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Characterization of Signals Frequency Domain
eeweb.poly.edu©Yao Wang, 2006 EE3414: Signal Characterization 3 What is a signal • A variable (or multiple variables) that changes in time – Speech or audio signal: A sound amplitude that varies in time
Modulation for Analog
eeweb.poly.edu©Yao Wang, 2006 EE3414: Analog Communications 3 Baseband Communications • Signal strength attenuates with distance. Needs repeaters to amplify the signals in stages