JPH02146151A - Information signal recorder - Google Patents

Information signal recorder

Info

Publication number
JPH02146151A
JPH02146151A JP63300085A JP30008588A JPH02146151A JP H02146151 A JPH02146151 A JP H02146151A JP 63300085 A JP63300085 A JP 63300085A JP 30008588 A JP30008588 A JP 30008588A JP H02146151 A JPH02146151 A JP H02146151A
Authority
JP
Japan
Prior art keywords
frequency
signal
information signal
disk
carrier wave
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
JP63300085A
Other languages
Japanese (ja)
Inventor
Koji Yamazaki
浩司 山崎
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.)
Victor Company of Japan Ltd
Original Assignee
Victor Company of Japan 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 Victor Company of Japan Ltd filed Critical Victor Company of Japan Ltd
Priority to JP63300085A priority Critical patent/JPH02146151A/en
Publication of JPH02146151A publication Critical patent/JPH02146151A/en
Pending legal-status Critical Current

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  • Television Signal Processing For Recording (AREA)

Abstract

PURPOSE:To reduce an effect owing to secondary harmonics and to expand a video signal band by recording a frequency of a carrier wave signal contained in an information signal to be recorded in corresponding to a radius of an information signal recording medium disk in ascending order of frequency from the inner circumferential side to the outer circumferential side. CONSTITUTION:A chrominance signal inputted from a terminal 1 is controlled by a voltage control amplifier 4 to hold its frequency deviation at a constant value, and is FM-modulated 5 to be outputted from a terminal 6. Then, a vertical synchronizing signal is separated from a video signal by a synchronization separating circuit 7 to be supplied to a V-pulse counter 8. A signal is sent to a PLL frequency synthesizer 9 by the counter 8 when the vertical synchronizing signal is inputted a fixed number of times, and a decreasing operation on a set value by one is performed from the outermost circumference to the innermost circumference of the disk the prescribed times, and an oscillating frequency is lowered by an oscillating frequency of a reference quartz oscillator 10 at constant intervals. Thus, by lowering gradually the carrier wave frequency without changing the frequency deviation from the outermost circumference to the innermost circumference of the disk, the carrier frequency in an outer circumferential part is raised, and deterioration of picture quality can be limited to a minimum.

Description

【発明の詳細な説明】 (産業上の利用分野) 本発明は、ビデオディスク等の情報信号記録媒体円盤に
角速度一定で信号を記録する情報信号記録装置に関する
ものである。
DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an information signal recording device that records signals at a constant angular velocity on an information signal recording medium disk such as a video disk.

(従来の技術) 一般に、ビデオディスク等に記録される信号の記録再生
周波数は、ディスクに形成される情報信号ビットのビッ
ト長に対応しているため、そのビット長によって制限さ
れる。
(Prior Art) Generally, the recording/reproducing frequency of a signal recorded on a video disc or the like corresponds to the bit length of information signal bits formed on the disc, and is therefore limited by the bit length.

このため、映像信号をFM変調して角速度一定(CAV
)でディスクに記録しようとする場合には、そのディス
クの信号記録部の最内周部に形成するビットで記録再生
することを基準にして、そのビット長から記録する信号
の搬送波周波数や周波数偏移、そして映像信号の帯域等
を決定している。
For this reason, the video signal is FM modulated to provide constant angular velocity (CAV).
), the carrier wave frequency and frequency deviation of the signal to be recorded are calculated based on the bit length, based on the bits formed at the innermost circumference of the signal recording area of the disk. It also determines the video signal bandwidth, etc.

しかし、特願昭61−239823号及び特願昭61−
280293号等で開示されているように映像信号の帯
域を広げて記録しようとする場合、映像信号の帯域に比
べて搬送波周波数が低くなるので、再生時に伝送系の歪
みによって生じる二次高調波成分がFM信号帯域内に混
入する量が著しく増大し、再生画像を劣化させるという
問題が生じてしまう。
However, Japanese Patent Application No. 61-239823 and Japanese Patent Application No. 61-239823
When trying to widen the video signal band and record it as disclosed in No. 280293, etc., the carrier frequency becomes lower than the video signal band, so second harmonic components caused by distortion in the transmission system are generated during playback. A problem arises in that the amount of interference mixed into the FM signal band increases significantly, degrading the reproduced image.

