DE2521821A1 - Video disc recorder-reproducer - has device compensating for time errors appearing during signal reproduction - Google Patents

Video disc recorder-reproducer - has device compensating for time errors appearing during signal reproduction

Info

Publication number
DE2521821A1
DE2521821A1 DE19752521821 DE2521821A DE2521821A1 DE 2521821 A1 DE2521821 A1 DE 2521821A1 DE 19752521821 DE19752521821 DE 19752521821 DE 2521821 A DE2521821 A DE 2521821A DE 2521821 A1 DE2521821 A1 DE 2521821A1
Authority
DE
Germany
Prior art keywords
signals
deflection
video disc
help
control voltage
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.)
Withdrawn
Application number
DE19752521821
Other languages
German (de)
Inventor
Roland Cochard
Claude Devenoges
Christian Lietar
Giovanni Odone
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Priority to DE19752521821 priority Critical patent/DE2521821A1/en
Publication of DE2521821A1 publication Critical patent/DE2521821A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/76—Television signal recording
    • H04N5/7605—Television signal recording on discs or drums
    • 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
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
    • G11B7/081—Disposition or mounting of heads or light sources relatively to record carriers for time base error correction by moving the light beam

Landscapes

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

Abstract

The video disc apparatus has a device for the compensation of time errors appearing during reproduction of recorded signals. Deflection of the element scanning the recorded signals takes place tangentially. Periodically occuring synchronisation signals, colour synchronisation signals etc. are separated, and their phase compated with that of reference signals. A control voltage corresponding to the phase deviation is used for the control of the disc driving motor, and also for the scanning element deflection. The deflection of the element is performed with the help of a rotatable coil which is coupled to a mirror and is positioned in magnetic field.

Description

Videonlattenzerät Die Erfindung betrifft ein Videoplattengerät mit einer Anordnung zur Kompensation von Zeitfehlern, die bei der Wiedergabe der aufgezeichneten Signale entstehen, wobei eine Ablenlang des die aufgezeichneten Signale abtastenden Elements in tangentialer Richtung erfolgt. Video disc recorder The invention relates to a video disc recorder an arrangement for compensating for timing errors that occur during playback of the recorded Signals arise, with a variation of the scanning of the recorded signals Element takes place in the tangential direction.

Es ist bekannt, daß Video-Signale mittels Laser-Strahlen auf beschichtete Informationsträger aufgezeichnet werden können. Die Aufzeichnungsspur ist im Allgemeinen spiralförmig. Dasselbe Gerät, mit den die Signale aufgezeichnet werden, kann in sen meisten Fällen auch für die Wiedergabe der Fernsehsignale benützt werden. Das Problem der Wiedergabe kann verhältnismäßIg leicht gelöst werden, wenn zwischen Aufnahme und Wiedergabe der plattenförmige Aufzeichnungsträger nicht vom Gerät heruntergenommen wird. Tjrd nämlich die Platte vom Aufzeichnungsgerät weggenommen und wieder aufgesetzt, oder auf ein anderes Abspielgerät gebracht, so werden unweigerlich Zentrierfehler auftreten, die einen radialen Schlag der Aufzeichnungsspur bedingen.It is known that video signals are coated on by means of laser beams Information carriers can be recorded. The recording track is generally spiral. The same device used to record the signals can be used in In most cases they can also be used to reproduce television signals. That The problem of reproduction can be relatively easily solved if between Recording and playback of the disk-shaped recording media not removed from the device will. That is to say, the disk has been removed from the recorder and put back on again, or transferred to another playback device, centering errors will inevitably occur occur which cause a radial runout of the recording track.

Es sind Mittel bekannt, die es dem Lesekopf erlauben, der Spur in gewissen Grenzen zu folgen. Es muß aber bedacht werden, daß nebst dem sehr auffälligen radialen Schlag eine tangentiale Geschwindigkeitsänderung auftritt, die gerade bei der Wiedergabe von Farbfernsehsignalen sehr schädlich ist.Means are known which allow the read head to read the track in to follow certain limits. But it must be remembered that in addition to the very conspicuous radial impact a tangential change in speed occurs, which occurs at is very detrimental to the reproduction of color television signals.

Zur Kompensation dieser Zeitfehler ist es bekannt, den abtastenden Lichtstrahl in radialer Richtung abzulenken (DT-OS 14 99 774). Die Steuerspannung für diese Richtung wird jedoch durch Phasenvergleich mit einem (freischwingenden) Oszillator gewonnen, der wiederum von den wiedergegebenen Signalen synchronisiert wird.To compensate for this time error, it is known to use the scanning Deflect the light beam in the radial direction (DT-OS 14 99 774). The control voltage for this direction, however, a phase comparison with a (freely oscillating) Oscillator won, which in turn synchronizes from the reproduced signals will.

