Appeal No. 1999-2705
Application 08/686,756
The invention solves this problem by measuring the
magnetizing current required for operating each recording head
at an optimum value. The value of the magnetizing current is
stored in a nonvolatile memory separate from the magnetic
tape. During the recording process, each recording head is
supplied with a magnetizing current corresponding to the
stored value of magnetizing current corresponding to that
particular head, so that each head operates in an optimum
range.
Claim 1 is reproduced below.
1. Process for the recording of digital signals on
a magnetic tape in multiple longitudinal tracks by means
of recording heads which are arranged in a matrix and are
supplied with current row-wise and column-wise in
dependence on the digital signals in a multiplex
operation wherein the magnetic field resulting
exclusively from row or column currents in the recording
heads supplied with current in each case lies below the
coercive field strength of the magnetic tape, while the
magnetic field resulting from row and column currents
superposed in the same sense in the respectively selected
recording heads supplied with current lies above the
coercive field strength of the magnetic tape and produces
magnetized domains, wherein for each recording head a
value determined in preliminary tests for the magnetizing
current from row and column currents superposed in the
same sense, for maintaining a desired operating point, is
permanently stored in a non-volatile memory separate from
the magnetic tape and, on selection, the recording heads
are supplied with the stored values of the magnetizing
current assigned to them.
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