そこで、映gA信号の帯域を広げて記録する際に通常の
帯域の映像信号が記録されたディスクを再生するための
再生装置でも再生可能な程度に搬送波周波数を上げて記
録することにより、再生時の二次高調波成分の影響を低
減しようとするものがある。
Therefore, when recording by widening the video gA signal band, the carrier wave frequency is increased to the extent that it can be played back even by a playback device that plays back a disc on which a normal band video signal is recorded. There are methods that attempt to reduce the influence of the second harmonic component.

しかし、この場合ピット長が長くなり、最内周部に通常
のディスクと同数のビットを形成することが出来ないの
で、記録時間が短縮してしまうという欠点があった。
However, in this case, the pit length becomes long and the same number of bits cannot be formed on the innermost circumference as in a normal disk, so there is a drawback that the recording time is shortened.

(発明が解決しようとする課題) 上述のように、従来の角速度一定で記録されたビデオデ
ィスク等の情報信号記録媒体円盤において、映像信号の
帯域を広げて記録すると、二次高調波成分の混入による
再生画像劣化が著しく、それを解決するために搬送波周
波数を上げると記録時間が短くなるという課題があった
(Problems to be Solved by the Invention) As described above, when recording a video signal with a wider band on an information signal recording medium disc such as a conventional video disc recorded at a constant angular velocity, second harmonic components are mixed in. There was a problem in that the reproduced image deteriorated significantly due to this problem, and if the carrier frequency was increased to solve this problem, the recording time would be shortened.

そこで本発明は、角速度一定で情報信号記録媒体円盤に
信号記録する際に、その記録位置に応じて搬送波周波数
を変化させることにより、映像信号の帯域を広げても再
生時間及び再生画像を損なうことなく再生できる情報信
号記録媒体円盤に記録する情報信号記録装置を提供する
ことを目的とする。
Therefore, the present invention has been proposed to change the carrier wave frequency according to the recording position when recording a signal on an information signal recording medium disc at a constant angular velocity, so that even if the band of the video signal is widened, the playback time and the playback image are not impaired. An object of the present invention is to provide an information signal recording device that records information on an information signal recording medium disc that can be reproduced without any trouble.

(課題を解決するための手段) 上記目的を達成するための手段として、情報信号記録媒
体円盤に角速度一定で情報信号をFM変調して記録する
情報信号記録装置であって、搬送波信号の周波数を前記
情報信号記録媒体円盤の径に対応させて内周側より外周
側の方を上げて記録するようにしたことを特徴とする情
報信号記録装置を提供しようとするものである。
(Means for Solving the Problems) As a means for achieving the above object, there is provided an information signal recording device that records an information signal by FM modulating it at a constant angular velocity on an information signal recording medium disk, the device comprising: It is an object of the present invention to provide an information signal recording device characterized in that recording is performed with the outer circumferential side raised higher than the inner circumferential side in accordance with the diameter of the information signal recording medium disc.

(実施例) 本発明の情報信号記録装置を静電容量方式のビデオディ
スクに用いた一実施例を図面と共に説明する。
(Embodiment) An embodiment in which the information signal recording device of the present invention is used in a capacitive video disc will be described with reference to the drawings.

まず、色信号を2.56MIIZに低域変換された映像
信号が端子1よりクランプ回路2及び同期分離回路7に
供給される。
First, a video signal obtained by low frequency converting the color signal to 2.56MIIZ is supplied from the terminal 1 to the clamp circuit 2 and the sync separation circuit 7.