Soll jedoch ein derartiges Videoplattengerät zur Studiosynchronen Wiedergabe benutzt werden, so ist die bekannte Einrichtung nicht brauchbar.However, such a video disk device should be used for studio synchronization Playback are used, the known device is not usable.

Aufgabe der Erfindung ist es, ein Videoplattengerät mit einer Anordnung zur Kompensation von Zeitfehlern vorzuschlagen, bei dem die Signale synchron mit einen vorgegebenen Takt wiedergegeben werden sollen.The object of the invention is to provide a video disk device with an arrangement to propose to compensate for timing errors in which the signals are synchronous with a given clock should be played.

Die Erfindung ist dadurch gekennzeichnet, daß periodisch wiederkehrende Anteile (Synchronsignal, Parbs7nchronsignal) der wiedergegebenen Signale abgetrennt, und bezüglich Ihrer Phasenlage mit Referenzsignalen verglichen werden, daß eine der Phasenabweichung entsprecbende Regelspannung einerseits zur Steuerung, des die Platte antreibenden Motors (3) und andererseits zur Ablemzung des abtastenden elements verwendet wird.The invention is characterized in that periodically recurring Parts (sync signal, parbs7nchronsignal) of the reproduced signals are separated, and compared with reference signals in terms of their phase position that a the phase deviation corresponding control voltage on the one hand for the control of the Plate driving motor (3) and on the other hand for Ablemzung the sensing element is used.

Bei Geräten mit optisch lesbarer Aufzeichrrang kann mit gutem Erfolg der abtastende Lichtstrahl abgelenkt werden.In the case of devices with an optically readable recording rank, this can be done with good success the scanning light beam can be deflected.

Da die mechanischen und optischen Verhältnisse, die zum Verständnis der Erfindung ven Bedeutung sind, in der o.a.Since the mechanical and optical relationships that are necessary to understand of the invention are meaning in the o.a.

Literatur ausreichend beschrieben sind, ist die folgende Beschreibung lediglich auf den elektrischen Teil der Erfindung gerichtet.Literature are adequately described, is the following description directed only to the electrical part of the invention.

In der ein Ausführungsbeispiel darstellenden Figur ist mit 1 ein Oszillator bezeichnet, der beispielsweise mit Korizontalfrequenz schwingt. Aus den mit der Abtasteinrichtung 4 erzeugten Signalen werden zum Phasenvergleich mit den vom Oszillator erzeugten Signalen geeignete Anteile abgetrenntbespielsweise der horizontalfrequente Anteil des Synchronsignals - und der Phasenvergleichsschaltung 2 zugeführt.In the figure showing an exemplary embodiment, 1 is an oscillator referred to, which oscillates, for example, at the horizontal frequency. From those with the Sampling device 4 generated signals are used for phase comparison with those from the oscillator generated signals separated, e.g. the horizontal frequency Portion of the synchronous signal - and the phase comparison circuit 2 supplied.

Die Ausgangsspannung der Phasenvergleichsschaltung wird, ggf.The output voltage of the phase comparison circuit is, if necessary

nach entsprechender Verstärkung dem Antriebsmotor 3 der Video-Platten zugefjihrt.after appropriate reinforcement the drive motor 3 of the video plates supplied.

Da der Motor 3 zusammen mit der Video-Platte und den weiteren rotierenden Teilen ein verhältnismäßig hohes Trägheitsmoment aufweist, kann die Drehzahl den Schwankungen des Signals, die durch Exzentrizität entstehen, nicht folgen.Since the motor 3 together with the video disk and the other rotating Share has a relatively high moment of inertia, the speed can the Fluctuations in the signal caused by eccentricity do not follow.

Der Regelspannung ist deshalb eine Wechselspannung überlagert, die den durch die Exzentrizität bedingten Zeitfehlern entspricht, und deren Frequenz von der Fernsehnorm und davon abhängt, ob ein Halb-oder ein Vollbild bei einer Umdrehung aufgezeichnet wird. Diese Frequenz kann beispielsweise 28, 50, 30 oder 60 Hz betragen.An alternating voltage is therefore superimposed on the control voltage corresponds to the time errors caused by the eccentricity, and their frequency on the television standard and depends on whether a half or a full screen with one rotation is recorded. This frequency can be, for example, 28, 50, 30 or 60 Hz.

