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Leo Lam © 2010-2012 Welcome This is EE235 BackHuskies!

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Leo Lam © 2010-2012 Today’s menu Introductions Class logistics and expectations Help available Course material starts!

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Leo Lam © 2010-2012 Introduction Who is this bozo? –Email: lll@uw.edulll@uw.edu –Anonymous message welcome –Office: PAE 238 Performance guarantee –You are my customers –12-hour email response –Reasonable –Candy bar challenge! Five questions!

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Leo Lam © 2010-2012 Introduction TA: Ruizhi Sun –Email: rsun0002@uw.edu –Office hours: TBD –EE 333

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Leo Lam © 2010-2012 Introduction You!

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Goal Introduction to the “language” of “signals” Manipulating the language (the “system”) Using MATLAB to play with it Preparation for DSP etc. System level thinking Engineering “sense” Communicating with each other technically Discipline in practicing engineering Leo Lam © 2010-2012

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Logistics Four lectures One lab per week Lab begins next week (need EE account) Grading –60% consistent work –40% “exams” (1 week-5 midterm/1 Final) –Fair, consistent, not “mean” Website (EE Academics Class Homepage): wp.ee.washington.edu/ee235sum2012/ Pre-req: Math 136,307,Amath 351, PHY 122 or CSE 142 etc.

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Leo Lam © 2010-2012 Textbook: $$$ Not required, but recommended Two books recommended –Matlab Primer –Schaum's Outline of Signals and Systems –Advanced Engineering Mathematics

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Leo Lam © 2010-2012 Expectations Active, curious, question Practice, Practice, Practice Work together Integrity, honor & discipline Lab (six labs) –Read the manual beforehand –Communicate clearly –Collaborate

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Leo Lam © 2010-2012 Help? Facebook Group! – Your learning social media Me and TA (office hours) Each other (and meet new friends!) HKN help for 215, 233, 235

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Leo Lam © 2010-2011 To do Join Facebook Group Read Lab 1

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Leo Lam © 2010-2012 Questions? Before the launch…

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Definition: Signal A signal is a set of information or data that can be modeled as a function of one or more independent variables. Leo Lam © 2010-2011

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Examples of a “signal”? Electrical parameter over time Radio over time and space Sound/Pressure over time Medical parameters over time Images Video Stock prices (discrete time) People in a room daily (discrete variable/time) Leo Lam © 2010-2012

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There’s a theme here Continuous time Continuous variable e.g. talking to you Continuous time Discrete Variable e.g. people in the room Discrete time Continuous variable e.g. daily temperature Discrete time Discrete variable e.g. data recorded on CD Leo Lam © 2010-2011

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Taking a signal apart Leo Lam © 2010-2011 a0a0 T t (seconds) A+a 0 A sound signal Offset (atmospheric pressure) Frequency Amplitude

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Frequency Leo Lam © 2010-2011 196 t (seconds)f (Hz) = time-domainfrequency-domain

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t to f Leo Lam © 2010-2011 293.66 t (seconds) 196 440 659.26 F (Hz)

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Combining signals Leo Lam © 2010-2011

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Summary: Signals Signals carry information Signals represented by functions over time or space Signals can be represented in both time and frequency domains Signals can be summed in both time and frequency domains Leo Lam © 2010-2011

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Systems A system describes a relationship between input and output Examples? Leo Lam © 2010-2011 v(t)y(t)g(t)

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Today What is a signal Some examples Leo Lam © 2010-2012

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