Triplex digital magnetic recording and reproducing system

Details Triplex digital magnetic recording and reproducing system Triplex digital magnetic recording and reproducing system

1983-09-01

1985-10-01

Cardillo, Jr., Raymond F.

Dynamic magnetic information storage or retrieval

General processing of a digital signal

In specific code or form

360 44, 360 57, 360 66, 340347DD, G11B 509, G11B 502

Patent

active

045449619

ABSTRACT:
A quaternary saturated digital magnetic recording system for enhancing information entropy provides an effective bit density increase of 100% or more over the MFM code. In the simplest implementation, groups of two input binary bits are mapped into one data cell, preferably into four combinations of long or short breaks and positive or negative polarity, with the break optionally centralized within the data cell for self-clocking. A system for reproducing the recorded information provides a peak detector, responsive to the recorded signal, coupled to pulse polarity and break width detector circuitry, with an internally synchronized clock, for remapping the recorded data into binary format.

REFERENCES:
patent: 2894796 (1953-11-01), Reynolds
patent: 4190868 (1980-02-01), Moulin
patent: 4470081 (1984-09-01), Chi

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