Dynamic magnetic information storage or retrieval – Recording for changing duration – frequency or redundant...
Patent
1981-11-20
1984-07-03
Canney, Vincent P.
Dynamic magnetic information storage or retrieval
Recording for changing duration, frequency or redundant...
360 51, G11B 500, G11B 509
Patent
active
044582722
ABSTRACT:
To store digital data on a magnetic tape at a bit rate which does not exceed the storage capabilities of the tape of about 80 Mbit/s, although received digital video signals have a bit rate of about 200 Mbit/s, the video signals are split into two channels and applied to a head wheel having four transducer heads, and the bits are applied to the transducer heads in time-expanded form, with the wrap angle of the tape exceeding 180.degree., time expansion being carried out at a rate related to the excess wrap angle, so that the track of recording will have a smaller recording angle (.beta.2) than heretofore (.beta.1), the time-expanded signals being recompressed upon reproduction. Time compression and expansion is preferably carried out by buffer memories which have data entered and read-out in the FIFO method, at respectively different clock rates, switched under control of a control unit (26) which receives head wheel position input signal information.
REFERENCES:
patent: 3860760 (1975-01-01), Rittenbach
patent: 4141039 (1979-02-01), Yamamoto
patent: 4318137 (1982-03-01), Cordova et al.
Canney Vincent P.
Robert & Bosch GmbH
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