Processing

Please wait...

Settings

Settings

1. WO2000039930 - PHASE-LOCKED LOOP AND DEVICE FOR READING AND/OR WRITING INFORMATION FROM/ONTO A RECORD CARRIER

Publication Number WO/2000/039930
Publication Date 06.07.2000
International Application No. PCT/EP1999/010062
International Filing Date 14.12.1999
IPC
G11B 7/0045 2006.01
GPHYSICS
11INFORMATION STORAGE
BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
7Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation, reproducing using an optical beam at lower power; Record carriers therefor
004Recording, reproducing or erasing methods; Read, write or erase circuits therefor
0045Recording
G11B 7/005 2006.01
GPHYSICS
11INFORMATION STORAGE
BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
7Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation, reproducing using an optical beam at lower power; Record carriers therefor
004Recording, reproducing or erasing methods; Read, write or erase circuits therefor
005Reproducing
G11B 11/105 2006.01
GPHYSICS
11INFORMATION STORAGE
BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
11Recording on, or reproducing from, the same record carrier wherein for these two operations the methods or means are covered by different main groups of groups G11B3/-G11B7/212; Record carriers therefor
10using recording by magnetisation or demagnetisation
105using a beam of light or a magnetic field for recording and a beam of light for reproducing, e.g. light-induced thermo-magnetic recording, Kerr effect reproducing
G11B 20/14 2006.01
GPHYSICS
11INFORMATION STORAGE
BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
20Signal processing not specific to the method of recording or reproducing; Circuits therefor
10Digital recording or reproducing
14using self-clocking codes
H03L 7/14 2006.01
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
LAUTOMATIC CONTROL, STARTING, SYNCHRONISATION, OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
7Automatic control of frequency or phase; Synchronisation
06using a reference signal applied to a frequency- or phase-locked loop
08Details of the phase-locked loop
14for assuring constant frequency when supply or correction voltages fail
CPC
G11B 11/10506
GPHYSICS
11INFORMATION STORAGE
BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
11Recording 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
10using 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
105using 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 thermo-magnetic recording, ; spin magnetisation recording,; Kerr ; or Faraday; effect reproducing
10502characterised by the transducing operation to be executed
10504Recording
10506by modulating only the light beam of the transducer
G11B 11/10515
GPHYSICS
11INFORMATION STORAGE
BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
11Recording 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
10using 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
105using 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 thermo-magnetic recording, ; spin magnetisation recording,; Kerr ; or Faraday; effect reproducing
10502characterised by the transducing operation to be executed
10515Reproducing
G11B 11/10595
GPHYSICS
11INFORMATION STORAGE
BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
11Recording 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
10using 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
105using 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 thermo-magnetic recording, ; spin magnetisation recording,; Kerr ; or Faraday; effect reproducing
10595Control of operating function
G11B 20/1403
GPHYSICS
11INFORMATION STORAGE
BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
20Signal processing not specific to the method of recording or reproducing; Circuits therefor
10Digital recording or reproducing
14using self-clocking codes
1403characterised by the use of two levels
G11B 7/0045
GPHYSICS
11INFORMATION STORAGE
BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
7Recording 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;
004Recording, reproducing or erasing methods; Read, write or erase circuits therefor
0045Recording
G11B 7/005
GPHYSICS
11INFORMATION STORAGE
BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
7Recording 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;
004Recording, reproducing or erasing methods; Read, write or erase circuits therefor
005Reproducing
Applicants
  • KONINKLIJKE PHILIPS ELECTRONICS N.V. [NL/NL]; Groenewoudseweg 1 NL-5621 BA Eindhoven, NL
Inventors
  • IMMINK, Albert, H., J.; NL
  • DIJKMANS, Eise, C.; NL
  • VAN DEN HOMBERG, Johannes, A., T., M.; NL
Agents
  • DE JONG, Durk, Jan; Internationaal Octrooibureau B.V. Prof. Holstlaan 6 NL-5656 AA Eindhoven, NL
Priority Data
98204431.524.12.1998EP
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) PHASE-LOCKED LOOP AND DEVICE FOR READING AND/OR WRITING INFORMATION FROM/ONTO A RECORD CARRIER
(FR) BOUCLE A PHASE ASSERVIE ET DISPOSITIF DE LECTURE ET/OU D'ECRITURE DE DONNEES DANS UN SUPPORT D'ENREGISTREMENT
Abstract
(EN)
A phase-locked loop comprising: a controllable oscillator (1) for supplying an output signal (So) having a frequency which is dependent on a control signal (Sc), feedback means (2) for supplying a feedback signal (Sh) having a frequency which is proportional to the frequency of the output signal (So), first error signal-generating means (3) for generating a first error signal (Se) which is a measure of an average difference in phase between the feedback signal (Se) and a reference signal (Sref), second error signal-generating means (4) for receiving the first error signal (Se) and generating a second error signal (Sa), comprising A/D conversion means (4a) for converting the first error signal (Se) into a digital signal (Sd), digital memory means (4b) for memorizing the digital signal (Sd), and D/A conversion means (4c) for converting the digital signal (Sd) into the second error signal (Sa). The phase-locked loop has a first operational state in which the digital signal (Sd) memorized in the digital memory means is dependent on the reference signal (Sref), and a second operational state in which the digital signal (Sd) is independent of the reference signal (Sref). In addition, the phase-locked loop comprises switching means (9) for selecting the control signal (Sc) from the first error signal (Se) and the second error signal (Sa). In the first operational state, the first error signal (Se) is the control signal (Sc), and in the second operational state, the second error signal (Sa) is the control signal (Sc).
(FR)
Cette boucle à phase asservie comprend un oscillateur (1) pouvant être commandé et servant à fournir un signal de sortie (So) dont la fréquence est tributaire d'un signal de commande (Sc), un système de rétroaction (2) fournissant un signal de rétroaction (Sh) d'une fréquence proportionnelle à celle du signal de sortie (So), un premier générateur de signal d'erreur (3) produisant un premier signal d'erreur (Se) qui est une mesure de la différence moyenne de phase entre le signal de rétroaction (Se) et un signal de référence (Sref), un second générateur de signal d'erreur (4) recevant le premier signal d'erreur (Se) et produisant un second signal d'erreur (Sa), ce second générateur comprenant un convertisseur analogique/numérique (4a) convertissant le premier signal d'erreur (Se) en signal numérique (Sd), une mémoire numérique (4b) mémorisant le signal numérique (Sd) et un convertisseur numérique/analogique (4c) convertissant le signal numérique (Sd) en second signal d'erreur (Sa). Cette boucle à phase asservie possède un premier état de fonctionnement dans lequel le signal numérique (Sd) mémorisé dans la mémoire numérique dépend du signal de référence (Sref) et un second état de fonctionnement dans lequel le signal numérique (Sd) ne dépend pas du signal de référence (Sref). La boucle à phase asservie comprend également un dispositif de commutation (9) sélectionnant le signal de commande (Sc) à partir du premier (Se) et du second (Sa) signal d'erreur. Dans le premier état de fonctionnement, le premier signal d'erreur (Se) est le signal de commande (Sc) tandis que dans le second état, c'est le second signal d'erreur (Sa) qui est le signal de commande (Sc).
Latest bibliographic data on file with the International Bureau