Lossless compression of one-bit audio
Erwin Janssen, Eric Knapen, Derk Reefman, Fons Bruekers · 2004
The paper introduces the coding technique that is used by the Super Audio CD system for lossless compression of 64 times oversampled one-bit audio data. The technique has been coined DST (direct stream transfer). The individual steps in the encoding and decoding process are detailed. The performance of the lossless compression algorithm, as a function of various music genres, is discussed. It is shown that 74 minutes of both stereo and multi-channel music, which translates to 12.5 GB of raw data, fit on the 4.7 GB Super Audio disc after compression. An extension to the algorithm for future professional use of higher sampling rates is made. The lossless compression performance is demonstrated with wide-band 256 Fs recordings, and 128 and 64 Fs down converted versions of these, demonstrating the scalability of the algorithm.