Friday, 19 January 2018

system - Meaning of causal signal


What exactly does causal signal mean?


Causality,as I see it is a property of a system wherein the output at PRESENT is dependent ONLY on PAST and PRESENT values of input.Here we have a reference of Output signal Time to define PAST & PRESENT for an input.


Since an isolated signal doesn't have a concept of a STATE,how can we define past or present for a signal?


If ideas of Past & Present aren't defined for a signal,how can the idea of causality be defined for signals?


Here the definition is given but I 'm not able to get a feel of Causality of a signal?


I've a follow-up question which I've put up here.




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