In response to the input signal a continuous system generates an output signal suppose we have two variable x and y and both vary with time continuous signals are represented within parenthesis figure describe continuous system discrete systems in discrete systems both input and output signals are discrete signals the variables in the discrete systems vary with time. Continuous and discrete time signals and systems andrian dwiputro mrinal mandal. Continuous and discreet time signals 2nd edition by samir s soliman and mandyam d srinath. There are two types of signals discrete time and continuous time signals discrete time signals are defined at the discrete moment of time and the mathematical function takes the discrete set of values continuous time signals are characterised by independent variables that are continuous and define a continuous set of values