Rotating read/write system for NRZI data

Details Rotating read/write system for NRZI data Rotating read/write system for NRZI data

1975-03-03

1976-10-19

Canney, Vincent P.

Dynamic magnetic information storage or retrieval

Record transport with head stationary during transducing

Drum record

360 51, G11B 552, G11B 509

Patent

active

039874907

ABSTRACT:
A rotating head magnetic tape unit having a fixed stator and a rotating rotor is disclosed. A plurality of transformers are positioned between the rotor and the stator so as to establish an interface for the transmission of electrical signals. Circuit means is provided on the rotor of the rotating head magnetic unit for reclocking data phase shifted by the transformer interface, for protecting against inadvertent write on a magnetic tape, and for synchronizing the clock with the data in a write driver whereby the clock may be used as A.C. bias for the written signal. An N times data frequency clock signal received on the rotor is divided N/2 to obtain the reclocking signals. With regard to the synchronization between the clock and write driver, the N times data frequency clock on the rotor is synchronized on the write driver with the data to accomplish A.C. bias recording.

REFERENCES:
patent: 3560946 (1971-02-01), Ehalt et al.
patent: 3838453 (1974-09-01), Buslik et al.
patent: 3864739 (1975-02-01), Jackson

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