mpeg-4 aac ssr

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

MPEG-4 Advanced Audio Coding Scalable Sampling Rate
MPEG-4 AAC SSR

   <compression, standard, algorithm> (MPEG-4 AAC SSR) An {AAC}
   flavour supporting different qualities for different targets.
   One stream can contain up to 3 streams for 11.025 kHz (Stream
   1), 22.05 (Stream 1 and 2) and 44.1 kHz (all 3 Streams)
   sampling frequency.  Quality is between Low Profile and Main
   profile.  See also {JPEG-2000}.

   (2001-12-09)