Appeal No. 1998-2497
Application No. 08/472,275
a second precoder for coding each (n+1)-parallel-bit
“negative” information word to convert it into a corresponding
“negative”-information (n+1)-parallel-bit channel word,
generated at said channel word rate;
means for selecting one of each concurrent pair of
“positive”-information and “negative”-information (n+1)-
parallel-bit channel words for serial recording at said system
clock rate, said means for selecting one of each concurrent
pair of (n+1)-parallel-bit channel words for recording
including
first parallel-to-serial conversion means for generating
first parallel-to-serial conversion results by converting the
selected (n+1)-parallel-bit channel word to serial-bit form,
and
a selector switch responsive to a control signal for
selecting one of said first parallel-to-serial conversion
results for application to said recorder, for serial recording
at said system clock rate;
second parallel-to-serial conversion means for generating
second parallel-to-serial conversion results by converting at
least one of each concurrent pair of (n+1)-parallel-bit
channel words to serial-bit form; and
a control signal generator for selecting a prescribed
spectral response for the one of the parallel tracks on said
magnetic recording medium being currently recorded, for
determining from said second parallel-to-serial conversion
results how much respective spectral responses for “positive”-
information and “negative”-information (n+1)-parallel-bit
channel words most recently generated by said first and second
precoders will deviate in energy from said prescribed spectral
response if recorded in a prescribed non-return-to-zero-
invert-on-ONEs format, and for comparing the amplitudes of the
respective deviation results for the “positive”-information
and”negative”-information (n+1)-parallel-bit channel words
most recently generated by said first and second precoders, to
generate a control signal indicating which one of said
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