JPS58200410A - Reproducer of disk recording medium - Google Patents

Reproducer of disk recording medium

Info

Publication number
JPS58200410A
JPS58200410A JP57085141A JP8514182A JPS58200410A JP S58200410 A JPS58200410 A JP S58200410A JP 57085141 A JP57085141 A JP 57085141A JP 8514182 A JP8514182 A JP 8514182A JP S58200410 A JPS58200410 A JP S58200410A
Authority
JP
Japan
Prior art keywords
signal
recording medium
disc
shaped recording
circuit
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
JP57085141A
Other languages
Japanese (ja)
Inventor
Noboru Okuno
奥野 昇
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 JP57085141A priority Critical patent/JPS58200410A/en
Publication of JPS58200410A publication Critical patent/JPS58200410A/en
Pending legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/24Signal processing not specific to the method of recording or reproducing; Circuits therefor for reducing noise

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Optical Recording Or Reproduction (AREA)
  • Television Signal Processing For Recording (AREA)

Abstract

PURPOSE:To improve the S/N, etc., by detecting automatically the quality of the signal recording state and controlling the characteristics of a signel processing circuit for reproduced picture and sound quality in response to the recorded signal. CONSTITUTION:A detector 14 converts the output signal of a preamplifier circuit 3 into an input signal. This input signal is converted into a DC signal, etc. and then supplied to a video and audio signal processing circuits 16 and 15 respectively. The signal of the detector 14 supplied to the circuit 16 is fed to a video canceller circuit. The cancelling effect is increased as the level of the detecting signal increases, and at the same time the cancelling effect is lowered the detecting signal level reduces. While the signal applied to the circuit 15 is controlled so that the frequency band of the audio output signal is set narrow and wide when the signal level is high and low respectively. As a result, the S/N, etc. is improved.

Description

【発明の詳細な説明】 本発明は円盤状記録媒体(以ドディスクと呼ぶ)にdU
2録された信号を再生する再生装置に関するもので、特
にディスクに記録された信号の記録状態の良否を自動的
に検出し、また、この検出信号に応じて再生画質及び再
生音質に関係する信号処理回路の特性を制御することに
より、常にS/N劣化の少ない再生信号を出力する装置
を提供することを目的とする。ディスク再生装置として
ここでは溝なし静電容量方式ビデオディスク(以下溝な
し方式と呼ぶ)再生装置を例にとって説明する。
DETAILED DESCRIPTION OF THE INVENTION The present invention provides a disk-shaped recording medium (hereinafter referred to as a disk) with dU
2 This relates to a playback device that plays back recorded signals, and in particular automatically detects whether the recording state of the signal recorded on a disc is good or bad, and also detects signals related to playback image quality and playback sound quality according to this detection signal. It is an object of the present invention to provide a device that always outputs a reproduced signal with little S/N deterioration by controlling the characteristics of a processing circuit. A non-grooved capacitive video disc (hereinafter referred to as non-grooved) video disc reproducing apparatus will be described as an example of a disc reproducing apparatus.

溝なし方式に於いては、ディスクに記録される信号は第
1図のスペクトラムダイヤグラムに示される様に、輝度
信号Yは周波数帯域が約3.1MHzに制限されると同
時に、搬送りロマ信号Cはそのキャリア周波数が約2.
6MHzとなる様に低域に変換され、輝度信号Yに周波
数インターリーブの形で重畳されている。一方、2チヤ
ンネルのオーディオ信号A4.A2はキャリア周波数を
約s、43MHz及び約3.73Mk(zとするFM信
号の形で前記輝度信号に混合されている0前艷輝度信号
、クロマ信づおよびオーディオ信号の混合信号はさらに
FM信号の形に変換され、信号再生時、ピックアップの
トラッキング制御のために必要となるip、。
In the grooveless system, the signals recorded on the disc are limited to the frequency band of the luminance signal Y to approximately 3.1 MHz, and at the same time, the frequency band of the luminance signal Y is limited to approximately 3.1 MHz, and the carrier ROMA signal C is has a carrier frequency of about 2.
The frequency is converted to a low frequency of 6 MHz, and is superimposed on the luminance signal Y in a frequency interleaved manner. On the other hand, the 2-channel audio signal A4. A2 is a mixed signal of a luminance signal, a chroma signal and an audio signal mixed with the luminance signal in the form of an FM signal with a carrier frequency of about s, 43MHz and about 3.73Mk (z). IP, which is converted into the form of IP and is required for pickup tracking control during signal playback.

