JPS60126978A - Motor servo circuit of record and reproduction type video disk player - Google Patents
Motor servo circuit of record and reproduction type video disk playerInfo
- Publication number
- JPS60126978A JPS60126978A JP58234269A JP23426983A JPS60126978A JP S60126978 A JPS60126978 A JP S60126978A JP 58234269 A JP58234269 A JP 58234269A JP 23426983 A JP23426983 A JP 23426983A JP S60126978 A JPS60126978 A JP S60126978A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- motor
- signal
- phase
- disk
- 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
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B19/00—Driving, starting, stopping record carriers not specifically of filamentary or web form, or of supports therefor; Control thereof; Control of operating function ; Driving both disc and head
- G11B19/20—Driving; Starting; Stopping; Control thereof
- G11B19/28—Speed controlling, regulating, or indicating
Landscapes
- Rotational Drive Of Disk (AREA)
- Control Of Electric Motors In General (AREA)
Abstract
Description
【発明の詳細な説明】
〔発明の利用分野〕
本発明は、記録再生型ビデオディスクプレーヤ等におけ
るモータサーボ回路に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a motor servo circuit in a recording/reproducing video disc player or the like.
記録再生型ビデオディスクプレーヤにおいて円盤状記録
媒体（以下、ディスクと略す）面上の記録位置合わせ用
のマーク信号を検出して位相制御を行うモータサーボ回
路の従来例について第１図を用いて以下詳細に説明する
。A conventional example of a motor servo circuit that performs phase control by detecting mark signals for recording position alignment on the surface of a disk-shaped recording medium (hereinafter referred to as disk) in a recording/reproducing video disk player will be described below with reference to FIG. Explain in detail.
第１図は従来のモータサーボ回路を示すブロック図であ
る。FIG. 1 is a block diagram showing a conventional motor servo circuit.
第１図において、１は赤外発光ダイオード等より成るホ
トセンサー、２は位相制御回路であり、記録位置合わせ
用のマーク信号を波形整形する波形整形回路６と、基準
信号周波数発生回路（発生周波数は５ｏＨｚ）４と、前
記基準信号周波数と前記記録位置合わせ用のマーク信号
との位相誤差を検出する位相検波回路５と９位相検波回
路５の出力信号を増幅・処理する位相補償回路６により
構成されている。また７はモータ８は周波数発電機であ
る。９は速度制御回路であり、周波数発電機８の出力信
号を一振幅制限す゛るリミッタ回路１０と、リミッタ回
路１Ｑ出力の電圧レベルを変換する電圧レベル変換回路
１１と。In FIG. 1, 1 is a photo sensor consisting of an infrared light emitting diode, etc., 2 is a phase control circuit, a waveform shaping circuit 6 that shapes the waveform of a mark signal for recording position alignment, and a reference signal frequency generation circuit (generation frequency (5oHz) 4, a phase detection circuit 5 that detects a phase error between the reference signal frequency and the mark signal for recording position alignment, and a phase compensation circuit 6 that amplifies and processes the output signal of the phase detection circuit 5. has been done. Moreover, the motor 8 7 is a frequency generator. Reference numeral 9 designates a speed control circuit, including a limiter circuit 10 that limits the output signal of the frequency generator 8 by one amplitude, and a voltage level conversion circuit 11 that converts the voltage level of the output of the limiter circuit 1Q.
