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Lossless Multichannel Audio Coding

Project Data
Project Manager
Prof. Dr.-Ing. Peter Noll
Founded by
Project Period
until 03/2006



Lossless audio coding enables the compression of digital audio data without any loss in quality due to a perfect reconstruction of the original signal. Principal applications are transmission and archiving systems, in particular for professional use in broadcasting and sound engineering. The objective of the project is to extend former studies on lossless audio coding by developing methods for joint coding of stereo and multichannel signals. While conventional algorithms only remove intra-channel correlations, it is worthwhile to make use of inter-channel correlations as well. Therefore, a main goal of the project is the development of a efficient lossless multichannel codec.


  • Elaboration of a universal model which describes the dependencies between the channels of stereo and multichannel audio signals.
  • Development of a joint stereo lossless codec which achieves an average bit rate reduction of 1 bit/sample compared to independent coding.
  • Extension of that codec to handle multichannel / surround material with up to 24 bit / 192 kHz.


LPAC (Lossless Predictive Audio Compression) - Lossless Codec for Windows und Linux

MPEG Standardization
Two modified versions of the LPAC algorithm were submitted in the "Call for Proposals on MPEG-4 Lossless Audio Coding". At the 64th MPEG meeting in March 2003, the "lossless-only" version was chosen as reference model for "MPEG-4 Audio Lossless Coding". More information can be found at the page on MPEG-4 Audio Lossless Coding (ALS).

Prof. Dr.-Ing. Peter Noll

Dipl.-Ing. Tilman Liebchen

Tunc Kilicarslan

Zusatzinformationen / Extras