DE4102800A1 - Phase-locked loop with drift compensation for CD player, etc. - varies equalisation voltage of PLL until bit error rate is minimised during playing of disc - Google Patents

Phase-locked loop with drift compensation for CD player, etc. - varies equalisation voltage of PLL until bit error rate is minimised during playing of disc

Info

Publication number
DE4102800A1
DE4102800A1 DE19914102800 DE4102800A DE4102800A1 DE 4102800 A1 DE4102800 A1 DE 4102800A1 DE 19914102800 DE19914102800 DE 19914102800 DE 4102800 A DE4102800 A DE 4102800A DE 4102800 A1 DE4102800 A1 DE 4102800A1
Authority
DE
Germany
Prior art keywords
phase
locked loop
bit error
error rate
disc
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Withdrawn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
DE19914102800
Other languages
German (de)
Inventor
Dieter Baas
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.)
Deutsche Thomson Brandt GmbH
Original Assignee
Deutsche Thomson Brandt 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 Deutsche Thomson Brandt GmbH filed Critical Deutsche Thomson Brandt GmbH
Priority to DE19914102800 priority Critical patent/DE4102800A1/en
Publication of DE4102800A1 publication Critical patent/DE4102800A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
    • G11B11/10—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
    • G11B11/105—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing
    • G11B11/10502—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing characterised by the transducing operation to be executed
    • G11B11/10515—Reproducing
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
    • G11B11/10—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
    • G11B11/105—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing
    • G11B11/10595—Control of operating function
    • 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
    • G11B19/02—Control of operating function, e.g. switching from recording to reproducing
    • G11B19/04—Arrangements for preventing, inhibiting, or warning against double recording on the same blank or against other recording or reproducing malfunctions
    • 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
    • G11B7/004—Recording, reproducing or erasing methods; Read, write or erase circuits therefor
    • G11B7/005—Reproducing
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION, OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
    • H03L7/00—Automatic control of frequency or phase; Synchronisation
    • H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop

Abstract

Data are read from a record carrier in a reproducing appts. having a phase-locked loop with lag compensation and a bit error rate decoder. The equalising voltage of the phase-locked loop is varied until the bit error rate of the data signal is minimised. The equalisation of the phase-locked loop is pref. only carried out when the read data are error-free. USE/ADVANTAGE - For CD, video disc, DRAW disc and magneto-optical disc players. Allows compensation, e.g. for temp. variations, during playing of disc

Description

Die Erfindung betrifft ein Verfahren zum Abgleich eines Phasen­ regelkreises mit Nachlaufsynchronisation in einem Wiedergabege­ rät, das die digital aufgezeichneten Daten eines Aufzeichnungs­ trägers liest und mit einem Decoder ausgestattet ist, der die Bitfehlerrate des Datensignals bestimmt.The invention relates to a method for adjusting a phase control loop with tracking synchronization in one playback area advises that the digitally recorded data of a recording carrier reads and is equipped with a decoder that the Bit error rate of the data signal determined.

Ein CD-Spieler ist z. B. mit einem Phasenregelkreis mit Nachlauf­ synchronisation ausgerüstet, der automatisch vor dem Abspielen einer Platte abgeglichen wird. Wenn sich aber während des Ab­ spielens der Platte die Temperatur stark ändert, ist ein neuer Abgleich des Phasenregelkreises erforderlich, der sich bei be­ kannten CD-Spielern jedoch nicht während des Abspielens der Platte durchführen läßt.A CD player is e.g. B. with a phase locked loop with wake synchronization equipped automatically before playing a plate is adjusted. But if during the Ab playing the plate changes the temperature a lot is a new one Alignment of the phase locked loop required, which is at be did not know CD players while playing the Plate can be carried out.

Es ist daher Aufgabe der Erfindung, ein Verfahren für einen Abgleich eines Phasenregelkreises in einem CD-Spieler so zu gestalten, daß die Drift einzelner Parameter des Phasenregel­ kreises sofort durch Neuabgleich kompensiert wird.It is therefore an object of the invention to provide a method for a Adjustment of a phase locked loop in a CD player shape that the drift of individual parameters of the phase rule circle is immediately compensated by readjustment.

Die Erfindung löst diese Aufgabe dadurch, daß die Abgleichspan­ nung für den Phasenregelkreis so lange verändert wird, bis die Bitfehlerrate im Datensignal ein Minimum annimmt.The invention solves this problem in that the adjustment chip voltage for the phase locked loop is changed until the Bit error rate in the data signal assumes a minimum.

Die Erfindung geht von der Erkenntnis aus, daß eine Drift ein­ zelner Parameter des Phasenregelkreises mit Nachlaufsynchronisa­ tion - im weiteren Verlauf mit der üblichen Bezeichnung PLL abgekürzt - eine Erhöhung der Bitfehlerrate zur Folge hat. Es wird daher die Bitfehlerrate, die der Decoder des CD-Spielers mißt, stets auf ein Minimum reduziert, indem die Abgleichspan­ nung für die PLL verändert wird. Eine Erhöhung der Bitfehlerra­ te infolge der Drift einzelner Parameter der PLL wird daher so­ fort durch Neuabgleich der PLL kompensiert. Während des Abspiel­ ens einer Platte wird die PLL daher laufend abgeglichen.The invention is based on the knowledge that a drift occurs individual parameters of the phase-locked loop with overrun synchronization tion - in the further course with the usual name PLL abbreviated - results in an increase in the bit error rate. It is therefore the bit error rate that the decoder of the CD player measures, always reduced to a minimum by the adjustment span voltage for the PLL is changed. An increase in the bit error margin te as a result of the drift of individual parameters of the PLL therefore becomes so continued to be compensated for by readjusting the PLL. During playback The PLL is therefore continuously adjusted on a disk.

