Lempel-Ziv Welch (LZW) Compression
Algorithm used by the Unix compress command to reduce the size of files, eg. for archival or transmission. The algorithm relies on repetition of byte sequences (strings) in its input. It maintains a table mapping input strings to their associated output codes. The table initially contains mappings for all possible strings of length one. Input is taken one byte at a time to find the longest initial string present in the table. The code for that string is output and then the string is extended with one more input byte, b. A new entry is added to the table mapping the extended string to the next unused code (obtained by incrementing a counter). The process repeats, starting from byte b. The number of bits in an output code, and hence the maximum number of entries in the table is usually fixed and once this limit is reached, no more entries are added.


LFE (Low Frequency Enhancement) channel
A limited bandwidth channel for low frequency audio effects in a multichannel system. It's often referred as the ".1" channel.


Liquid Audio
Based in Redwood City, Liquid Audio is the pioneer and current market leader in downloadable media commerce technology on the Internet. The company derives its revenue from the delivery of software products including authoring tools, and servers for media commerce; as well as media commerce services. While the Liquid Audio media architecture can support multiple audio coding standards, the default codec is based on AAC and includes copy protection features.