olemus
ISO/IEC 2382:
ajas järjestikustest elementidest koosnev signaal, mille igal elemendil on üks või mitu tunnussuurust, mis võivad esitada andmeid, näiteks elemendi kestus, paiknemine ajas, laine kuju või amplituud
= a signal composed of successive elements in time, each element having one or more characteristic quantities which can represent data
Note. Examples of characteristic quantities are amplitude, wave-form, duration, and position in time.



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

http://www.chegg.com/homework-help/definitions/continuous-and-discrete-signals-4

https://www.quora.com/What-is-the-difference-between-a-discrete-and-digital-signal

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

http://www.eie.polyu.edu.hk/~enyhchan/ss_fodsp.pdf

http://www.ee.nchu.edu.tw/pic/courseitem/1438_chapter1.pdf

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