Appeal No. 1998-2497
Application No. 08/472,275
The invention is directed to improvements in digital
signal recording apparatus for converting successively
supplied n-bit information words into a serial stream of bits
for recording on a magnetic recording medium.
Representative independent claim 1 is reproduced as
follows:
1. Digital signal recording apparatus comprising:
a recorder, for recording parallel tracks of digital
signal modulation on a recording medium;
an input port for serially receiving n-bit information
words;
circuitry for inserting a “0" bit into each said received
n-bit information word and generating a (n+1)-parallel-bit
“positive” information word at an information word rate slower
by a factor of (n+1) than the rate of a system clock;
circuitry for inserting a “1" bit into each said received
n-bit information word and generating a (n+1)-parallel-bit
“negative” information word at said information word rate,
which (n+1)-parallel-bit “negative” information word is
supplied concurrently with said (n+1)-parallel-bit “positive”
information word generated from the same one of said n-bit
information words;
a first precoder for coding each (n+1)-parallel-bit
“positive” information word to convert it into a corresponding
“positive”-information (n+1)-parallel-bit channel word,
generated at a channel word rate slower by a factor of (n+1)
than the rate of said system clock;
2–
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