Lossless Predictive Audio Compression (LPAC) is an improved lossless audio compression algorithm developed by Tilman Liebchen, Marcus Purat and Peter Noll at Institute for Telecommunications (http://www.nue.tu-berlin.de/index_e.html), Technical University Berlin (TU Berlin), to compress PCM audio in a lossless manner, unlike conventional audio compression algorithms which are lossy.
See also: Lossless Transform Audio Compression (LTAC), True Audio - Free Lossless Codec (TTA), Free Lossless Audio Codec (FLAC)