Leo Lam © 2010-2012 Welcome This is EE235 BackHuskies!
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Transcript of Leo Lam © 2010-2012 Welcome This is EE235 BackHuskies!
Leo Lam © 2010-2012
Welcome
This is EE235
BackHuskies!
Leo Lam © 2010-2012
Today’s menu
• Introductions• Class logistics and expectations• Help available• Course material starts!
Leo Lam © 2010-2012
Introduction
• Who is this bozo?– Email: [email protected]– Anonymous message welcome– Office: PAE 238
• Performance guarantee– You are my customers– 12-hour email response– Reasonable– Candy bar challenge!
• Five questions!
Leo Lam © 2010-2012
Introduction
• TA: Ruizhi Sun– Email: [email protected]– Office hours: TBD– EE 333
Leo Lam © 2010-2012
Introduction
• You!
Leo Lam © 2010-2012
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
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 (EEAcademicsClass Homepage): wp.ee.washington.edu/ee235sum2012/
• Pre-req: Math 136,307,Amath 351, PHY 122 or CSE 142 etc.
Leo Lam © 2010-2012
Textbook: $$$• Not required, but recommended• Two books recommended
– Matlab Primer– Schaum's Outline of Signals and Systems– Advanced Engineering Mathematics
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
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
Leo Lam © 2010-2011
To do
• Join Facebook Group• Read Lab 1
Leo Lam © 2010-2012
Questions?
• Before the launch…
Leo Lam © 2010-2011
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 © 2010-2012
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 © 2010-2011
There’s a theme here
Continuous timeContinuous variable
e.g. talking to you
Continuous timeDiscrete Variable
e.g. people in the room
Discrete timeContinuous variable
e.g. daily temperature
Discrete timeDiscrete variable
e.g. data recorded on CD
Leo Lam © 2010-2011
Taking a signal apart
a0
0 0( ) sin(2 )s t A f t a
T t (seconds)
A+a0
A sound signal
Offset (atmospheric pressure)
Frequency
Amplitude
Leo Lam © 2010-2011
Frequency
196t (seconds) f (Hz)
=
time-domain frequency-domain
Hzf 1960 )2sin()( 0tftg
Leo Lam © 2010-2011
t to f
293.66
t (seconds)
196
440
659.26F (Hz)
Leo Lam © 2010-2011
Combining signals
Leo Lam © 2010-2011
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
Systems
• A system describes a relationship between input and output
• Examples?
v(t) y(t)g(t)
Leo Lam © 2010-2012
Today
• What is a signal• Some examples
