Daa decompressor7/2/2023 ![]() ![]() If you already know the most compact storage scheme for a specific type of data, then you can simply substitute the more compact state for the actual data. This should be extended a bit, keeping it inside the scope by inclusion of some mentions of communication protocols V.42bis using Lempel Ziv dynamic dictionary compression, V.44 uses LZJH (Lempel-Ziv-Jeff-Heath) adaptive data compression.Īn example is a simple dictionary built into the compression algorithm scheme. It is not without a cause that most communication network oriented compression algorithms rely in some form of dictionary compression. This can become confusing since the algorithm relies on an internal data storage container that references the information that may in reality not be what programmers define as a dictionary, also adding to it is the fact most compression algorithms tend to be implemented into as programming object libraries files, so the algorithm can easily be reusable and updated.ĭue to its intrinsic characteristic of permitting gains when used in communications, as the example of the mike click demonstrates, there is a pre-understood code system agreed and shared between the emitter and the receptor. Some authors and implementors may refer to this type of concept as library (and then library compression), in that case library does not refer to the code implementation file. The word dictionary in this case does not relate to the programming structure that holds the data table. Some algorithms replicate this process by including an internal data table, often referred to as dictionary, hence the term dictionary compression. Remember the wealth of information a soldier gets from a mike click? With certain types of data, it makes sense that if you could encode the data using information that is not stored in the actual datafile you are compressing, you could significantly reduce known forms of storage and the requirements for communication. ![]() 10.2 compressor implementation tips and tricksĭictionary Compression. ![]()
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