05 1987-08-08 Matsushita Electric Ind Co Ltd Magnetic recording and reproducing device
JPH03185631A (en) * 1989-12-14 1991-08-13 Matsushita Electric Ind Co Ltd Optical disk and optical disk reproducing device

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