LTAC - Lossless Transform Audio Compression - was the first lossless codec developed by Tilman Liebchen while studying at Technische Universität Berlin.

The LTAC webpage is mirrored at the Internet Archive.

Compression performance in my limited test: 56,2% (setting 4096)


Date: 1998-10-05
Version: 1.71
Interface: Graphical
Platform: Win32
Download: ltac98.zip - 109kB

Date: 1998-06-25
Version: 1.61
Interface: Command line
Platform: DOS
Download: ltac.zip - 42kB

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After a while, the developer abandoned LTAC to focus on the development of LPAC - Lossless Predictive Audio Compression - based on linear prediction, increasing compression and making it faster compared to LTAC, which is based on transform coding.

Finally, LPAC was selected as the basis of the MPEG4 lossless audio standardization effort. After further improvements submitted by Real Networks and NTT, the format was standardized as MPEG4 ALS and at that time LPAC too was frozen, with no further development planned.

The LPAC webpage is also mirrored at the Internet Archive.

Compression performance in my limited test: 53,08% (setting 5)


Date: 2002-08-02
Version: 1.41 (codec 3.08)
Interface: Graphical + Command line + API
Platform: Win32
Download: lpacfull.zip - 221kB

Date: 2002-08-02
Version: 1.40 (codec 3.08)
Interface: Command line
Platform: Linux
Download: lpac_s.tar.gz - 197kB

Date: ?
Version: 1.00
Interface: Winamp plugin
Platform: Win32
Download: in_lpac.exe - 47kB