The following question in full and provide reliable references when using someone else's idea. not that soft is not the same as firm real-time systems. i would love using simple examples that are easy to distinguish with (i already check google).
consider three examples of real time systems, nominating one "hard" real-time, one "soft" real-time, and one "firm" real time. in each case, you should justify your reasons. you should consider the time-scale of the system, that is how much time-over-run of the deadlines can occur before loss becomes noticeable. you should also consider the gradient of the loss function. how much over-run would cause complete failure of the system, for example?