Über das Filter 5 wird die Wechselspannung einer Steuerschaltung 6 für die Ablenteinrichtung 7 zugefiihpt. Die Ablenlreinrichtung 7 kann beispielsweise aus einer drehspulähnlichen Vorpicitung bestehen, die mit einem Spiegel versehen ist. Auch piezoelektrische Einrichtungen sind hierfür geeignetThe AC voltage is fed to a control circuit 6 via the filter 5 for the deflection device 7 supplied. The deflection device 7 can, for example consist of a moving-coil-like Vorpicitung, which is provided with a mirror is. Piezoelectric devices are also suitable for this

Claims (3)

Patentansnrüche 1. Videoplattengerät mit einer Anordnung zur Kompensation von Zeitfehlern, die bei der Wiedergabe der aufgezeichneten Signale entstehen, wobei eine Ablenkung des die aufgezeichneten Signale abtastenden Elements in tangentialer Richtung erfolgt, dadurch gekennzeichnet, daß periodisch wiederkehrende Anteile (Synchronsignal, Farbsynchronsignal) der wiedergegebenen Signale abgetrennt, und bezüglich ihrer Phasenlage mit Referenzsignalen verglichen werden, daß eine der phasenabweichung entsprechende Regelspannung einer seits zur Steuerung des die Platte antreibenden Motors(9) und andererseits zur Ablenkung des abtastenden Elements verwendet wird.Claims 1. Video disk device with an arrangement for compensation of timing errors that arise when reproducing the recorded signals, with a tangential deflection of the element sampling the recorded signals Direction takes place, characterized in that periodically recurring components (Sync signal, color sync signal) separated from the reproduced signals, and be compared in terms of their phase position with reference signals that one of the phase deviation corresponding control voltage on the one hand to control the plate driving motor (9) and on the other hand used to deflect the scanning element will. 2. Gerät nach Anspruch 1, mit optisch lesbarer Aufzeichnung, dadurch gekennzeichnt, a der abtastence lichtstrahl tangential ablenkbar ist.2. Apparatus according to claim 1, with an optically readable recording, characterized marked, a the scanning light beam is tangentially deflectable. 3. Gerät nach Anspruch 2, dadurch gekennzeichnet, daß die Ablenkung mit Hilfe sines mit einer in einem Magnetfeld drehbar gelagerten Spule verbu@@enen Spiegels erfolgt. #################################################### @blenkung mit Hilfe eines @@@ einem @@@@@elektrischen Vorrichtung angeordnet@@ @@ieg@@@ @@@@@@@@ Gerätnach Anspruch 2@ d a d u r c h g e k e n n z e i c h n e t, daß die Regelspannung der Ablenkeinri@@tung über ein Äochpaßfilter zugeiführt ist, dessen @renzfrequenz unserhalb der der Plattendrehzahl entsprechenden Frequenz liegt.3. Apparatus according to claim 2, characterized in that the deflection with the help of sines with a coil rotatably mounted in a magnetic field Mirror takes place. ################################################# ## @blenken arranged with the help of an @@@@@ electrical device @@ @@ ieg @@@ @@@@@@@@ Device according to Claim 2, that the control voltage the deflection is fed via a high-pass filter, the limit frequency of which us lies within the frequency corresponding to the disk speed.
DE19752521821 1975-05-16 1975-05-16 Video disc recorder-reproducer - has device compensating for time errors appearing during signal reproduction Withdrawn DE2521821A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19752521821 DE2521821A1 (en) 1975-05-16 1975-05-16 Video disc recorder-reproducer - has device compensating for time errors appearing during signal reproduction

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19752521821 DE2521821A1 (en) 1975-05-16 1975-05-16 Video disc recorder-reproducer - has device compensating for time errors appearing during signal reproduction

Publications (1)

