# part2 - Part 2 Classification of Signals and Systems Signal...

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Part 2: Classification of Signals and Systems Signal z Signal: a function of time that represents a physical variable of interest associated with a system microwave signal

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Classification of Signals z Deterministic Random z Continuous Discrete z Analog Digital z Periodic Non-periodic z Non-singular Singular z Energy Power Deterministic or Random z Deterministic: Signal can be modeled as a specific function of time e.g. traffic light, x(t)=sin(10t) z Random: Signal has some uncertainty, can only be described by their statistical properties e.g. noise, wave
Continuous or Discrete z Continuous-time signal: the signal must be defined at all instants in time. z Discrete-time signal: the signal is defined only at particular instants of time. time time Analog or Digital z Analog signal: the signal can have a continuous range of amplitudes z Digital signal: the signal is quantized and has finite set of amplitudes. time time

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Periodic or Non-periodic z Periodic signal: the signal satisfy the following condition: x(t) = x(t+T) for all t (1) where T is known as the period of the signal if it is the minimum positive value satisfying (1). z Non-periodic (aperiodic) signal: the signal does not satisfy (1). time time Energy or Power z Total energy of an arbitrary signal x(t) z Average power of the signal x(t) z x(t) is an energy signal 0<E< , P=0 z x(t) is a power signal 0<P< , E= z Neither energy or power signals if neither properties are satisfied.
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part2 - Part 2 Classification of Signals and Systems Signal...

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