Tandberg Data As

Herman Lia

Erik Solhjell

To improve recording of data on a magnetic recording medium such as a magnetic tape, amplitudes of write signals supplied to a magnetic head are modified, dependent on distances between edges of the write signals. The modification occurs such that, given a short spacing, a respective write signal has a greater value than given a large spacing. Amplitudes of the write signals are modified in three steps when the GCR method is employed as a writing method for recording the data, distances of the edges of the write signals being capable of assuming three different values.

Method and arrangement for recording data on a magnetic recording medium

High-frequency magnetic bias signals are superimposed on the data signals and are synchronized with the data signals. For the data signals and for the magnetic bias signals in each instance a separate write amplifier with two logic elements is provided which are alternately switched in dependence upon the binary values of the data signals and the magnetic bias signals, respectively. Mutually corresponding logic elements in the write amplifiers are interconnected at the output side via resistances. The magnetic head is connected between the connection points of the resistances. The resistances determine the respective current through the magnetic head. As logic elements preferably integrated NAND circuits without output-side collector resistances are provided.

Circuit arrangement for the recording of data on a magnetic recording

Encoded digital information signals are magnetically recorded on a magnetic recording medium with the assistance of a magnetic head to which write current is supplied. As a function of the encoded information signals, a head change is carried out wherein the current applied to the magnetic head is changed from a first current value to a second current value and vice versa. After each head change, an amplitude of the write current is varied in stepwise amounts from the first or second current value, respectively, and wherein the number of steps depends on a chronological spacing of the head changes from one another. Distortions of resulting read signals are reduced given the method and apparatus of the invention.

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Li, Norway

Herman Lia