Courses

Last Modified : November 07, 2011, at 08:31 AM

ECE 403 Audio Engineering

  • Instructor: Jont Allen (NetID: jontalle); ECE 403 Websites: 2010, 2009; 2008; Time-table: UIUC-ECE403; Text: Electroacoustics (Buy, TOC, Preface,Preface1, djvu); Office hours: 2-3 Friday (following class)
  • Topics: acoustic wave phenomena; acoustics of rooms and auditoriums; artificial reverberation and sound localization/spatialization; Transducer design (2-port networks, loudspeakers, microphones); Topics in digital audio.
  • Goals: As in 2009; Syllabus: 2009; Assignments: See failed to render LaTeX below;

Spring 2010 failed to render LaTeX

L W D Date TOPIC
0 3 M 1/18 MLK Day; no class
Part I: Linear Acoustics Systems Theory (12 lectures)
1 W 1/20 Introduction; Review Fourier Trans. failed to render LaTeX and the Laplace Trans. failed to render LaTeX;
A detailed comparison of the step function failed to render LaTeX for each transform: Why failed to render LaTeX and failed to render LaTeX are not the same.
The strange case of failed to render LaTeX,failed to render LaTeX, failed to render LaTeX and failed to render LaTeX
2 F 1/22 1. Applications of the Laplace transform failed to render LaTeX where failed to render LaTeX is time and failed to render LaTeX is frequency
2. Convolution of vectors failed to render LaTeX product of polynomials: failed to render LaTeX, where
failed to render LaTeX, failed to render LaTeX and failed to render LaTeX, failed to render LaTeX
3. Functions of a complex variable: The calculus of Analytic functions failed to render LaTeX, failed to render LaTeX.
3 4 M 1/25 1. Solving differential equations: The characteristic polynomial failed to render LaTeX
2. Properties of failed to render LaTeX: Roots of failed to render LaTeX in LHP.
3. Definition of the Inverse Laplace transform failed to render LaTeX: failed to render LaTeX
3. Definition of an Analytic function F(s): Must satisfy the Cauchy-Riemann conditions, assuring that failed to render LaTeX and failed to render LaTeX (e.g. failed to render LaTeX) are defined.
4. Using the Cauchy Integral Theorm to compute failed to render LaTeX
5. Special classes of impulse responses: Minimum phase (MP), positive real (PR), all-pole (Strictly-IIR), all-zero (Strictly-FIR) and allpass (AP) functions
4 W 1/27

6. Detailed example using of a 1failed to render LaTeX-order lowpass filter: the FT failed to render LaTeX, zT, Laplace Transform failed to render LaTeX, DFT, Bilinear-z, etc.; HW-1 (due 2/10/2010)

5 F 1/29

Class discussion of HW-1 Come prepared to discuss and ask about the the problems you don't understand.

6 5 M 2/1 Review of the Fourier Transform [e.g.: failed to render LaTeX, failed to render LaTeX; failed to render LaTeX, etc.]
Periodic Functions: failed to render LaTeX with failed to render LaTeX and their Fourier Series failed to render LaTeX;
Sampling and the Poisson Sum formula failed to render LaTeX or in a a more compact form: failed to render LaTeX
7 W 2/3

Class canceled and Replaced by: iOptics seminar (12-1) 1000 MNTL (Abstract) free Pizza!

8 F 2/5

Short-time Fourier Transform (STFT) Analysis-Synthesis: Let failed to render LaTeX be low-pass with failed to render LaTeX, normalize such that: failed to render LaTeX. Then failed to render LaTeX (pdf)

9 6 M 2/8 More on Fourier Transform analysis; Hilbert Transform and Cepstral analysis as applications of failed to render LaTeX and its Dual failed to render LaTeX
10 W 2/10 Review of Basic Acoustics (Pressure and Volume velocity, dB-SPL, etc.); HW-2 (due 2/24/2010); Example of LaTeX (Hint: Try doing your HW using LaTeX!)
11 F 2/12

Class discussion of HW-2 FT; STFT; Acoustics

12 7 M 2/15 Wave equations and Newton's Principia (July, 1687); d'Alembert solutions in 1 and 3 dimensions of the wave equation; Radiation (wave) impedance of a sphere; Acoustic Horns;
13 W 2/17 Intensity, Energy, Power conservation, Parseval's Thm., Bode plots; Spectral Analysis and random variables: Resistor thermal noise
14 F 2/19

