Rotary transformer with winding to cancel crosstalk

Details Rotary transformer with winding to cancel crosstalk Rotary transformer with winding to cancel crosstalk

1988-07-08

1989-05-02

Faber, Alan

Dynamic magnetic information storage or retrieval

General recording or reproducing

Signal switching

360124, 360 66, G11B 517, G11B 1514

Patent

active

048273600

ABSTRACT:
A magnetic recording/reproducing apparatus for magnetically recording and reproducing information on and from a magnetic tape. The apparatus includes a rotary drum adapted to be rotatable about its own axis and having at its circumferential portions a plurality of magnetic heads including at least first and second signal recording/recproducing magnetic heads and one signal erasing magnetic head. In order for coupling between the plurality of magnetic heads and a recording/reproducing circuit of this apparatus, further included is a rotary transformer which is provided between the rotary drum and a stationary portion of this apparatus and which includes first and second transformer coil assemblies coupled to the first and second magnetic heads, respectively, and one erasing coil assembly coupled to the erasing magnetic head. The erasing coil assembly is disposed between the first and second transformer coil assemblies to assume a magnetically neutral position with respect thereto. The recording/reproducing circuit is arranged so that the directions of recording currents through the first and second transformer coil assemblies are in reverse relation to each other, whereby induction currents due to magnetic fluxes produced by the recording currents therethrough are cancelled each other in the erasing coil assembly.

REFERENCES:
patent: 3911486 (1975-10-01), Hibbard
patent: 4369476 (1983-01-01), Karsh
patent: 4639805 (1987-01-01), Hirota et al.
R. B. Hennis, "Cross Channel Coupling", IBM TDB, vol. 1, No. 5, Feb. 1959.
John D. Bick, "Crosstalk Cancellation in Multi-Channel Magnetic Recording System", RCA TN No. 398, Jun. 1960.

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