そして、クランプ回路2は、同期分離回路7より供給さ
れるクランプパルスにより、映像信号の直流成分を一定
に保持して、プリエンファシス回路3で高域強調をした
後、電圧制御増幅器4に供給され、周波数偏移Δfを一
定値に保持するように直流電圧及び振幅レベルを制御し
て、FM変調器5によりFM信号に変換されて、端子6
より出力される。
Then, the clamp circuit 2 holds the DC component of the video signal constant using the clamp pulse supplied from the sync separation circuit 7, and after emphasizing the high frequency range in the pre-emphasis circuit 3, the DC component is supplied to the voltage control amplifier 4. , the DC voltage and the amplitude level are controlled so as to maintain the frequency deviation Δf at a constant value, and the signal is converted into an FM signal by the FM modulator 5 and sent to the terminal 6.
It is output from

なお、このFM変調器5より出力されるFM信号のペデ
スタルに相当する周波数をfpとする。
Note that the frequency corresponding to the pedestal of the FM signal output from this FM modulator 5 is designated as fp.

また、同期分離回路7は、供給される映像信号からクラ
ンプパルスを取出しクランプ回路2に出力する一方、水
平同期信号を分離して172分周器23とモノマルチ2
4に供給し、垂直同期信号も分離してVパルスカウンタ
(垂直同期パルスカウンタ)8に供給している。
Further, the synchronization separation circuit 7 extracts a clamp pulse from the supplied video signal and outputs it to the clamp circuit 2, while separating the horizontal synchronization signal and transmitting it to the 172 frequency divider 23 and the monomulti 2
4, and the vertical synchronization signal is also separated and supplied to a V pulse counter (vertical synchronization pulse counter) 8.

そして、このVパルスカウンタ8は、同期分離回路7よ
り供給される垂直同期信号が一定回数入力されるとPL
L周波数シンセサイザ9に信号を送出し、その設定値を
1繰下げる。
When the vertical synchronization signal supplied from the synchronization separation circuit 7 is input a certain number of times, the V pulse counter 8
A signal is sent to the L frequency synthesizer 9, and its set value is decreased by one.

以上の操作はディスク最外周より最内周にかけてM回行
なわれ、PLL周波数シンセサイザ9の初期設定値をN
とすると、このPLL周波数シンセサイザ9の発振周波
数fqは基準水晶発振器10の発振周波数f「に対して
最外周にてNfr、最内周にて(N−M)frと一定時
間ごとに基準水晶発振器10の発振周波数frづつ周波
数が低下する。
The above operation is performed M times from the outermost circumference to the innermost circumference of the disk, and the initial setting value of the PLL frequency synthesizer 9 is changed to N.
Then, the oscillation frequency fq of the PLL frequency synthesizer 9 is changed to the oscillation frequency f of the reference crystal oscillator 10 by Nfr at the outermost circumference and (NM)fr at the innermost circumference at regular intervals. The frequency decreases by 10 oscillation frequencies fr.

また、FM変調器5より出力されるFM信号は端子6よ
り出力される一方、増幅器11を経てPLL周波数シン
セサイザ9の出力fqと共にスイッチ12に入力され、
IH(1水平走査期間)毎に交互に選択されてリミッタ
13゛、FM復調器14、ローパスフィルタ(LPF)
15、デイエンファシス回路16とで構成される復調回
路25に入力される。
Further, the FM signal output from the FM modulator 5 is output from the terminal 6, and is also input to the switch 12 together with the output fq of the PLL frequency synthesizer 9 via the amplifier 11.
A limiter 13', an FM demodulator 14, and a low-pass filter (LPF) are selected alternately every IH (one horizontal scanning period).
15 and a de-emphasis circuit 16.

そして、この復調回路25により復調された信号はコン
デンサCI + C2、スイッチ17.19及びAFC
検出回路(自動周波数制御検出回路)18に供給されて
搬送波周波数が検出される。
The signal demodulated by this demodulation circuit 25 is sent to the capacitor CI + C2, the switch 17.19 and the AFC
The signal is supplied to a detection circuit (automatic frequency control detection circuit) 18 and the carrier wave frequency is detected.

ここで、スイッチ17とスイッチ19には同期分離回路
7より水平同期信号が供給されるモノマルチバイブレー
タ24より出力されるパーストゲートパルスは、IHス
イッチ17側に入力した後、IHスイッチ19側に入力
するというようにIH毎に交互に入力される。
Here, the burst gate pulse output from the mono multivibrator 24 to which the horizontal synchronization signal is supplied from the synchronization separation circuit 7 to the switch 17 and the switch 19 is input to the IH switch 17 side and then input to the IH switch 19 side. This is input alternately for each IH.