Publication Number Publication Date
DE2521821A1 true DE2521821A1 (en) 1976-11-25

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Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0007200A1 (en) * 1978-06-30 1980-01-23 Discovision Associates Method and apparatus for controlling the reading of information from an information storage medium
EP0011493A1 (en) * 1978-11-16 1980-05-28 Discovision Associates Method and apparatus for precisely controlling the angular velocity of an information storage disc
EP0011495A1 (en) * 1978-11-16 1980-05-28 Discovision Associates Method and apparatus for rotating an information storage disc
EP0011494A1 (en) * 1978-11-16 1980-05-28 Discovision Associates Method and apparatus for controllably rotating an information storage disc
FR2469772A1 (en) * 1979-11-15 1981-05-22 Sony Corp RECORDING DISC REPRODUCING APPARATUS
EP0035287A2 (en) * 1978-03-27 1981-09-09 Discovision Associates Signal correction system and method
DE3137907A1 (en) * 1980-09-24 1982-06-09 Sony Corp., Tokyo DISK RECORDING DEVICE
EP0057612A2 (en) * 1981-02-02 1982-08-11 Sanyo Electric Co., Ltd. Motor controlling circuit of reproducing apparatus and method of controlling
FR2502870A1 (en) * 1981-03-26 1982-10-01 Sony Corp APPARATUS FOR REPRODUCING A RECORDING MEDIUM SUCH AS A PCM AUDIO DISK
FR2504713A1 (en) * 1981-04-27 1982-10-29 Thomson Csf ANGULAR CODING INFORMATION SUPPORT DISC AND ROTATION DRIVE SYSTEM OF SUCH A DISK
DE3223464A1 (en) * 1981-06-23 1983-01-05 Sony Corp., Tokyo SERVO SYSTEM FOR REGULATING THE SPEED OF A MOTOR FOR ROTATING A PLATE
DE3224478A1 (en) * 1981-06-30 1983-01-20 Sony Corp., Tokyo INFORMATION SIGNAL PLAYER
DE3241581A1 (en) * 1981-11-10 1983-05-19 Sony Corp., Tokyo TURNTABLE
US4608610A (en) * 1980-08-22 1986-08-26 Victor Company Of Japan, Ltd. Jitter compensation system in rotary recording medium reproducing apparatus
EP0286179A1 (en) * 1987-04-08 1988-10-12 Koninklijke Philips Electronics N.V. Apparatus for reading record carriers having substantially concentric or spiral tracks

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0035287A2 (en) * 1978-03-27 1981-09-09 Discovision Associates Signal correction system and method
EP0035803A2 (en) * 1978-03-27 1981-09-16 Discovision Associates Disc spindle servo system
EP0035803A3 (en) * 1978-03-27 1982-02-24 Discovision Associates Disc spindle servo system
EP0035287A3 (en) * 1978-03-27 1982-04-14 Discovision Associates Signal correction system and method
EP0007200A1 (en) * 1978-06-30 1980-01-23 Discovision Associates Method and apparatus for controlling the reading of information from an information storage medium
EP0011493A1 (en) * 1978-11-16 1980-05-28 Discovision Associates Method and apparatus for precisely controlling the angular velocity of an information storage disc
EP0011495A1 (en) * 1978-11-16 1980-05-28 Discovision Associates Method and apparatus for rotating an information storage disc
EP0011494A1 (en) * 1978-11-16 1980-05-28 Discovision Associates Method and apparatus for controllably rotating an information storage disc
FR2469772A1 (en) * 1979-11-15 1981-05-22 Sony Corp RECORDING DISC REPRODUCING APPARATUS
US4608610A (en) * 1980-08-22 1986-08-26 Victor Company Of Japan, Ltd. Jitter compensation system in rotary recording medium reproducing apparatus
DE3137907A1 (en) * 1980-09-24 1982-06-09 Sony Corp., Tokyo DISK RECORDING DEVICE
EP0057612A2 (en) * 1981-02-02 1982-08-11 Sanyo Electric Co., Ltd. Motor controlling circuit of reproducing apparatus and method of controlling
EP0057612A3 (en) * 1981-02-02 1983-02-09 Sanyo Electric Co., Ltd. Motor controlling circuit of reproducing apparatus and method of controlling
FR2502870A1 (en) * 1981-03-26 1982-10-01 Sony Corp APPARATUS FOR REPRODUCING A RECORDING MEDIUM SUCH AS A PCM AUDIO DISK
FR2504713A1 (en) * 1981-04-27 1982-10-29 Thomson Csf ANGULAR CODING INFORMATION SUPPORT DISC AND ROTATION DRIVE SYSTEM OF SUCH A DISK
EP0064897A1 (en) * 1981-04-27 1982-11-17 Thomson-Csf Information carrier disc with angular coding and rotation drive system for such a disc
US4556966A (en) * 1981-04-27 1985-12-03 Thomson-Csf Information carrier disk with angular coding means and a system for driving said disk in rotation
DE3223464A1 (en) * 1981-06-23 1983-01-05 Sony Corp., Tokyo SERVO SYSTEM FOR REGULATING THE SPEED OF A MOTOR FOR ROTATING A PLATE
DE3224478A1 (en) * 1981-06-30 1983-01-20 Sony Corp., Tokyo INFORMATION SIGNAL PLAYER
DE3241581A1 (en) * 1981-11-10 1983-05-19 Sony Corp., Tokyo TURNTABLE
EP0286179A1 (en) * 1987-04-08 1988-10-12 Koninklijke Philips Electronics N.V. Apparatus for reading record carriers having substantially concentric or spiral tracks

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