ADPCM

from The Free On-line Dictionary of Computing (8 July 2008)

Adaptive Digital Pulse Code Modulation
ADPCM

   <communications> (ADPCM) A {compression} technique which
   records only the difference between samples and adjusts the
   coding scale dynamically to accomodate large and small
   differences.  ADPCM is simple to implement, but introduces
   much {noise}.

   [Used where?  Does the {Sony} minidisk use ADPCM or {ATRAC}?]

   (1998-12-10)