電圧レベル変換回路１１出力の立上りまたは立下りでパ
ルスを発生させる単安定マルチバイブレータ回路（以下
、モノマルチ回路と略す）１２とモノマルチ回路１２出
力からの直流成分を抽出する低域フィルター回路（以下
、ＬＰＦ回路と略す）１３と、ＬＰＦ回路１６出力信号
を増幅・処理する位相補償回路１４により構成されてい
る。１５は加算回路で、前記位相制御回路２の出力信号
と前記速度制御回路９の出力信号を加算している。１６
は加算回路１５の出力を増幅する増幅回路１７は基準電
圧発生回路、１８は基準電圧発生回路１７出力と前記Ｌ
ＰＦ回路１３の出力信号を比較するコンパレータ回路で
ある。１９は手動スイッチ２０はモータ駆動回路、２１
は切換回路でちゃ、モータ起動時、手動スイッチ１９’
ｉａ端子に切換えると切換回路２１は連動してａ端子に
切換わり、増幅回路１６の出力信号をモータ駆動回路２
０に入力する。また、手動スイッチ１１：ｂ端子をこ切
換えると切換回路２１は連動してｂ端子に切換わりモー
タ駆動回路２００Å力をアースに接続し、モータ７を停
止させる。２２は加減速制御回路であり、手動スイッチ
１９によるモータ起動時、モータ７が除々に回転して前
記ＬＰＦ回路１５の出力電圧が基準電圧発生回路１７の
出力電圧値より高くなるまで加速制御を行ない、またモ
ータ停止時、前記ＬＰＦ回路１３の出力電圧が基準電圧
発生回路１７の出力電圧値より低くなるまで減速制御を
行なうものである。２３はディスク、２４はデーイスク
２３の内周部にあらかじめ凹凸の形状で記録されている
記録位置合わせ用のマーク信号であり、外部からの映像
信号は奇数フィールド（あるいは偶数フィールド）の垂
直同期信号がこのマーク部分と一致する様に記録される
。A monostable multivibrator circuit (hereinafter referred to as a mono-multi-circuit) 12 generates a pulse at the rising or falling edge of the output of the voltage level conversion circuit 11, and a low-pass filter circuit (hereinafter referred to as a mono-multi-vibrator circuit) extracts a DC component from the output of the mono-multi circuit 12. , abbreviated as an LPF circuit) 13, and a phase compensation circuit 14 that amplifies and processes the output signal of the LPF circuit 16. Reference numeral 15 denotes an adder circuit that adds the output signal of the phase control circuit 2 and the output signal of the speed control circuit 9. 16
An amplifier circuit 17 that amplifies the output of the adder circuit 15 is a reference voltage generation circuit, and 18 is a reference voltage generation circuit that amplifies the output of the reference voltage generation circuit 17 and the L
This is a comparator circuit that compares the output signals of the PF circuit 13. 19 is a manual switch 20 is a motor drive circuit, 21
is a switching circuit, and when the motor starts, manual switch 19'
When switched to the ia terminal, the switching circuit 21 switches to the a terminal in conjunction, and the output signal of the amplifier circuit 16 is transferred to the motor drive circuit 2.
Enter 0. Further, when the manual switch 11:b terminal is switched, the switching circuit 21 is interlocked and switched to the b terminal, connecting the motor drive circuit 200A to ground, and stopping the motor 7. 22 is an acceleration/deceleration control circuit which, when the motor is started by the manual switch 19, performs acceleration control until the motor 7 rotates gradually and the output voltage of the LPF circuit 15 becomes higher than the output voltage value of the reference voltage generation circuit 17. Further, when the motor is stopped, deceleration control is performed until the output voltage of the LPF circuit 13 becomes lower than the output voltage value of the reference voltage generation circuit 17. 23 is a disk, 24 is a mark signal for recording position alignment recorded in advance in an uneven shape on the inner circumference of the disk 23, and the video signal from the outside is a vertical synchronization signal of an odd field (or an even field). It is recorded to match this mark part.
このような系において、モータ起動時、前記手動スイッ
チ１９がａ端子に切換えられると、前述のごとく切換回
路２１が連動してａ端子に切換わり、増幅回路１６出力
の加速電圧がモータ駆動回路２０ｔ−経て、モータ７に
印加され、ＬＰＦ回路１３の出力信号が基準電圧発生回
路１７の出力電圧より高くなるまで加速される。しかる
後、後述するメカニズムから前記位相制御回路２と速度
制御回路９が引込み動作をして、ディスク２３は所定の
回転数で回転する０
次に位相制御回路２と速度制御回路９の動作について説
明する。In such a system, when the motor is started, when the manual switch 19 is switched to the a terminal, the switching circuit 21 is linked and switched to the a terminal as described above, and the accelerating voltage output from the amplifier circuit 16 is changed to the motor drive circuit 20t. - is applied to the motor 7 and accelerated until the output signal of the LPF circuit 13 becomes higher than the output voltage of the reference voltage generation circuit 17. Thereafter, the phase control circuit 2 and speed control circuit 9 perform a retraction operation using a mechanism described later, and the disk 23 rotates at a predetermined rotational speed.Next, the operations of the phase control circuit 2 and speed control circuit 9 will be explained. do.
第２図はディスク面上の記録位置合わせ用のマーク信号
を第１図におけるホトセンサが検出したときの検出出力
波形を示す波形図である。FIG. 2 is a waveform diagram showing a detection output waveform when the photosensor in FIG. 1 detects a mark signal for recording position alignment on the disk surface.