アイスフ/ステムと同様にレーザを用いて光学的にピッ
ト形状の形でディスクに記録される。この:植のディス
クに記録される信号のスペクトラムダイヤグラムを第2
図に示す。この様にディスクに記録された信号の形状は
マスタリング工程やプレス1程等を経ることにより多少
の歪を伴なうが、その信号形状の歪の度合は前記ディス
クの製造工程の差により実際にはディスク毎にかなりの
バラツキが生じている。また同一ディスクに於いてもデ
ィスクの外周部に比べて信号の記録密度が高くなるディ
スク内周部の方がこの信号形状の歪が増大する傾向があ
る。この様な信号形状の歪が大きいディスクを再生した
場合、第2図で破線で示さ7[る様に、FM信号のスペ
クトラムの中にこのFM j4 ”r4の変調信号であ
るビデオ信号成分及びオーディオ信号成分が発生し、こ
れらの信号成分はディスクに記録された信号形状の歪の
大小に応じて変化し、歪が大きい場合は大きく、また歪
が小さい場合は小さく発生する。さらにビックアンプが
ディスクに接触して18号を再生する接触方式に於いて
はディスクとピックアップの共働作用によっても前記変
調信号成分の発生度合が影響されることも実験的に確認
されている。またディスクに記録された信号形状の歪が
大きい場合、すなわち再生時変調信号であるビデオ信号
成分及びオーディオ信号成分が大きく発生している場合
には再生画及び再生音のS/Nが悪い、あるいは反転現
象が生じやすいといった傾向がある。本発明はこの点に
着目して再生FM信号中の変調信号成分のレベルを検出
することにより自動的に反転現象の防止あるいは再生画
、再生音のS/N等の改善を行なうことを目的とする。
Like the IceF/Stem, it is optically recorded on the disk in the form of pits using a laser. The spectrum diagram of the signal recorded on this disc is shown in the second diagram.
As shown in the figure. As described above, the shape of the signal recorded on the disc is subject to some distortion due to the mastering process, first press, etc., but the degree of distortion of the signal shape is actually due to differences in the manufacturing process of the disc. There is considerable variation between discs. Furthermore, even on the same disk, the distortion of the signal shape tends to increase at the inner circumference of the disk where the recording density of signals is higher than at the outer circumference of the disk. When playing back a disc with such a large distortion in the signal shape, as shown by the broken line in Figure 2, the video signal component and the audio component, which is the modulation signal of FM j4''r4, are present in the spectrum of the FM signal. Signal components are generated, and these signal components change depending on the magnitude of distortion in the signal shape recorded on the disk.When the distortion is large, the signal components are generated, and when the distortion is small, the signal components are generated. It has been experimentally confirmed that in the contact method in which No. 18 is reproduced by contacting the disc, the degree of generation of the modulated signal component is also influenced by the cooperative action of the disc and the pickup. When the distortion of the signal shape is large, that is, when the video signal component and audio signal component, which are modulated signals during playback, are large, the S/N ratio of the played image and sound is poor, or an inversion phenomenon tends to occur. The present invention focuses on this point and detects the level of the modulated signal component in the reproduced FM signal to automatically prevent the reversal phenomenon or improve the S/N of the reproduced image and reproduced sound. The purpose is to do something.

第3図は溝なし方式のプレーヤの従来の信号処理回路の
概略を示すブロック図であるが、この図を用いて従来の
回路動作を簡単に説明する。ディスク1に記録された信
号は静電容量方式の原理にもとすきピックアップ手段2
に於いてピックアップされる。この信号ピックアップ手
段2の出力信号は第2図に示される信号スペクトラムを
有する。
FIG. 3 is a block diagram schematically showing a conventional signal processing circuit for a grooveless type player, and the operation of the conventional circuit will be briefly explained using this diagram. The signal recorded on the disk 1 is picked up by the pickup means 2 based on the principle of capacitance.
It will be picked up at. The output signal of this signal pickup means 2 has a signal spectrum shown in FIG.