つまり、スイッチ12にてFM変調器5より出力される
FM信号が選択されている間のバースト期間にはスイッ
チ17が閉じ、スイッチ12がPLL周波数シンセサイ
ザ9の出力信号を選択している間のバースト期間にはス
イッチ19が閉じる。
That is, during the burst period while the switch 12 selects the FM signal output from the FM modulator 5, the switch 17 is closed, and during the burst period when the switch 12 selects the output signal of the PLL frequency synthesizer 9, the switch 17 closes. During the period, switch 19 is closed.

この操作によって前述のFM信号の発振周波数fpとP
LL周波数シンセサイザ9の発振周波数fQとの周波数
差が検出され、AFC検出回路18の出力がFM変調器
5に供給され、このFM変調器5の発振周波数fpをf
p= fqとなるように制御する。
By this operation, the oscillation frequency fp and P of the FM signal mentioned above are
The frequency difference with the oscillation frequency fQ of the LL frequency synthesizer 9 is detected, and the output of the AFC detection circuit 18 is supplied to the FM modulator 5, and the oscillation frequency fp of the FM modulator 5 is
Control is performed so that p=fq.

一方、復調回路25によりFM復調された信号は、クラ
ンプ回路20に供給されてペデスタルクランプされ、ス
イッチ21によりスイッチ12がFM変調器5より出力
されるFM信号を選択する間のみ周波数偏移検出回路2
2に接続されて供給される。
On the other hand, the signal FM demodulated by the demodulation circuit 25 is supplied to the clamp circuit 20 and pedestally clamped, and the frequency shift detection circuit is operated by the switch 21 only while the switch 12 selects the FM signal output from the FM modulator 5. 2
2 and is supplied.

そして、この周波数偏移検出回路22では、クランプ回
路20よりIH間隔で供給される同期信号の振幅レベル
より周波数偏移Δfが検出され、電圧制御増幅器4の出
力における直流電圧オフセット及び振幅レベルを制御し
て、周波数偏移Δfを一定値に維持する。
The frequency deviation detection circuit 22 detects the frequency deviation Δf from the amplitude level of the synchronization signal supplied from the clamp circuit 20 at IH intervals, and controls the DC voltage offset and amplitude level at the output of the voltage control amplifier 4. to maintain the frequency deviation Δf at a constant value.

以上、説明した本実施例のビデオディスク記録装置は、
第2図(A>及び(B)に示すように、角速度一定のビ
デオディスクを記録する際に最外周から最内周にかけて
周波数偏移Δfを変えずに搬送波周波数fpをNfrか
ら(N−M)frまでM四段階的に下げることで、外周
部における搬送波周波数を上げ、画質の低下を最少限に
することができる。
The video disc recording device of this embodiment described above is as follows:
As shown in Fig. 2 (A> and (B)), when recording a video disc with a constant angular velocity, the carrier wave frequency fp is changed from Nfr to (N-M ) fr in four steps, it is possible to increase the carrier wave frequency at the outer periphery and minimize the deterioration in image quality.

また、搬送波周波数fpの切換えは垂直帰線期間中に行
うようにしたので切換え時の変化は画面上に現れない。
Furthermore, since the carrier frequency fp is switched during the vertical retrace period, the change at the time of switching does not appear on the screen.

また、再生時のFM復調出力に切換前後で直流電圧レベ
ル差を生じるが、周波数を下げる回数MとPLL周波数
シンセサイザ9の初期設定値Nを大きくし、基準水晶発
振器10の発振周波数f「を小さくすることによりその
直流電圧レベル差は小さくなり、交流電圧結合段が再生
側にあれば、その影響は、無視できるほどになる。
Also, although a DC voltage level difference occurs before and after switching in the FM demodulation output during playback, the number of times the frequency is lowered M and the initial setting value N of the PLL frequency synthesizer 9 are increased, and the oscillation frequency f of the reference crystal oscillator 10 is decreased. As a result, the DC voltage level difference becomes small, and if the AC voltage coupling stage is on the reproduction side, its influence becomes negligible.