第１図に示す様に、ディスク２ろが回転するとホトセン
サー１が記録位置合せ用のマーク信号２４を検出し、波
形整形回路３を経て、位相検波回路５に入力される。通
常、ホトセンサー１からは第２図に示したように７ｖ前
後の直流電圧が出力され、記録位置合わせ用のマーク信
号部分においてさらに約１ｖ電圧の低い信号が出力され
る。As shown in FIG. 1, when the disk 2 rotates, the photosensor 1 detects a mark signal 24 for recording position alignment, which is input to the phase detection circuit 5 via the waveform shaping circuit 3. Normally, the photosensor 1 outputs a DC voltage of about 7V as shown in FIG. 2, and a lower signal of about 1V is output in the mark signal portion for recording position alignment.
次に前記位相検波回路５では、波形整形回路６からの出
力信号と基準信号発生回路４の出力信号との位相比較が
行なわれ、誤差信号が出力される。該出力は位相補償回
路６を経て、増幅・処理された後、加算回路１５に入力
される。Next, the phase detection circuit 5 compares the phases of the output signal from the waveform shaping circuit 6 and the output signal of the reference signal generation circuit 4, and outputs an error signal. The output passes through the phase compensation circuit 6, is amplified and processed, and is then input to the addition circuit 15.
一方、周波数発電機８からの出力信号はリミッタ回路１
０ヲ経て、電圧レベル変換回路１１でモノマルチ回路１
２の動作電圧に変換される０モノマルチ回路１２では、
入力信号の立上りもしくは立下りに同期したパルスを出
力する。出力したパルスはＬＰＦ回路１３を経ることに
より、直流成分が抽出され、位相補償回路１４で増幅・
処理された後、前記位相制御回路２の出力信号と共に加
算回路１５に入力される。さらに前述のごとく、増幅回
路１６．切換回路２１．モータ駆動回路２０ヲそれぞれ
経て、モータ７の回転数を制御している。On the other hand, the output signal from the frequency generator 8 is transmitted to the limiter circuit 1
After 0, mono multi circuit 1 with voltage level conversion circuit 11
In the 0 mono multi circuit 12, which is converted to an operating voltage of 2,
Outputs a pulse synchronized with the rising or falling edge of the input signal. The output pulse passes through the LPF circuit 13, where the DC component is extracted, and the phase compensation circuit 14 amplifies and amplifies it.
After being processed, it is input to the adder circuit 15 together with the output signal of the phase control circuit 2. Furthermore, as mentioned above, the amplifier circuit 16. Switching circuit 21. The rotation speed of the motor 7 is controlled through each motor drive circuit 20.
このように、記録再生型ビデオディスクプレ−ヤでは、
特にディスクへの情報記録時、ホトセンサー１からの記
録位置合わせ用のマーク信号部分の情報が不可欠であり
、これにより前述のごとく位相制御回路２を動作させて
いる。ところが、従来の技術においては、ホトセンサ１
から出力される記録位置合わせ用のマーク信号の周波数
はモータ回転周波数と同じ３０１１ｚでありこの周波数
で位相制御系のサンプル制御を構成しているため、開ル
ープゲインを大きく取ることができない。このため、デ
ィスク２３の風損。In this way, in a recording/playback type video disc player,
Particularly when recording information on a disk, information on the mark signal portion for recording position alignment from the photosensor 1 is essential, and this information operates the phase control circuit 2 as described above. However, in the conventional technology, the photo sensor 1
The frequency of the mark signal for recording position alignment outputted from the motor is 3011z, which is the same as the motor rotation frequency, and since this frequency constitutes the sample control of the phase control system, it is not possible to obtain a large open loop gain. Therefore, the windage loss of the disk 23 occurs.
その他の影響で、モータ７のワウ成分が最大１０μＳｐ
ｐ＆ｊ発生し、後段の信号処理系におけるＣｈａｒｇｅ
Ｃｏｕｐｌｅｄ Ｄｅｖｉｃｅ（以下、ＣＯＤと略記
する。）による時間軸補正系（図示省略する）が不安定
となる問題点が生じていた。Due to other influences, the wah component of motor 7 is up to 10 μSp.
P&J occurs and Charge in the subsequent signal processing system
A problem has arisen in that a time axis correction system (not shown) using a coupled device (hereinafter abbreviated as COD) becomes unstable.
