Variable-length coding/decoding device

Details Variable-length coding/decoding device Variable-length coding/decoding device

1989-02-22

1991-01-15

Shoop, Jr., William M.

Coded data generation or conversion

Digital code to digital code converters

To or from run length limited codes

341 50, 341 51, 341 58, 341 67, H03M 700

Patent

active

049857002

ABSTRACT:
In a variable-length coding/decoding device, an r.multidot.m-bit data word is converted into an r.multidot.n-bit code word, where r is an integer having the relationship 1.ltoreq.r.ltoreq.r.sub.max, a basic data word length consists of a m bits (m is a positive integer), and a basic code word length consists of n bits (n is a positive integer), and each of data words of a variable-length run-length-limited code limiting the run number of bits of a first value (e.g., "o") between successive bits of a second value (e.g., "1") in a binary-coded bit string generated by concatenation of code words after the conversion to a value no smaller than d and no larger than k into a code word corresponding to thereto. At that time, an input data word is once coded into an r.sub.max .multidot.q-bit (q is a positive integer) code word, and then divided into r.sub.max blocks each consisting of q bits, and a code word in each of the blocks is coded to obtain a variable-length run-length-limited code word. Also, the variable-length run-length-limited code word is inverted into a data word corresponding thereto. At that time, the input code word is divided into r.sub.max blocks each consisting of n bits, and a code word in each of the blocks is once decoded into a q-bit (q is a positive integer) code word. Then, the r.sub.max .multidot.q-bit code word is decoded to obtain a data word.

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patent: 4760378 (1988-07-01), Iketani et al.
patent: 4833470 (1989-05-01), Iketani
patent: 4833471 (1989-05-01), Tokuume et al.

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