信号ピックアップ手段2の出力信号はプリアンプ回路3
に人力され、ここで増巾された後イコライザーアンプ回
路4に送られる。イコライザーアンプ回路4に於てはデ
ィスクを含めた信号伝送系の周波数特性の補IF、ある
いはFM検波をするため1・ζは不必゛皮な帯域の信号
の除去、さらにはディスクの再生位置による周波数特性
の補正等を行なう。
The output signal of the signal pickup means 2 is sent to the preamplifier circuit 3.
The signal is input manually, amplified here, and then sent to the equalizer amplifier circuit 4. In the equalizer amplifier circuit 4, 1 and ζ are used to compensate for the frequency characteristics of the signal transmission system including the disk, or to perform FM detection, so 1. Correct characteristics, etc.

イコライザーアンプ回路4の出力信号はFM検波2t6
に入力され、ここで周波数復調を行ない第1図に示され
る信号スペクトルを有する信号を再生する。FM検波器
6の出力信号はオーディオ信号処理回路6及びビデオ信
号処理回路7にそれぞれ人力される。オーディオ信号処
理回路に於てはビデオ46号成分を除去し、2つのチャ
ネルのオーディオ信号をFM検波し、ノイズリダクショ
ン、再生モードに応じた切換え等の処理をした後オーデ
ィオ出力端子8,9及びRF変調器1oに出力さj+る
。−hビデオ信号処理回路7に入力された信号はテレビ
ジョン受像機で再生できる信号形式への変換、あるいは
ビデオノイズキャンセラー等の処理を受けた後、ビデオ
出力端子11及びRF変調器1oに出力される。RF変
調器10に於いては入力されたビデオ及びオーディオ信
号をテレビジョン受1象機のアンテナ端子から入力して
再生可能な信号形式に変換した後RF出力端子12に出
力する。一方プリアンプ3より出力され市1j#信号処
哩回路13に人力されたトラッキング制御のために必要
な3種類の信号はそれぞれ抽出分離及び処理された後、
信号ピックアップ手段2に入力され、ここでピックアッ
プが信号トラックを正しくトレース出来る様にするため
のトラ、キング制御信号として利用される。
The output signal of the equalizer amplifier circuit 4 is FM detection 2t6
Here, frequency demodulation is performed to reproduce a signal having the signal spectrum shown in FIG. The output signal of the FM detector 6 is input to an audio signal processing circuit 6 and a video signal processing circuit 7, respectively. The audio signal processing circuit removes the video No. 46 component, performs FM detection on the audio signals of the two channels, performs processing such as noise reduction and switching according to the playback mode, and then outputs the audio output terminals 8, 9 and RF. It is output to the modulator 1o. -h The signal input to the video signal processing circuit 7 is converted into a signal format that can be played on a television receiver, or processed by a video noise canceller, etc., and then output to the video output terminal 11 and the RF modulator 1o. Ru. In the RF modulator 10, the input video and audio signals are inputted from the antenna terminal of the television receiver, converted into a reproducible signal format, and then outputted to the RF output terminal 12. On the other hand, the three types of signals necessary for tracking control outputted from the preamplifier 3 and input manually to the signal processing circuit 13 are extracted, separated, and processed, respectively.
The signal is input to the signal pickup means 2, where it is used as a tracking control signal to enable the pickup to trace the signal track correctly.

第4図は本発明にもとすくディスク再生装置の信号処理
回路の一実施例を示すブロック図であり、以下第4図を
用いて説明するが第3図と同一機能のブロックについて
は同−首号を付し説明は省略する。プリアンプ回路3の
出1カ信号を入力信号と11 する検出器14を設け、ここでFM信号中に含まれるF
M信号の変調信号成分を検出して後続する回路の特性を
制御するに適した信号形式、例えば直流信号に変換した
後、ビデオ信号処理回路16及びオーディオ信号処理回
路16に入力する。変調1,7弓++15分の検出方法
としてはFM信号の側帯波成分と14別して抽出1’J
J能な部分が有効であり、′ま/こスペクトラムが比較
的集中している搬送波信号。
FIG. 4 is a block diagram showing an embodiment of a signal processing circuit of a disc playback device according to the present invention.The following explanation will be made using FIG. 4, but blocks having the same functions as those in FIG. A number will be given and the explanation will be omitted. A detector 14 is provided which takes the output signal of the preamplifier circuit 3 as an input signal, and detects the FM signal included in the FM signal.
The modulated signal component of the M signal is detected and converted into a signal format suitable for controlling the characteristics of subsequent circuits, such as a DC signal, and then input to the video signal processing circuit 16 and the audio signal processing circuit 16. The detection method for modulation 1, 7 bows + 15 minutes is to extract 1'J separately from the sideband components of the FM signal.
A carrier signal in which the active part is effective and the spectrum is relatively concentrated.

