- Tech know how online

lossless predictive audio compression (LPAC)

Lossless Predictive Audio Compression (LPAC) is a lossless audio compression. This means that after decompression, the compressed signals are again identical to the original signals. With lossless compression, the compression rate is much lower than with lossy compression. For example, LPAC achieves a compression ratio of 1.5: 1 to 4:1, whereas MP3 lossy compression achieves a ratio of 11:1, for example.

LPAC compression works with linear prediction and can digitize audio signals with 8 bits, 16 bits, 20 bits and 24 bits in monophony and stereophony. Due to the linear prediction, which works with a prediction regarding the upcoming signals, LPAC compression is much faster than Lossless Transform Audio Compression( LTAC) and also has a better compression ratio.

LPAC has cyclic block checking(CRC) for error detection, a graphical interface, and a total of six different compression modes for different compressions and speeds. The playback speed can be a multiple of the real-time speed. The files that have the extension *.pac can be played using a WinAmp player.

There are LPAC versions supported by Windows, Linux and Solaris.

Englisch: lossless predictive audio compression - LPAC
Updated at: 11.10.2013
#Words: 170
Links: audio compression, decompression, compression rate, MPEG audio layer 3 (MP3), lossless transform audio compression (LTAC)
Translations: DE

All rights reserved DATACOM Buchverlag GmbH © 2023