(発明の効果) 本発明の情報信号記録装置は記録する情報信号に含まれ
る搬送波信号の周波数を情報信号記録媒体円盤の径に対
応させて内周側より外周側の方を上げて記録するように
したので、二次高調波による影響を低減し、外周部での
映像信号帯域を広げることができる。
(Effects of the Invention) The information signal recording device of the present invention records the frequency of the carrier wave signal included in the information signal to be recorded so that the frequency of the carrier wave signal included in the information signal is made higher on the outer circumference side than on the inner circumference side in accordance with the diameter of the information signal recording medium disk. Therefore, it is possible to reduce the influence of second harmonics and widen the video signal band at the outer periphery.

またこのことにより、画質も改善されるという効果があ
る。
This also has the effect of improving image quality.

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

第1図は本発明の情報信号記録装置の一実施例を示すブ
ロック図、第2図(A>及び(B)は本実施例で記録し
た静電容量方式ビデオディスクの最内周部及び最外周部
における周波数スペクトル図である。 2.20・・・クランプ回路、 3・・・プリエンファシス回路、4・・・電圧制御増幅
器、5・・・FM変調器、7・・・同期分離回路、8・
・・Vパルスカウンタ、9・・・PLLシンセサイザ、
10・・・基準水晶発振器、11・・・増幅器、12.
17,19.21・・・スイッチ、13・・・リミッタ
、14・・・FM復調器、15・・・ローパスフィルタ
(LPF)、16・・・デイエンファシス回路、 18・・・AFC検出回路、 22・・・周波数偏移検出回路、23・・・分周器、2
4・・・モノマルチバイブレータ、25・・・復調回路
、c、、c2・・・コンデンサ。 特 許 出願人 日本ビクター株式会社代表者 埋木 
邦夫
FIG. 1 is a block diagram showing an embodiment of the information signal recording device of the present invention, and FIG. It is a frequency spectrum diagram in the outer peripheral part. 2.20... Clamp circuit, 3... Pre-emphasis circuit, 4... Voltage control amplifier, 5... FM modulator, 7... Synchronization separation circuit, 8・
...V pulse counter, 9...PLL synthesizer,
10... Reference crystal oscillator, 11... Amplifier, 12.
17, 19.21... Switch, 13... Limiter, 14... FM demodulator, 15... Low pass filter (LPF), 16... De-emphasis circuit, 18... AFC detection circuit, 22... Frequency shift detection circuit, 23... Frequency divider, 2
4... Mono multivibrator, 25... demodulation circuit, c,, c2... capacitor. Patent Applicant: Japan Victor Co., Ltd. Representative Umiki
Kunio

Claims (1)

【特許請求の範囲】 情報信号記録媒体円盤に角速度一定で情報信号をFM変
調して記録する情報信号記録装置であって、 搬送波信号の周波数を前記情報信号記録媒体円盤の径に
対応させて内周側より外周側の方を上げて記録するよう
にしたことを特徴とする情報信号記録装置。
[Scope of Claims] An information signal recording device for recording an information signal on an information signal recording medium disc by FM modulation at a constant angular velocity, the information signal recording device comprising: a carrier wave signal having a frequency corresponding to a diameter of the information signal recording medium disc; An information signal recording device characterized in that recording is performed with the outer circumferential side raised higher than the circumferential side.
JP63300085A 1988-11-28 1988-11-28 Information signal recorder Pending JPH02146151A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP63300085A JPH02146151A (en) 1988-11-28 1988-11-28 Information signal recorder

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP63300085A JPH02146151A (en) 1988-11-28 1988-11-28 Information signal recorder

Publications (1)

Publication Number Publication Date
JPH02146151A true JPH02146151A (en) 1990-06-05

Family

ID=17880523

Family Applications (1)

Application Number Title Priority Date Filing Date
JP63300085A Pending JPH02146151A (en) 1988-11-28 1988-11-28 Information signal recorder

Country Status (1)

Country Link
JP (1) JPH02146151A (en)

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