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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.

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Alumni Liaison

Ph.D. 2007, working on developing cool imaging technologies for digital cameras, camera phones, and video surveillance cameras.

Buyue Zhang