PCM, or.wav = unencoded audio (large file size)
MP3 = compressed audio (some audio material removed or lossy, small file size)
WMAL = encolded audio (no audio material removed, but compressed like a zip, or RAR file, lossless when decoded by player, medium file aize)
LPCM = unencoded discrete 5.1/7.1 audio (full size file)
DD 5.1, DTS = lossy compressed LPCM, some audio material removed (small audio file)
DD True HD, DTS HD Master Audio = encoded LPCM (no audio material removed, but compressed like zip or RAR file, lossless when decoded by player or processor).
Anywho, that's the way I understand the compression/encoding schemes.
Rope