under construction
Q: What is ECE 438 about? A: Digital signals and systems.
Q: What is a digital signal? A: A signal that can be represented by a sequence of 0's and 1's. The signal must be discrete time (D.T.): x[n], n e Z The signal values must come from a discrete and finite signal. e.g. x[n] e {0,1}
x[n] e {0,1,2,3,...,255} (grayscale values)
The digital system
digital signal -> system -> digital signal
Three main types Software (MATLAB, C Program) Firmware Hardware
Advantages of digital signals & systems Digital Systems are: -precise -reproducible -easy to build -adaptable -easy to upgrade/fix -can be saved on bistable storage device
x(t) CT World -------------------> x[n] DT World -most natural signals live here -digital media lives here -things are intuitive along with computers, MATLAB, -easy math and digital circuits.
