High density bias linearized magnetic recording system...

Details High density bias linearized magnetic recording system... High density bias linearized magnetic recording system...

G - Physics

11

B

352/20.6

G11B 5/09 (2006.01) G11B 20/14 (2006.01)

Patent

CA 1134943

HIGH DENSITY BIAS LINEARIZED MAGNETIC RECORDING SYSTEM UTILIZING NYQUIST BANDWIDTH PARTIAL RESPONSE TRANSMISSION ABSTRACT OF THE DISCLOSURE A digital magnetic recording system is disclosed that utilizes partial response signalling to achieve the Nyquist data pulse rate with minimum bandwidth. A. C. bias is introduced to linearize the magnetic medium which, inter alia, permits reliable multilevel (greater than 2) data storage without impairing data accessibility. Pre- ferably Class IV partial response is utilized with one or more sinusoidal lobes in the data frequency spectrum. The basic binary data to be stored is converted to, for example, ternary and the ternary data is precoded. The precoded ternary data is recorded on the magnetic medium via an interleaved dipulse sequence having a spectral null slightly outside the data frequency band. A pilot tone is inserted at the spectral null for timing recovery and automatic gain control.

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