Modulating method, demodulating method, modulating apparatus, an

Details Modulating method, demodulating method, modulating apparatus, an Modulating method, demodulating method, modulating apparatus, an

1994-03-15

1996-06-18

Pellinen, A. D.

Coded data generation or conversion

Digital code to digital code converters

To or from run length limited codes

341106, H03M 746

Patent

active

055282369

ABSTRACT:
A modulating system for converting data of a basic data length of m bits into a variable length code (d, k; m, n; r) of a basic code length of n bits, which comprises the steps of: judging a binding length i (i=1.about.r) of the basic data; uniformly converting data of m.times.i bits into a code of n.times.r bits by using a conversion table for converting data of m.times.r bits where the binding length i is the maximum binding length r, and including at least one conversion table where the binding length i is less than r; and taking out specific bits from the code of n.times.r bits thus obtained on the basis of the judged binding length i to output them as a modulation code. There is also a demodulating system for converting, in reverse direction, a variable length code (d, k; m, n; r) of a basic code length of n bits into data of a basic data length of m bits, comprising the steps of: judging a binding length i of the variable length code; uniformly converting, in reverse direction, a variable length code of n.times.i bits into data of m.times.r bits by a reverse conversion table for converting, in reverse direction, a variable length code of n.times.r bits where the binding length i is the maximum binding length r, and including at least one reverse conversion table where the binding length i is less than r; and taking out specific bits from data thus obtained on the basis of the judged binding length i to output it as reproduction data.

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