本発明の目的は、前記した従来技術の欠点をなく、シ、
記録再生型ビデオディスクプレーヤ等におけるモータの
ワウ成分を低減しうるモータサーボ回路を提供すること
にある。The object of the present invention is to eliminate the drawbacks of the prior art described above, and to
An object of the present invention is to provide a motor servo circuit that can reduce the wow component of a motor in a recording/reproducing video disc player or the like.
本発明の要点は、ディスクへの情報記録時の位相制御系
をディスク面上記録位置合わせ用のマーク信号をｍｍい
て構成し、またディスクからの１青感再生時の位相制御
系は再生映像信号から分離した水平同期信号もしくはモ
ータに直結された周波数発電機の出力信号を用いて構成
するようにした点にある。The main point of the present invention is that the phase control system when recording information on the disk is configured by using a mark signal for recording position alignment on the disk surface, and the phase control system when reproducing one blue feeling from the disk is configured using the reproduced video signal. The point is that it is configured using a horizontal synchronization signal separated from the motor or an output signal of a frequency generator directly connected to the motor.
第３図は本発明の一実施例を示すブロック図である。 FIG. 3 is a block diagram showing one embodiment of the present invention.
第６図において、第１図と同一機能を有する部分は同一
番号を示し、その説明を省略する。In FIG. 6, parts having the same functions as those in FIG. 1 are designated by the same numbers, and their explanations will be omitted.
また、２５は信号を再生するピックアップ、２６はＦ’
Ｍ復調回路、２７は水平同期信号全分離する同期１６
号分離回路である。また、２８は情報再生系の第２の位
相制御回路であり、水平同期信号周波数の基準信号を発
生する基準信号発生回路２９と、前記基準信号と再生水
平同期信号との位相誤差を検出する位相検波回路３０と
１位相検波回路３０の出力信号を増幅・処理する位相補
償回路３１により構成されている。６２は切換回路で、
ディスク２３への情報記録時はａ端子に、情報再生時は
ｂ端子に切換えられる。Also, 25 is a pickup for reproducing the signal, and 26 is F'
M demodulation circuit 27 is a synchronization circuit 16 that separates all horizontal synchronization signals
This is a signal separation circuit. Further, 28 is a second phase control circuit of the information reproduction system, which includes a reference signal generation circuit 29 that generates a reference signal of the horizontal synchronization signal frequency, and a phase control circuit that detects a phase error between the reference signal and the reproduced horizontal synchronization signal. It is composed of a detection circuit 30 and a phase compensation circuit 31 that amplifies and processes the output signal of the 1-phase detection circuit 30. 62 is a switching circuit;
When recording information on the disc 23, the terminal is switched to the a terminal, and when reproducing information, the terminal is switched to the b terminal.
第３図において、速度制御回路９および第１の位相制御
回路２等の動作については、第１図に示した従来技術と
同じため省略し、ここでは第２の位相制御回路２８の動
作を中心に説明する。In FIG. 3, the operations of the speed control circuit 9, the first phase control circuit 2, etc. are the same as those of the prior art shown in FIG. Explain.
情報記録時、前述のように切換回路３２がａ端子に切換
えられ、従来技術で示したような所定動作を行ない、モ
ータ７が制御される。When recording information, the switching circuit 32 is switched to the a terminal as described above, and the motor 7 is controlled by performing the predetermined operation as shown in the prior art.
次に、情報再生時は、寸ず切換回路３２がｂ端子に切換
えられる。一方、ディスク２３からの再生信号がピッ、
グアツブ２５ヲ経て、ＦＭ復調回路２６に入力される。Next, when reproducing information, the instant switching circuit 32 is switched to the b terminal. On the other hand, the playback signal from the disk 23 beeps.
The signal is input to the FM demodulation circuit 26 through the filter 25.
この再生信号はＦＭ復調回路２６で映像信号に復調され
、さらに同期分離回路２７において水平同期信号が分離
され出力される。This reproduced signal is demodulated into a video signal by an FM demodulation circuit 26, and further a horizontal synchronization signal is separated and outputted by a synchronization separation circuit 27.