同えば搬送りロマ信号あるい/i、搬送オーディオ信H
j(オーティオFM信号)を選択的に検出する方法が有
効である。ビデオ信号処理回路16に入力さ7また検出
器14からの信号はビデオ信号処理回路16中のビデオ
ノイズキャンセラー回路に入力され、ここで変調信号成
分の検出信号レベルが高くなるe(つれてビデオノイズ
キャンセラー回路のキャンセル効果を尚める様に、また
前記検出信号レベルが低くなるにつれて前記ビデオノイ
ズキャンセラー回路のキャンセル効果を低くする様に制
rII4I4−る。ビデオノイズキャンセラー回路は周
知のごとくキャンセル効果を高くするとS/Nの改善幼
果it増大するが同時に再生画の細部成分の欠落も増大
する。逆にキャンセル効果を低くすると再生画の細部成
分の欠落は減少するが同時にS/Nの改善効果も減少す
る。しかし一般使用者にとってはS/Nの劣化が最も気
になりかつ目立つ項目であるのでS/N劣化が発生する
場合に細部信号成分の欠落をある程度犠牲にしてもS/
Nを自動的に改善することは非常に有効である。一方オ
ーディオ信号処理回路15に入力した検出器14からの
信号は前、iピ検出1ど号レベルに応じて例えば公知の
技術を用いてオーディオ出力信号の周波数帯域を前記検
出信号レベルが高い場合には狭く、また前記検出信号レ
ベルが低い場合には広くなる様に市1j御する。こうす
ることによりディスクからの再生信号のS/Nが悪い状
態の時にはディスク再生装]dから出力される信号の周
波数帯域は狭く抑えられるという欠点は生じるが、シj
1シ一般使用者にとって最も耳ぎわりなS/Nの改善効
果が期待できるため非常に有効な手段となる。
Same as carrier ROMA signal/i, carrier audio signal H
A method of selectively detecting j (audio FM signal) is effective. The signal from the detector 14 is input to the video signal processing circuit 16, and the signal from the detector 14 is input to the video noise canceller circuit in the video signal processing circuit 16, where the detected signal level of the modulated signal component becomes high (e) The video noise canceller circuit is controlled so as to improve the canceling effect of the canceller circuit, and to reduce the canceling effect of the video noise canceller circuit as the detection signal level becomes lower.As is well known, the video noise canceler circuit improves the canceling effect. If it is set higher, the S/N will improve, but at the same time the loss of detailed components in the reproduced image will also increase.On the other hand, if the cancellation effect is lowered, the loss of detailed components in the reproduced image will decrease, but at the same time the S/N will be improved. However, for general users, S/N deterioration is the most noticeable and noticeable item, so if S/N deterioration occurs, S/N may be reduced even if the loss of detailed signal components is sacrificed to some extent.
Automatically improving N is very effective. On the other hand, the signal from the detector 14 that is input to the audio signal processing circuit 15 is inputted to the audio signal processing circuit 15, and the frequency band of the audio output signal is changed using, for example, a known technique according to the i-pi detection signal level when the detected signal level is high. The area 1j is controlled so that it is narrow, and becomes wider when the detection signal level is low. By doing this, when the S/N of the reproduction signal from the disc is poor, the frequency band of the signal output from the disc playback device]d is suppressed to a narrow frequency band, but the
This is a very effective means because it can be expected to improve the S/N ratio, which is most noticeable to general users.

