Data Compression


Criteria

Survey Formats

Basics

Basic Terms

Symbol

Set of Symbols

Alphabet

Code

Coding

Redundancy

Information Theory

Message

Probability

Information

Entropy

Redundancy Reduction

Irrelevance Reduction

Entropy Coding

Variable Length Codes

Code Trees

Compression Methods

Data Formats


Glossary

Index


Download


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Message


In terms of information theory a message is a basic quantity that will transport information. Messages will be send from an information source to a destination resulting in information at the receiver.


Considering information theory it is of importance that the contents of a message is finite; it must originate from a well defined range of values. Besides, a message has no meaning in a general sense, it is only able to transport a value.


With regards to files having an arbitrary contents a message is equivalent to the basic unit used for data access. That is commonly but not necessarily the byte. In this context a message is able to carry 1 of 256 values.


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