Discrete Information Source is an #Information Source which has only a finite set of symbols (called source alphabet) as possible outputs. The elements within the set are known as symbols.
Mathematical operations in #Discrete Memoryless Source (DMS).
Information Source is an object that produces a symbol or an event, where the outcome is random and is subjected to some probability distribution. In Communication System#, it is a device that produces messages in either analogue or digital form. In addition, analogue sources could be transformed into discrete form# by sampling and quantisation techniques.
The definition of DMS is Discrete Information Source#.