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1. (WO1998031015) METHOD AND APPARATUS FOR WRITING A CLOCK TRACK ON A STORAGE MEDIUM
Latest bibliographic data on file with the International Bureau   

Pub. No.: WO/1998/031015 International Application No.: PCT/GB1998/000012
Publication Date: 16.07.1998 International Filing Date: 05.01.1998
Chapter 2 Demand Filed: 28.07.1998
IPC:
G11B 5/55 (2006.01) ,G11B 5/596 (2006.01) ,G11B 20/16 (2006.01) ,G11B 21/08 (2006.01) ,G11B 27/30 (2006.01)
G PHYSICS
11
INFORMATION STORAGE
B
INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
5
Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
48
Disposition or mounting of heads relative to record carriers
54
with provision for moving the head into, or out of, its operative position or across tracks
55
Track change, selection, or acquisition by displacement of the head
G PHYSICS
11
INFORMATION STORAGE
B
INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
5
Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
48
Disposition or mounting of heads relative to record carriers
58
with 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
596
for track following on discs
G PHYSICS
11
INFORMATION STORAGE
B
INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
20
Signal processing not specific to the method of recording or reproducing; Circuits therefor
10
Digital recording or reproducing
16
using non self-clocking codes, i.e. the clock signals being either recorded in a separate clocking track or in a combination of several information tracks
G PHYSICS
11
INFORMATION STORAGE
B
INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
21
Head arrangements not specific to the method of recording or reproducing
02
Driving or moving of heads
08
Track changing or selecting
G PHYSICS
11
INFORMATION STORAGE
B
INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
27
Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
10
Indexing; Addressing; Timing or synchronising; Measuring tape travel
19
by using information detectable on the record carrier
28
by using information signals recorded by the same method as the main recording
30
on the same track as the main recording
Applicants: LEONARD, Anthony, William[GB/GB]; GB (UsOnly)
HAVANT INTERNATIONAL LIMITED[GB/GB]; Langstone Road Havant Hampshire PO9 1SA, GB (AllExceptUS)
Inventors: LEONARD, Anthony, William; GB
Agent: FLINT, Adam; W.H. Beck, Greener & Co. 7 Stone Buildings Lincoln's Inn London WC2A 3SZ, GB
Priority Data:
9700117.606.01.1997GB
Title (EN) METHOD AND APPARATUS FOR WRITING A CLOCK TRACK ON A STORAGE MEDIUM
(FR) PROCEDE ET APPAREIL POUR ECRIRE DES DONNEES D'HORLOGE SUR UN SUPPORT DE DONNEES
Abstract:
(EN) A method and apparatus for writing clock data to a storage medium, such as a disk, is disclosed. The storage medium has tracks on which data are stored. Clock data is written to a present track on the storage medium. The written clock data is read from said present track. Clock data for a subsequent track on the storage medium is generated from the clock data read from said present track. The phase of the generated clock data for the subsequent track is compared with a reference timing signal and the phase of the generated clock data for the subsequent track is adjusted in accordance with said comparison. Said phase adjusted clock data for the subsequent track is written to said subsequent track. Phase errors can be significantly reduced and, for practical purposes, substantially eliminated. It is not necessary to provide a dedicated clock read/write head.
(FR) La présente invention concerne un procédé et un appareil destinés à des données d'horloge sur un support de données tel qu'un disque. Le support de données comporte des pistes sur lesquelles on stocke les données. Les données d'horloge sont écrites sur une piste courante du support de données. Les données d'horloge sont lues depuis ladite piste courante. Les données d'horloge destinées à une piste subséquente sur le support de données sont générées à partir des données d'horloge lues sur la piste courante. La phase des données d'horloge générée et associée à la piste subséquente est comparée à un signal de rythme de référence, et ladite phase est corrigée en fonction de cette comparaison. Lesdites données d'horloges à phase corrigée associée à la piste subséquente sont écrites sur la piste subséquente. Les erreurs de phase peuvent être réduites de manière significative ou sensiblement supprimées pour des raisons pratiques. Il n'est pas nécessaire de disposer d'une tête spécialisée de lecture/d'écriture de signaux d'horloge.
front page image
Designated States: CN, JP, SG, US
European Patent Office (EPO) (AT, BE, CH, DE, DK, ES, FI, FR, GB, GR, IE, IT, LU, MC, NL, PT, SE)
Publication Language: English (EN)
Filing Language: English (EN)