Dynamic magnetic information storage or retrieval – General processing of a digital signal – Data in specific format
Patent
1989-05-01
1995-05-02
Psitos, Aristotelis
Dynamic magnetic information storage or retrieval
General processing of a digital signal
Data in specific format
360 64, G11B 509, G11B 1514
Patent
active
054125154
ABSTRACT:
An apparatus for recording an electric signal (A) on a magnetic record carrier (1) includes at least one pair of write heads (K.sub.1, K.sub.2) having a mechanically rigid coupling to each other and arranged on a head drum (40). The record carrier (1) is wrapped around the head drum through a wrapping angle .alpha.. The pair of heads (K.sub.1, K.sub.2) writes pairs of tracks (T.sub.1, T.sub.2 ; T.sub.3, T.sub.4 ; . . . ) on the record carrier. The apparatus further includes a signal separator (4) for dividing the electric signal into consecutive blocks, after which the signal blocks having odd sequence number (B.sub.1, B.sub.3, . . . ) are applied to a first output (5) and the signal blocks having even sequence number (B.sub.2, B.sub.4 . . . ) are applied to a second output (6). In a time-base correction circuit (7) the signal blocks (A.sub.1, A.sub.2) are time expanded or compressed. .alpha. Differs from 180.degree. . Signal blocks having odd sequence numbers are delayed in time relative to signal blocks having even sequence numbers (16). Subsequently, the signal blocks thus processed are recorded. Time compression or expansion is effected by a factor of .alpha.*n/(180*(M+1), where n is the number of head pairs and M is the number of times within a specific time interval that a head pair which comes in contact with a record carrier during said time interval does not record a signal in the record carrier, this time interval being defined by those instants at which two consecutive track pairs are recorded by one or two head pairs.
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patent: 4542417 (1985-09-01), Ohta
patent: 4757392 (1988-07-01), Awamoto et al.
patent: 4922359 (1990-05-01), Nakamura
"An Experimental Digital Video Recording System", Driessen et al., IEEE vol. (E-32, No. 3, Aug. 1986 pp. 362-369.
Rijckaert Albert M. A.
van der Kop Joannes A. E.
Goodman Edward W.
Kim Won-Tae C.
Psitos Aristotelis
U.S. Philips Corporation
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