位相検波回路３０では同期分離回路２７からの再生水平
同期１言号が基準信号周波数発生回路２９からの基準信
号と位相比較されるが、この際のサンプル制御の周波数
は１５．７３４ＫＨｚで、従来の３０Ｈ４に比べて５２
５倍高いため、位相制御系全体としては大きな開ループ
ゲインが得られることになる。In the phase detection circuit 30, the phase of one reproduced horizontal synchronization word from the synchronization separation circuit 27 is compared with the reference signal from the reference signal frequency generation circuit 29, but the sampling control frequency at this time is 15.734 KHz, which is different from the conventional one. 52 compared to 30H4
Since it is five times higher, a large open-loop gain can be obtained for the entire phase control system.
位相検波回路３０出力の位相誤差信号はさらに位相補償
回路ろ１で増幅・処理され、切換回路３２ケ経て加算回
路１５へと入力される。この後、増幅回路１６．切換回
路２１．モータ駆動回路２０をそれぞれ経て、モータ７
を制御する。The phase error signal output from the phase detection circuit 30 is further amplified and processed by the phase compensation circuit 1, and is input to the addition circuit 15 through 32 switching circuits. After this, the amplifier circuit 16. Switching circuit 21. After passing through the motor drive circuit 20, the motor 7
control.
これにより、ディスク２３からの情報再生時、ディスク
２３の風損その他の影響で発生するモータ７のワウ成分
が低減化され、後段の信号処理系におけるＣ ＣＩ）
（図示省略する）による時間軸補正系は安定となる。As a result, when reproducing information from the disk 23, the wow component of the motor 7 that occurs due to windage damage of the disk 23 and other effects is reduced, and the CCI in the subsequent signal processing system is reduced.
(not shown) becomes stable.
第４図は本発明の他の実施例を示すブロック図である。FIG. 4 is a block diagram showing another embodiment of the present invention.
第４図において、３３はリミッタ回路、６４は電圧レベ
ル変換回路、である。In FIG. 4, 33 is a limiter circuit, and 64 is a voltage level conversion circuit.
本実施例では、第４図に示１−だように情報再生時、モ
ータに直結されたモータ回転周波数より高い周波数を有
する周波数発電機８の出刃信号を用いて、位相制御系を
構成している。この場合も、前述の実施例と同様にモー
タのワウ成分が低減化される。ただし、基準信号発生器
として、周知のフライホイール発振器を用いている。In this embodiment, as shown in FIG. 4, when reproducing information, a phase control system is constructed using the blade signal of the frequency generator 8 which is directly connected to the motor and has a higher frequency than the motor rotation frequency. There is. In this case as well, the wow component of the motor is reduced as in the above-described embodiment. However, a well-known flywheel oscillator is used as the reference signal generator.
本発明によれば、ディスクからの情報再生時モータの回
転周波数より高い周波数でサンプル制御を行なうため、
従来に比べて大きな開ループゲインを得ることができ、
ディスクの風損その他の影響で発生するモータのワウ成
分が低減し、後段の信号処理系におけるＣＣＤによる時
間軸補正系が安定するといった効果がある。According to the present invention, since sample control is performed at a frequency higher than the rotational frequency of the motor when reproducing information from a disk,
It is possible to obtain a larger open loop gain than before,
This has the effect of reducing the motor wow component caused by disk windage and other effects, and stabilizing the time axis correction system using the CCD in the subsequent signal processing system.
第１図は従来のモータサーボ回路を示すブロック図、第
２図は第１図におけるホトセンサの出力波形を示す波形
図、第３図は本発明の一実施例を示すブロック図、第４
図は本発明の他の実施例を示すブロック図、である。
１・・・ホトセンサー ２・・・第１の位相制御回路７
・・・モータ ８・・・周波数発電機９・・・速度制御
回路 １６・・・増幅回路１８・・・コンパレータ回路
１９・・・手動スイッチ ２１・・・切換回路２２・・
・加減速制御回路 ２３・・・ディスク２４・・・記録
位置合わせ用のマーク信号２６・・・ＦＭ復調回路 ２
７・・・同期信号分離回路２８・・・第２の位相制御回
路
６２・・・切換回路 ３３・・・リミッタ回路５４・・
・電圧レベル変換回路
第２訂
マーク信号＃Ｓ分
り千聞FIG. 1 is a block diagram showing a conventional motor servo circuit, FIG. 2 is a waveform diagram showing the output waveform of the photosensor in FIG. 1, FIG. 3 is a block diagram showing an embodiment of the present invention, and FIG.