Review for Exam I

15 8 M 2/22

No class due to Exam I; Exam I 7-9PM Room 245EL Monday Feb 22, 2010

16 W 2/24

Review Exam solution;

17 F 2/26 Transmission line Theory; Forward, backward and reflected traveling waves; Room acoustics I: 1 wall = 1 image, 2 walls = failed to render LaTeX images
18 9 M 3/1 Room Acoustics II: 6 walls and arrays of images; simulation methods pdf
Is a room minimum phase and thus invertable? djvu
19 W 3/3 2-port networks and transmission lines;HW-3 (due 3/17/2010) Acoustic transmission lines
20 F 3/5 Discussion of HW-3
21 10 M 3/8 Gaines Hall, guest lecture on Concert Hall (NPI) acoustics.
22 W 3/10 2-Port networks; Definition and conversion between Z and T matrix; Examples, applications and meaning
Carlin 5+1 postulates 5+1 Postulates,T and Z 2-ports
23 F 3/12 No class - Engineering Open House
24 11 M 3/15 Acoustic horns: Tube acoustics where the per-unit-length impedance failed to render LaTeX and admittance failed to render LaTeX depend on space failed to render LaTeX
Radiation impedance pdf; Transmission Line discussion
25 W 3/17 History of Acoustics, Part I;History of acoustics (Hunt Ch. 1)
Newton's speed of sound; Lagrange & Laplace+adiabatic history
Review material for Exam II; Discussion of final project on Loudspeaker measurements: pdf
11 Th 3/18 Exam II, Thur @ 7 PM in 260 EL
26 F 3/19 No class (Exam II)
- 12 M 3/22 Spring Break
- W 3/24 Spring Break
- F 3/26 Spring Break
27 13 M 3/29 Transmission line Theory; reflections at junctions
28 W 3/31 Middle ear as a delay line
Starter files for middle ear simulation: [Attach:ece403_txline.m] [Attach:ece403_gamma.m]
29 F 4/2 2-Port networks: Transmission line and RC network; T and Z forms
30 14 M 4/5 Measurement of 2-port RC example + demo of stimresp
31 W 4/7 2-port reciprocal and reversible networks (T and Z forms); HW-4 (due 4/14/2010) Measurement Circuit Schematic
32 F 4/9 Throat and Radiation impedance of horn
33 15 M 4/12 2-port transducers and motional impedance (Hunt Chap. 2); Read Weece and Allen (2010) pdf
34 W 4/14 Loudspeakers: lumped parameter models, waves on diaphragm
35 F 4/16 Moving coil Loudspeaker I; 2-port equations with f = Bl i, E = Bl u
36 M 4/19 No class due to lab
37 W 4/21 No class due to lab
38 F 4/23 Guest Lecture: Lorr Kramer on Audio in Film
39 17 M 4/26 No class due to lab
40 W 4/28 Hand in early version of final paper on loudspeaker analysis
41 F 4/30 Guest Lecture: Malay Gupta (RIM): DSP Signal processing on the RIM platform
42 18 M 5/3 How a guitar works
43 W 5/5 Last day of class; Review of what we learned; discussion of how loudspeakers work (what you found)
Tr 5/6 Reading Day; Final project due by midnight: Please give me both a paper and pdf copy. NO DOC files
- F 5/7 Final Exams begin
Not proofed beyond here

Textbook

  • The textbook is Electroacoustics: The Analysis of Transduction, and Its Historical Background by Frederick V. Hunt. ISBN 0-88318-401-X.
  • Chapters 2 and 3 of the textbook are available here.
  • You will need the DjVu viewer to read/print it. This can be found at:
    viewer.
    there are two versions, and either should work fine: the traditional version and the open source version djview4 (recommended).

Final grade distribution:

  • Spring 2008
  • 2008 Final grades: 100-90->A+; 89-79->A; 78-71->A-; 70-66->B+; 65-60->B
  • The final grads were computed as follows: Each homework counted for 5 points. The two exams were each worth 25 points, for a total of 50 points. The final was broken down into 33 topics each worth 30/33 points, for a total of 30 points. This all adds to 100 points. Example: Score = 0.2*mean(HW)+.5*mean(Exams)+Final (within 1 point due to rounding and normalization).

Notes and References