Direct stream transfer

from Wikipedia, the free encyclopedia

Direct Stream Transfer is a lossless data compression method developed by Philips for electronic data processing of digital data . It is described in Part 3 of the MPEG-4 standard, ISO / IEC 14496-3.

It is used in the Super Audio CD (SACD) propagated by Sony and Philips . It is used to compress the individual data streams ( Direct Stream Digital ) of the SACD without loss and thus to save space on the SACD. In contrast to the lossy compression methods (for example MP3 , AAC , Ogg Vorbis ), the original data stream can be restored unaltered.

This coding is frame-based so that random access can continue to exist with the SACD. Methods such as adaptive prediction and entropy coding are used.

DST achieves a compression rate of up to 50%, which is a very good value for lossless compression of audio data.

Other lossless audio data compressors are, for example, Windows Media Audio 9 Lossless or in DVD-Audio used Meridian Lossless Packing / Dolby TrueHD , which in DVD + Audio used royalty-free open-source alternative WavPack and Apple Lossless or open source codec FLAC .

literature

  • Thomas Görne: Sound engineering. Fachbuchverlag Leipzig in Carl Hanser Verlag, Munich et al. 2006, ISBN 3-446-40198-9 .