EECS 316 Fall 1999 Lecture Topics - Jeff Fessler This list will be updated regularly (online) over the course of the semester. Course Text: Signals and systems, Oppenhiem, Willsky, Nawab, 2nd edition Lecture# topic (x.x.x indicate sections from text) 1 course policies motivations signal classes 2 signal notation 1.2 time transformations amplitude transformations differentiator system 3 integrator system two-signal operations 1.2.3 even / odd signals 1.2.2 periodicity sum of periodic signals 1.4 step and rect function 4 Dirac impulse function delta shifting property delta sampling property delta scaling property delta / step relations 5 1.1.2 energy / power signals (moved from earlier to here to facilitate HW1) 1.3.1 exponential signals (students read on own!) CT systems input-output relationship block diagram subsystem interconnection 6 1.6 system classifications A-1 linearity A-2 stability 7 A-3 invertibility T-1 causality T-2 memory 8 T-3 time-invariance summary of ch 1 impulse response 9 impulse representation convolution commutative property car example 10 graphical convolution recipe/example convolution properties 11 convolution/impulse properties interconnection of LTI systems / example causality memory 12 stability invertibility step response 13 diffeq systems - RC example time-domain solution of diffeqs impulse response of diffeqs via step response 14 block diagram implementation summary of chapter 1,2 exponential signals through LTI systems 15 review of chapter 1,2 16 skip: orthonormal signals skip: orthogonal representation of signals Fourier series Hermitian symmetry of Fourier coefficients trigonometric forms of FS FS of square wave (exam 1) 17 FS convergence Gibbs phenomenon FS amplitude transformation ideas behind ck formula 18 properties of FS FS time transformation differentiation property modulation property (skip) linearity filtering Fourier series through LTI yields Fourier series 19 example: shifting square wave by 1/4 period (by request) parseval's theorem power density spectrum magnitude/phase spectrum 20 FS of rect. pulse train FS of impulse train FS through LTI systems transfer function H(s) frequency response H(j omega), magnitude response, phase response cos/sin through LTI systems RC example (frequency response, magnitude response) 21 square wave through RC transfer function of diffeq system 22 notch filter example total harmonic distortion summary 23 class canceled (nss/mic) 24 Fourier transform development existence of FT FT of rect, impulse, exponential 25 FT of sgn, step, DC DC value FT of periodic functions linearity property time-transformation property symmetry properties (even, real) 26 general symmetry properties duality time differentiation time integration frequency differentiation convolution property derivation 27 convolution examples basics of PFE time-domain multiplication frequency shift, modulation pulsed cosine example 28 tri <-> sinc^2 parseval's theorem energy density spectrum skip: power density spectrum system response by Fourier methods RLC circuits and complex impedance by FT properties step response of RC circuit RLC frequency response example diffeq of RLC from H(w) 29 RLC impulse response example partial fraction expansions PFE example review/summary of diffeq systems / RLC / Fourier review 30 review (exam 2) 31 unit impulse review DSP overview A/D conversion FT of (impulse) sampled signals bandlimited signals nyquist sampling rate 32 sampling theorem aliasing sinc interpolation 33 linear interpolation inverse filters pulse-train sampling skip: DTFT/FT relationships 34 sinusoidal amplitude modulation demodulation frequency-division multiplexing heterodyning (overview) 35 heterodyning overview Laplace transform 36 relation between Laplace and Fourier region of convergence (ROC) general form for ROC 37 rational Laplace transforms ROC for rational Laplace transforms inverse Laplace transform modes and decay rates from s-plane PFE revisited stability of systems with rational system functions natural response / modes stability in terms of root (pole) locations 38 PFE example - complex conj. pair of poles pole-zero plot tells all magnitude and phase response from pole-zero 39 bode plots 40 LT properties feedback ------------------ everything below here from previous semester ------------- 41 ideal filters practical filters butterworth filters linear phase filter delay tradeoffs improper rational system functions and "residue" frequency scaling of poles/zeros bandwidth rms bandwidth rms time duration time-bandwidth product, gaussian example