Eine im Anspruch 2 angegebene Ausgestaltung der Erfindung sieht vor, den Abgleich nur dann durchzuführen, wenn das Lesen der Da­ ten vom Aufzeichnungsträger fehlerfrei erfolgt.An embodiment of the invention specified in claim 2 provides before performing the adjustment only when reading the Da made by the recording medium without errors.

Die Erfindung ist jedoch nicht auf CD-Spieler beschränkt. Sie ist ebenso für Videoplattenspieler, DRAW-Disc-Spieler und ma­ gneto-optische Wiedergabegeräte geeignet.However, the invention is not limited to CD players. they is also for video record players, DRAW disc players and ma gneto-optical playback devices.

Claims (2)

1. Verfahren zum Abgleich eines Phasenregelkreises mit Nach­ laufsynchronisation in einem Wiedergabegerät, das die digital aufgezeichneten Daten eines Aufzeichnungsträgers liest und mit einem Decoder ausgestattet ist, der die Bitfehlerrate des Datensignals bestimmt, dadurch gekennzeichnet, daß die Abgleichspannung für den Phasenregelkreis so lange verändert wird, bis die Bitfehlerrate des Datensignals ein Minimum annimmt.1. A method for adjusting a phase-locked loop with after-run synchronization in a playback device that reads the digitally recorded data from a recording medium and is equipped with a decoder that determines the bit error rate of the data signal, characterized in that the adjustment voltage for the phase-locked loop is changed as long as until the bit error rate of the data signal takes a minimum. 2. Verfahren nach Anspruch 1, dadurch gekenn­ zeichnet, daß bei fehlerhaftem Lesen der Daten kein Abgleich durchgeführt wird.2. The method according to claim 1, characterized indicates that if the data is read incorrectly, no Adjustment is carried out.
DE19914102800 1991-01-31 1991-01-31 Phase-locked loop with drift compensation for CD player, etc. - varies equalisation voltage of PLL until bit error rate is minimised during playing of disc Withdrawn DE4102800A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19914102800 DE4102800A1 (en) 1991-01-31 1991-01-31 Phase-locked loop with drift compensation for CD player, etc. - varies equalisation voltage of PLL until bit error rate is minimised during playing of disc

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19914102800 DE4102800A1 (en) 1991-01-31 1991-01-31 Phase-locked loop with drift compensation for CD player, etc. - varies equalisation voltage of PLL until bit error rate is minimised during playing of disc

Publications (1)

Publication Number Publication Date
DE4102800A1 true DE4102800A1 (en) 1992-08-06

Family

ID=6424040

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19914102800 Withdrawn DE4102800A1 (en) 1991-01-31 1991-01-31 Phase-locked loop with drift compensation for CD player, etc. - varies equalisation voltage of PLL until bit error rate is minimised during playing of disc

Country Status (1)

Country Link
DE (1) DE4102800A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19517405A1 (en) * 1995-05-16 1996-11-21 Thomson Brandt Gmbh Signal processing system for digital signals
FR2775143A1 (en) * 1998-02-18 1999-08-20 Atg Sa Method for automatic correction of gain of clock phase servo loop in optical disc reader/recorder
EP1081856A2 (en) * 1999-09-06 2001-03-07 Victor Company Of Japan, Ltd. Generator of clock signals and method for generating clock signals

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2087177A (en) * 1978-02-27 1982-05-19 Schlumberger Technology Corp Method and apparatus for stabilizing a carrier tracking loop
DE3524145A1 (en) * 1984-07-10 1986-01-23 Kabushiki Kaisha Toshiba, Kawasaki, Kanagawa CARRIER RECOVERY CIRCUIT FOR PSK SIGNALS
US4628497A (en) * 1983-10-17 1986-12-09 U.S. Philips Corporation Apparatus for reproducing information from an optically readable record carrier

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2087177A (en) * 1978-02-27 1982-05-19 Schlumberger Technology Corp Method and apparatus for stabilizing a carrier tracking loop
US4628497A (en) * 1983-10-17 1986-12-09 U.S. Philips Corporation Apparatus for reproducing information from an optically readable record carrier
DE3524145A1 (en) * 1984-07-10 1986-01-23 Kabushiki Kaisha Toshiba, Kawasaki, Kanagawa CARRIER RECOVERY CIRCUIT FOR PSK SIGNALS

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
JP 61-32660 A In: Patents Abstr. of Japan Sect. E, Vol 10, Nr. 170 (E-412), S. 58 *

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19517405A1 (en) * 1995-05-16 1996-11-21 Thomson Brandt Gmbh Signal processing system for digital signals
US5940449A (en) * 1995-05-16 1999-08-17 Deutsche Thomson-Brandt Gmbh Signal processing system for digital signals
FR2775143A1 (en) * 1998-02-18 1999-08-20 Atg Sa Method for automatic correction of gain of clock phase servo loop in optical disc reader/recorder
WO1999043088A1 (en) * 1998-02-18 1999-08-26 Atg Method for automatically correcting a phase servo loop gain
EP1081856A2 (en) * 1999-09-06 2001-03-07 Victor Company Of Japan, Ltd. Generator of clock signals and method for generating clock signals
EP1081856A3 (en) * 1999-09-06 2001-04-18 Victor Company Of Japan, Ltd. Generator of clock signals and method for generating clock signals
US6738444B1 (en) 1999-09-06 2004-05-18 Victor Company Of Japan, Ltd. Apparatus and method of generating clock signal

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