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Other variable unit codes

  • Instead of bytes, we can also use a different “unit of alignment”: 32 bits (words), 16 bits, 4 bits (nibbles).

  • Variable byte alignment wastes space if you have many small gaps – nibbles do better in such cases.

  • Variable byte codes:

    • Used by many commercial/research systems

    • Good low-tech blend of variable-length coding and sensitivity to computer memory alignment matches (vs. bit-level codes, which we look at next).

  • There is also recent work on word-aligned codes that pack a variable number of gaps into one word


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