olemus
eeskätt signaalitöötluses:
aeg argumendina on reaalarvude hulk
= time acquiring values from the real-number set

ülevaateid
https://en.wikipedia.org/wiki/Discrete_time_and_continuous_time

https://www.student-circuit.com/learning/year2/signals-and-systems-intermediate/discrete-and-continuous-signals/

http://www2.hawaii.edu/~gurdal/EE315/class4.pdf

vt ka
- pidev funktsioon