The figure is a block diagram showing another embodiment of the present invention. 1... Photosensor 2... First phase control circuit 7
...Motor 8...Frequency generator 9...Speed control circuit 16...Amplification circuit 18...Comparator circuit 19...Manual switch 21...Switching circuit 22...
・Acceleration/deceleration control circuit 23... Disc 24... Mark signal for recording position alignment 26... FM demodulation circuit 2
7... Synchronous signal separation circuit 28... Second phase control circuit 62... Switching circuit 33... Limiter circuit 54...
・Voltage level conversion circuit 2nd edition mark signal #S understanding
Claims (1)
ボ回路において、ディスクへの情報記録時、円盤状記録
媒体面上にあらかじめ設けられた記録位置合わせ用のマ
ーク部分を検出して基準信号周波数と位相比較を行う第
１の位相制御回路の出力信号と、モータの回転速度変化
を検出して行う速度制御回路の出力信号との加算信号に
よりモータの制御を行いディスクからの情報再生時、再
生映像信号から分離した水平同期信号またはモータに直
結された周波数発電機の出力信号を用いて基準信号周波
数と位相比較を行う第２の位相制御回路の出力信号と、
前記速度制御回路の出力信月との加算信号によりモータ
の制御を行うことを特徴とする記録再生型ビデオディス
クプレーヤ等のモータサーボ回路。1) In the motor servo circuit of a record/playback type video disc player, etc., when recording information on a disc, a mark part for recording position alignment provided in advance on the surface of a disc-shaped recording medium is detected and the phase is compared with the reference signal frequency. The motor is controlled by the sum of the output signal of the first phase control circuit that performs an output signal of a second phase control circuit that performs phase comparison with a reference signal frequency using a separated horizontal synchronization signal or an output signal of a frequency generator directly connected to the motor;
A motor servo circuit for a recording/reproducing video disc player or the like, characterized in that the motor is controlled by a signal added to the output signal of the speed control circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58234269A JPS60126978A (en) | 1983-12-14 | 1983-12-14 | Motor servo circuit of record and reproduction type video disk player |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58234269A JPS60126978A (en) | 1983-12-14 | 1983-12-14 | Motor servo circuit of record and reproduction type video disk player |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS60126978A true JPS60126978A (en) | 1985-07-06 |
Family
ID=16968317
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58234269A Pending JPS60126978A (en) | 1983-12-14 | 1983-12-14 | Motor servo circuit of record and reproduction type video disk player |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60126978A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62170072A (en) * | 1986-01-21 | 1987-07-27 | Nippon Kogaku Kk <Nikon> | Reproducing device for discoid rotary recording medium |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5233506A (en) * | 1975-09-08 | 1977-03-14 | Matsushita Electric Ind Co Ltd | Control device of the revolving component of the magnetic recording reproduction device |
| JPS52128103A (en) * | 1976-04-19 | 1977-10-27 | Sanyo Electric Co Ltd | Rotary phase control circuit in video signal reproducing unit |
| JPS551626A (en) * | 1978-06-19 | 1980-01-08 | Victor Co Of Japan Ltd | Information signal recording and reproducing system |
| JPS56165956A (en) * | 1980-05-22 | 1981-12-19 | Pioneer Video Corp | Time axis variation correcting system for reproducing device of recorded information |
| JPS57162890A (en) * | 1981-03-31 | 1982-10-06 | Teac Co | Information signal recorder |
-
1983
- 1983-12-14 JP JP58234269A patent/JPS60126978A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5233506A (en) * | 1975-09-08 | 1977-03-14 | Matsushita Electric Ind Co Ltd | Control device of the revolving component of the magnetic recording reproduction device |
| JPS52128103A (en) * | 1976-04-19 | 1977-10-27 | Sanyo Electric Co Ltd | Rotary phase control circuit in video signal reproducing unit |
| JPS551626A (en) * | 1978-06-19 | 1980-01-08 | Victor Co Of Japan Ltd | Information signal recording and reproducing system |
| JPS56165956A (en) * | 1980-05-22 | 1981-12-19 | Pioneer Video Corp | Time axis variation correcting system for reproducing device of recorded information |
| JPS57162890A (en) * | 1981-03-31 | 1982-10-06 | Teac Co | Information signal recorder |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62170072A (en) * | 1986-01-21 | 1987-07-27 | Nippon Kogaku Kk <Nikon> | Reproducing device for discoid rotary recording medium |
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