以上の犬/Ai I+!lにおいては検出器14からの
信号によりビデオ及びオーディオ信号処理回路の特性を
lll1l 崗1する方法をボしたが、検出器14から
の信号によりイコライザーアンプ回路のイコライザー特
ftIf1:F M信号のデビエイ7ヨン範囲の周波数
附近をブーストン1lII帯波成分を相対的に低下せし
める1遍に制御することにより反転現象の防1Fかり能
であり、同時にビデオ信号のS/N改善効果については
前記実施例と同様の効果を得ることができる0前記FM
信号中の変調信号成分はまたディスクの外周部に比べ内
周部で増大する傾向があることよりディスクの外周部と
内周部での記録密度の差によ1.で生じるディスク内周
部での高周波数領域のレベルの低下を補正する、いわゆ
るラジアルコンベンセイタ−の制御信号として前dピ変
調信号成分の検出信号レベルを利用することは有効であ
る。
More dogs/Ai I+! In 1, we have discussed the method of determining the characteristics of the video and audio signal processing circuits using the signal from the detector 14, but the equalizer characteristics of the equalizer amplifier circuit are determined using the signal from the detector 14. The inversion phenomenon can be prevented by controlling the vicinity of the frequency in the Yon range in a single manner to relatively reduce the booston 1lII band component, and at the same time, the effect of improving the S/N of the video signal is the same as in the previous embodiment. 0 said FM that can obtain the effect of
The modulated signal component in the signal also tends to increase at the inner periphery of the disk compared to the outer periphery of the disk. It is effective to use the detected signal level of the front d-pi modulation signal component as a control signal for a so-called radial convencator, which corrects the drop in level in the high frequency region at the inner periphery of the disk.

+jiJ記大施例大砲また検出器14への入力信号とし
てノリアンプ回路3の出力信号を用いたが、検出dK1
40そう人位置はFM検波器以前の任意の位置にそう大
可能であることは明らかである。また+兄明の大砲yl
Jはビデオディスクシステムの一方式である(作なし方
式を例にとって説明したがフィリップス/MCAが開発
したVLP方式、あるいは)IOAが開発し′fCcE
D方式さらには他の円盤状記録媒体から信号を再生する
装置に適用して有効であることは明らかである。また以
上の説明に於いては再生装置に於ける反転現象の防止及
びS/Hの改善を自動的に行なう手段について述べたが
、前記変調信号成分の検出レベルによりディスクの良否
の判定を行なうこともOr能であることは明らかである
+jiJ Large Example Cannon Also, the output signal of the Noriamp circuit 3 was used as the input signal to the detector 14, but the detection dK1
It is clear that more than 40 positions are possible at any position before the FM detector. Also + brother Akira's cannon yl
J is a type of video disc system (the VLP method developed by Philips/MCA, although the explanation was given using the non-production method as an example), or the 'fCcE method developed by IOA.
It is clear that the present invention is effective when applied to devices that reproduce signals from the D method and other disk-shaped recording media. Furthermore, in the above explanation, the means for automatically preventing the reversal phenomenon and improving the S/H in the playback device has been described, but it is also possible to judge the quality of the disc based on the detection level of the modulation signal component. It is clear that Or is also capable.

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

第1図は静電d歇溝なし方式ビデオディスクシステムに
於けるビデオ信号及びオーディオ信号のスペクトラムダ
イヤグラム、第2図は同方式のディスクに記録される信
号スペクトラムダイヤグラム、第3図は同方式のプレー
ヤの従来の信号処理回路の概略を示すブロック図、第4
図は本発明にもとず〈ディスク再生装置の信号処理回路
の一実施例を示すブロック図である。 ′7 1°°°°°゛円盤状記録媒体、2°°°°°°ピック
アップ手段、3 ””プリアンプ、4°°°°°°イコ
ライザーアンプ、6°−−−−−FM検波器、14°°
°°°°検出器、16°°°°°゛オ一デイオ信号処理
回路、16゜・・・−ビデオ信号処理回路。 代理人の氏名 弁理士 中 尾 敏 男 ほか1名第1
図 1 凶
Figure 1 is a spectrum diagram of video and audio signals in an electrostatic d-disc grooveless video disc system, Figure 2 is a signal spectrum diagram recorded on a disc using the same system, and Figure 3 is a player using the same system. A block diagram schematically showing a conventional signal processing circuit of
The figure is a block diagram showing an embodiment of a signal processing circuit of a disc playback device based on the present invention. '7 1°°°°°゛disc-shaped recording medium, 2°°°°°°pickup means, 3'' preamplifier, 4°°°°°° equalizer amplifier, 6°---FM detector, 14°°
°°°°detector, 16°°°°°゛ video signal processing circuit, 16°...-video signal processing circuit. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 1 Evil

Claims (1)

