资料来源 : Free On-Line Dictionary of Computing

MPEG-4 Advanced Audio Coding Scalable Sampling Rate
     
         (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)