Flashcards
Lecture 2
Cards in this deck (12)
- 1What is a signal?a time-varying function that generally carries some information
- 2What is a system?involved in the generation, extraction, modification, transformation, manipulation or transduction of signals
- 3What is the purpose of the field of signals and systems?to use abstracted mathematical models to describe and analyze signals and systems and to explain what a system does to a signal
- 4Analog signals are ________ in time and amplitude.continuous
- 5Digital signals are _________ in time and amplitude.discrete
- 6—Unit step function
(can also have value of 0.5 at t=0) - 7—Unit ramp function
- 8Relation between unit-step and unit-ramp functions?Also u(t) is the first derivative of r(t) with respect to t except for at t = 0 where derivative is undefined
- 9—Unit Impulse
- 10Relation between unit impulse function and unit step function
- 11A continuous-time signal is said to be periodic with period T if:
- 12Why are Fourier transforms important in signal processing?Used for the analysis of finite, realistic signals