Dynamic magnetic information storage or retrieval – Record transport with head stationary during transducing – Tape record
Patent
1978-04-18
1980-09-09
Wolff, John H.
Dynamic magnetic information storage or retrieval
Record transport with head stationary during transducing
Tape record
G11B 1568
Patent
active
042220831
ABSTRACT:
The apparatus is adapted to simultaneously treating a pair of magnetic tape cassettes. The apparatus comprises two pairs of hubs, which cooperate with the reels of the magnetic tapes, and which can rotate in both directions at a substantially constant angular speed under the control of a single electric motor. A pair of magnetic heads are employed for writing and/or reading binary information on the two tapes. The data read by the heads are regarded as information only if they exceed a predetermined threshold value defined by a voltage generator. A control circuit, comprising a variable gain amplifier, maintains the ratio between the peak of the data detected and the value of the threshold substantially constant, taking into account the variations of the linear speed of the tapes.
REFERENCES:
patent: Re29733 (1978-08-01), Darwood
patent: 3317212 (1967-05-01), Tatter
patent: 3560666 (1971-02-01), Bookman
patent: 3620476 (1971-11-01), Cervantes
patent: 4029269 (1977-06-01), Clarridge
patent: 4114834 (1978-09-01), Haake
Raccanelli Mirco
Romano Carlo
Tronzano Sergio
Ing. C. Olivetti & C. S.p.A.
Wolff John H.
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