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1. WO1998015956 - CLOCK GENERATING APPARATUS AND DISK DRIVING APPARATUS

Publication Number WO/1998/015956
Publication Date 16.04.1998
International Application No. PCT/JP1997/003616
International Filing Date 08.10.1997
IPC
G11B 5/596 2006.01
GPHYSICS
11INFORMATION STORAGE
BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
5Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
48Disposition or mounting of heads relative to record carriers
58with provision for moving the head for the purpose of maintaining alignment of the head relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
596for track following on disks
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
G11B 27/24 2006.01
GPHYSICS
11INFORMATION STORAGE
BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
27Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
10Indexing; Addressing; Timing or synchronising; Measuring tape travel
19by using information detectable on the record carrier
24by sensing features on the record carrier other than the transducing track
G11B 27/30 2006.01
GPHYSICS
11INFORMATION STORAGE
BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
27Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
10Indexing; Addressing; Timing or synchronising; Measuring tape travel
19by using information detectable on the record carrier
28by using information signals recorded by the same method as the main recording
30on the same track as the main recording
CPC
G11B 20/10037
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
10009Improvement or modification of read or write signals
10037A/D conversion, D/A conversion, sampling, slicing and digital quantisation or adjusting parameters thereof
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 2220/20
GPHYSICS
11INFORMATION STORAGE
BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
2220Record carriers by type
20Disc-shaped record carriers
G11B 27/24
GPHYSICS
11INFORMATION STORAGE
BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
27Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
10Indexing; Addressing; Timing or synchronising; Measuring tape travel
19by using information detectable on the record carrier
24by sensing features on the record carrier other than the transducing track
G11B 27/3027
GPHYSICS
11INFORMATION STORAGE
BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
27Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
10Indexing; Addressing; Timing or synchronising; Measuring tape travel
19by using information detectable on the record carrier
28by using information signals recorded by the same method as the main recording
30on the same track as the main recording
3027used signal is digitally coded
G11B 5/59616
GPHYSICS
11INFORMATION STORAGE
BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
5Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
48Disposition or mounting of heads ; or head supports; relative to record carriers
58with provision for moving the head for the purpose of maintaining alignment of the head relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
596for track following on disks
59605Circuits
59616Synchronisation; Clocking
Applicants
  • SONY CORPORATION [JP]/[JP] (AllExceptUS)
  • YADA, Hiroaki [JP]/[JP] (UsOnly)
Inventors
  • YADA, Hiroaki
Agents
  • YAMAGUCHI, Kunio
Priority Data
8/26758908.10.1996JP
Publication Language Japanese (JA)
Filing Language Japanese (JA)
Designated States
Title
(EN) CLOCK GENERATING APPARATUS AND DISK DRIVING APPARATUS
(FR) GENERATEUR DE SIGNAUX D'HORLOGE ET DISPOSITIF D'ENTRAINEMENT DE DISQUE
Abstract
(EN)
A clock generating apparatus applicable to a sample servo type magnetic disk. A clock pattern regenerative signal z(t) is digitized by an A/D converter (33), and the resultant signal is supplied to a phase comparator (52). The linear coupling of N-pieces of sample values and N-pieces of weighting coefficients is subjected to inner product computation in a computing element (61) to obtain a phase comparison error signal f($g(u)) from a D flip-flop (62). This signal f($g(u)) is analoged in a D/A converter (53), and the resultant signal is supplied as a control signal to VCO (51) via a loop filter (54), the phase of a clock signal CLK from the VCO (51) being controlled to obtain a clock signal CLK synchronous with the regenerative signal z(t). When coefficients the sum of which becomes zero are used as weighting coefficients, a signal f($g(u)) not influenced by DC component on which the regenerative signal z(t) is superposed, can be obtained, and a clock signal CLK synchronized with a high accurancy with the regenerative signal z(t) can be obtained.
(FR)
L'invention porte sur un générateur de signaux d'horloge applicable à un disque magnétique de servoéchantillonnage. Un signal régénérateur de schéma d'horloge z(t) est numérisé par un convertisseur A/N (33), et le signal résultant est dirigé sur un comparateur de phases (52). Le couplage linéaire de N éléments de valeurs échantillons et de N valeurs de coefficients de pondération est soumis à un calcul de produit intérieur dans un calculateur (61) de manière à obtenir un signal d'erreur de comparaison de phases f($g(u)) fourni par une bascule D (62). Ledit signal f($g(u)) est rendu analogique dans un convertisseur N/A et le signal résultant est fourni, comme signal de commande à l'oscillateur à fréquence commandée (51) par l'intermédiaire d'un filtre à boucle (54), la phase du signal d'horloge (CLK) provenant de l'oscillateur à fréquence commandée (51) étant réglée pour obtenir un signal d'horloge (CLK) en synchronisme avec le signal de régénération z(t). Lorsqu'on utilise comme coefficients de pondération des coefficients dont la somme devient nulle, on peut obtenir un signal f($g(u)) non influencé par les composantes c.c. auxquelles le signal de régénération z(t) est superposé, ainsi qu'un signal d'horloge (CLK) synchronisé avec une grande précision avec le signal de régénération z(t).
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