【特許請求の範囲】 (1)円盤状記録媒体から周波数変調信号の形で記録さ
れたテレビジョンの映像信号及びオーディオ信号を再生
する再生手段と、その再生手段からの再生周波数変調信
号中に含まれる変調信号成分を′検出する検出手段と、
その検出手段で検出される検出信号レベルに応じて再生
信号を処理する信号処理回路の特性を自動的に制御する
手段を有することを特徴とする円盤状記録媒体再生装置
0(2)変調信号成分として搬送りロマ信号成分を検出
することを特徴とする特許請求の範囲第1項記載の円盤
状記録媒体再生装置。 (3)変調信号成分として搬送オーディオ信号成分を検
出することを特徴とする特許請求の範囲第1項記載の円
盤状記録媒体再生装置。 (4)検出信号レベルに応じて信号処理回路中の周波数
変調信号伝送回路の周波数特性、ビデオノイズキャンセ
ラー回路のキャンセル効果の度合、ピ\ チオ信号処理回路の周波数特性、オーディオ信号処理回
路の周波数特性の少なくとも1つを制御することを特徴
とする特許請求の範囲第1項記載の円盤状記録媒体再生
装置。 (6)円盤状記録媒体に周波数変調信号の形で記録され
たテレビジョンの映像信号及びオーディオ信号を再生す
る手段と、その再生周波数変調信号中に含ま7′する変
調1ご号成分を検出する検出手段と、その検出り段で検
出される検出信号レベルとあらかじめ定められた基準信
号レベルとを比較する比1咬り段と、その比較手段にお
いて基準レベルをオーバーしたときに一定の信号を前記
円盤状記録媒体に記録された記録状態の良否を判定する
信号として出力する手段を有することを特徴とする円盤
状記録媒体再生装置。
[Scope of Claims] (1) Reproducing means for reproducing television video signals and audio signals recorded in the form of frequency modulated signals from a disk-shaped recording medium, and included in the reproduced frequency modulated signals from the reproducing means. detection means for detecting a modulated signal component;
Disc-shaped recording medium reproducing device 0 (2) Modulated signal component, characterized by having means for automatically controlling characteristics of a signal processing circuit that processes a reproduced signal according to a detection signal level detected by the detection means. 2. The disc-shaped recording medium reproducing apparatus according to claim 1, wherein the disc-shaped recording medium reproducing apparatus detects a conveyed ROMA signal component. (3) The disc-shaped recording medium reproducing apparatus according to claim 1, wherein a carrier audio signal component is detected as a modulation signal component. (4) Depending on the detected signal level, the frequency characteristics of the frequency modulation signal transmission circuit in the signal processing circuit, the degree of cancellation effect of the video noise canceler circuit, the frequency characteristics of the pichio signal processing circuit, and the frequency characteristics of the audio signal processing circuit 2. The disc-shaped recording medium reproducing apparatus according to claim 1, wherein the disc-shaped recording medium reproducing apparatus controls at least one of the following. (6) A means for reproducing television video signals and audio signals recorded in the form of frequency modulated signals on a disc-shaped recording medium, and detecting a modulation 1 component contained in the reproduced frequency modulated signals. a detection means, a ratio stage for comparing the detection signal level detected by the detection stage with a predetermined reference signal level, and a ratio stage for comparing the detection signal level detected by the detection stage with a predetermined reference signal level; 1. A disk-shaped recording medium reproducing device, comprising means for outputting a signal for determining whether the recording state recorded on the disk-shaped recording medium is good or bad.
JP57085141A 1982-05-19 1982-05-19 Reproducer of disk recording medium Pending JPS58200410A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP57085141A JPS58200410A (en) 1982-05-19 1982-05-19 Reproducer of disk recording medium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP57085141A JPS58200410A (en) 1982-05-19 1982-05-19 Reproducer of disk recording medium

Publications (1)

Publication Number Publication Date
JPS58200410A true JPS58200410A (en) 1983-11-22

Family

ID=13850377

Family Applications (1)

Application Number Title Priority Date Filing Date
JP57085141A Pending JPS58200410A (en) 1982-05-19 1982-05-19 Reproducer of disk recording medium

Country Status (1)

Country Link
JP (1) JPS58200410A (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5545270A (en) * 1978-09-26 1980-03-29 Sanyo Electric Co Ltd Beat removal system of video player
JPS5550787A (en) * 1978-10-06 1980-04-12 Hitachi Ltd Cross talk reduction system

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5545270A (en) * 1978-09-26 1980-03-29 Sanyo Electric Co Ltd Beat removal system of video player
JPS5550787A (en) * 1978-10-06 1980-04-12 Hitachi Ltd Cross talk reduction system

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