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Communication principle: the amount of information output by information sources
In fact, the topic is to examine information and its sources. Is the knowledge of communication principles.

Symbolic probability of information source

An information source is composed of four symbols, A, B, C and D, and their occurrence probabilities are 3/8, 1/4, 1/8 respectively, and the appearance of each symbol is independent.

Information sequence statistics

In the information sequence output by the source, A: 23 times, B: 14 times, C: 13 times and D: 7 times, and there are 57 * * *.

Information computing

The information content of A is 23 log28/3 = 32 (bits); The information of b is 14Log24/ 1 = 28 (bits); The information content of C is 13Log24/ 1 = 26 (bits); The information content of d is 7log28/ 1 =2 1 (bits).