Dynamic magnetic information storage or retrieval – Monitoring or testing the progress of recording
Patent
1991-07-01
1993-07-27
Nelms, David C.
Dynamic magnetic information storage or retrieval
Monitoring or testing the progress of recording
360 7308, H04N 578
Patent
active
052315436
ABSTRACT:
Digital signal recording and reproducing apparatus for recording digital signals in successive tracks of given pitch on a record medium and for reproducing digital signals therefrom. A rotary head assembly including two pairs of head subassemblies angularly separated by approximately 180.degree., with each subassembly comprised of a pair of heads displaced from each other in a direction parallel to the track pitch, is driven at a predetermined rotation speed to record digital signals selectively supplied at respectively different original transmission rates which exhibit a predetermined ratio. The digital signals are timebase modified to have substantially the same data rate even though their original transmission rates differ from each other; and are coupled to the rotary head assembly. The record medium is driven during a recording mode at respectively different speeds determined by the original transmission rate of the selectively supplied digital signal, whereby the number of tracks recorded on the record medium during a unit time period T (where T is the time for the rotary head assembly to make a predetermined number of rotations) corresponds to the original transmission rate. The record medium is driven during a reproducing mode at the same speed as was used during recording, whereby during the time period T the rotary head assembly reproduces digital signals from twice the number of tracks that had been recorded during that same time period . The reproduced digital signals are recovered substantially without defects at their original transmission rate by way of a memory.
REFERENCES:
patent: 4617599 (1986-10-01), Noguchi et al.
patent: 4791507 (1988-12-01), Doyama et al.
patent: 4796128 (1989-01-01), Takimoto
Kanota Keiji
Kubota Yukio
Frommer William S.
Nelms David C.
Sinderbrand Alvin
Sony Corporation
Ue Que T.
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