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1. (WO1991007751) METHOD AND APPARATUS FOR SYNCHRONIZING TIMING SIGNALS FOR HELICAL SCAN RECORDER
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/1991/007751 International Application No.: PCT/US1990/006323
Publication Date: 30.05.1991 International Filing Date: 06.11.1990
Chapter 2 Demand Filed: 08.05.1991
IPC:
G11B 20/10 (2006.01) ,G11B 20/12 (2006.01) ,G11B 27/10 (2006.01) ,G11B 27/30 (2006.01)
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
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
12
Formatting, e.g. arrangement of data block or words on the record carriers
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
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:
EXABYTE CORPORATION [US/US]; 1745 38th Street Boulder, CO 80301, US
Inventors:
HUGHES, Timothy, C.; US
GEORGIS, Steven, Philip; US
Agent:
BURNAM, H., Warren, Jr. ; Griffin, Branigan & Butler Post Office Box 2326 Arlington, VA 22202, US
Priority Data:
434,00809.11.1989US
Title (EN) METHOD AND APPARATUS FOR SYNCHRONIZING TIMING SIGNALS FOR HELICAL SCAN RECORDER
(FR) PROCEDE ET APPAREIL DE SYNCHRONISATION DE SIGNAUX DE SYNCHRONISATION POUR ENREGISTREURS A BALAYAGE HELICOIDAL
Abstract:
(EN) Method and apparatus are provided for developing a digital timing signal (HEAD SYNC) indicative of when a head (R1) of a helical scan recorder (30) is positioned over a recorded stripe on magnetic tape (32). The method involves rotating a drum (36) upon which a head (R1) is mounted while the magnetic tape (32) is transported past the drum (36) at a speed greater than the nominal speed at which stripes were recorded on the tape (32). Given the geometry of the system and format of the tape (32), the head (R1) is eventually able to recognize a pattern of digital data. The timing of the recognition of the pattern of digital data is used to determine the precise time, relative to each rotation of the drum (36), that the head (R1) ceases to traverse a stripe and the precise time during each rotation of the drum that the head (R1) begins to traverse a stripe. The determination of the edges of the digital timing signal (HEAD SYNC) is repeated upon every rotation of the drum (36). A servo timing signal (SERVO SYNC) for a servo head (S) (also mounted on the drum (36)) is generated in ninty (90) degree phase relationship to the digital timing signal (HEAD SYNC).
(FR) Un procédé et un appareil servent à développer un signal numérique de synchronisation (HEAD SYNC) qui indique le moment où la tête (R1) d'un enregistreur (30) à balayage hélicoïdal est positionnée sur une piste enregistrée d'une bande magnétique (32). Le procédé implique la mise en rotation d'un tambour (36) sur lequel est montée une tête (R1) alors que la bande magnétique (32) est transportée devant le tambour (36) à une vitesse supérieure à la vitesse nominale d'enregistrement des pistes sur la bande (32). Etant donnée la géométrie du système et le format de la bande (32), la tête (R1) finit par reconnaître une configuration de données numériques. La synchronisation de la reconnaissance de la configuration de données numériques est utilisée afin de déterminer le moment précis, par rapport à chaque rotation du tambour (36), où la tête (R1) cesse de traverser une piste et le moment précis lors de chaque rotation du tambour où la tête (R1) commence à traverser une piste. La détermination des bords du signal numérique de synchronisation (HEAD SYNC) se répète lors de chaque rotation du tambour (36). Un signal de servo-synchronisation (SERVO SYNC) d'une tête asservie (S), également montée sur le tambour (36), est généré avec une relation de phase de quatre-vingt-dix (90) degrés par rapport au signal numérique de synchronisation (HEAD SYNC).
Designated States: AU, CA, JP
European Patent Office (AT, BE, CH, DE, DK, ES, FR, GB, GR, IT, LU, NL, SE)
Publication Language: English (EN)
Filing Language: English (EN)
Also published as:
EP0502029CA2066177AU1990067427