ECE 403 Audio Engineering
Course Description
Review of resonance and wave phenomena; acoustics of rooms and auditoriums; artificial reverberation and sound localization/spatialization; loudspeakers, enclosures, and microphones; and topics in digital audio.
- Instructor: Jont Allen (NetID: jontalle)
- TA: Reggie Weece (NetID: weece)
- Website
- Text: I will "sell" you a copy of the text book for $30, and you can return it for the full price at the end of the semester, if in mint condition, or for $20 if in good condition.
- Assignments: See Schedule
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 http://djvu.org/. More specifically, there are two versions, and either should work fine: the traditional version and the open source version djview4 (recommended). Please let either Prof. Allen or TA Reggie Weece know, and we will help you get started.
Notes and References
- Audio projects that failed
- Neural Audio White papers
- Holosonics Nonlinear-Ultrasonic Loudspeaker
- Passive Radiator speaker
- Conversion tables for 2-ports (page 1) and ABCD tables from Pipes (pages 2-3): djvu
- You can use SYSRES (windows zip, linux-bin) to take frequency response measurements at home.
- Network Theory Postulates
- Nonlinear acoustics: Bernoulli's Equation and conservation laws Navier-Stokes
- 3D Middle ear and cochlea view
- AAC+ encoding Slate article
- All-pass filters: a helpful explanation
- Prof. Beauchamp's ECE 403 Class Notes from Spring 2007
- Prof. Haken's Continuum Fingerboard
Spring 2008 Schedule
| Date | Lecture | Topic(s) |
|---|---|---|
| 1/14 | 1 | Introduction and interview students |
| 1/16 | 2 | 2-port (4-terminal) network representations |
| 1/18 | 3 | ABCD Matrix methods |
| 1/18 | - | HW 1 (Version 1.01) |
| 1/21 | - | No class - MLK day |
| 1/23 | 4 | Reciprocity and Reversible 2-port networks |
| 1/25 | 5 | Motional impedance (Hunt Ch. 2) |
| 1/28 | 6 | Moving coil Loudspeaker I; 2-port equations with f = BL i, E = Bl u |
| 1/30 | 7 | Loudspeaker II; lumped parameter, waves on diaphragm |
| 1/30 | - | HW 2 (Version 1.0) and an example of LaTeX. (due 2/15/08 at 5 PM) You can use SYSRES to take frequency response measurements at home. |
| 2/1 | 8 | Review of Basic Acoustics (Pressure, Volume velocity, SPL, dB) |
| 2/4 | 9 | Waves and d'Alembert solutions in 1 and 3 dimensions |
| 2/6 | 10 | Radiation impedance of a sphere |
| 2/8 | 11 | Piezoelectric transducers (Mason 1939); Horn loudspeaker and throat impedance |
| 2/11 | 12 | 6 Network Theory Postulates; Detailed review of material on Exam I |
| 2/12 | EXAM I | Exam I, Tues @ 7 PM in 170 EL: bring a 1 page, 2 sided, hand-written info sheet |
| 2/13 | - | No class due to Exam I |
| 2/15 | 13 | History of Acoustics, Part I;History of acoustics (Hunt Ch. 1); Newton's speed of sound; Lagrange & Laplace+adiabatic; Review of Exam; mop-up re Homework 2 |
| 2/15 | - | HW2 due |
| 2/18 | 14 | Review FT, zT, LT, DTFT, DFT transforms with detailed cross comparisons |
| 2/20 | 15 | Application of the Fourier vs Laplace transform; Sampling and the Poisson Sum formula; Solving differential equations; Op amp integrator example |
| 2/20 | - | Part I of Final Paper Due (draft) |
| 2/22 | 16 | low-pass filter example in gory detail (FT, zT, LT, Bilinear-z, all used) |
| 2/22 | - | HW3 (Version 1.1) (due 3/3/08); Old version (1.0); HW3 Solutions |
| 2/25 | 17 | Intensity, Energy, Power conservation, Parseval's Thm., Bode plots (NOT spectral analysis) |
| 2/27 | 18 | Short-time Fourier Transform Analysis-Synthesis |
| 2/29 | 19 | How a Guitar works; Spectral analysis |
| 3/3 | 20 | Spectral Analysis and random variables: Resistor thermal noise derivation (Nyquist 1928 paper djvu) P=4kTB |
| 3/3 | - | HW3 due; HW4 (due 3/14/08 at 5 PM) |
| 3/5 | 21 | Hilbert Transform example; Cepstral analysis |
| 3/7 | - | No class - Engineering Open house |
| 3/10 | 22 | wave propagation in horns and the inhomogeneous wave equation |
| 3/12 | 23 | More history; Review of FS, FT, DFT, zT, LT, filters, ->horns<-; Discuss material on Exam II |
| 3/12 | EXAM II | Exam II, Wed @ 7 PM in 260 EL |
| 3/14 | - | HW4 due |
| 3/14 | - | Assigned: HW5 due 4/9/08 |
| 3/17 | - | No class - Spring Break |
| 3/19 | - | No class - Spring Break |
| 3/21 | - | No class - Spring Break |
| 3/24 | 24 | Room acoustics, 1 wall = 1 image, 2 walls = inf images |
| 3/24 | - | Part II of Final Paper Due (draft II) |
| 3/26 | 25 | Room acoustics: arrays of images with 6 walls; Room model pdf; Room Inverse djvu |
| 3/28 | 26 | Physiological Acoustics introduction; Middle ear as a delay line |
| 3/31 | 27 | Guest Lecture: Concert Hall acoustics |
| 4/2 | 32 | Guest lecture: Computer music |
| 4/4 | 33 | Transmission line Theory; reflections at junctions |
| 4/7 | 34 | Anatomy of the cochlea; Cochlea basic functions: Nonlinear cochlear signal processing (NLCSP): pdf, djvu; Read Sect. 3.1 |
| 4/9 | - | HW5 due; Solution:pdf; Bauer Equivalent Circuit for freefield radiation (djvu, pdf) |
| 4/9 | 35 | JND, Fechner and Weber laws, counting JNDs; 2AFC; Why is the JND important to Eng. Acoustics?; Read Sect. 3.3 NLCSP; Loudness and the JND presentation: pdf |
| 4/11 | 36 | Masking, Wegel and Lane 1934, Upward spread of masking; 2 Tone suppression; Read NLCSP Sect. 3.2 |
| 4/14 | 37 | How does a neuron work (Description of ion channels, lipid bilayer, Hodgin Huxley Eqs) |
| 4/16 | 38 | Audio coding, masking and cochlear compression; filter banks, modulations and bits; NLCSP Sect. 3.2 |
| 4/18 | 39 | Compression of audio; quantization of audio; what is Entropy |
| 4/21 | 40 | Intuition behind Entropy, why is it useful; Brief intro to Information theory |
| 4/23 | 41 | Audio on Film (Guest Lecture Lorr Kramer) CONFIRMED 1/27/08 |
| 4/25 | 42 | Sigma delta codecs (Guest Lecture?) |
| 4/28 | 43 | Hearing aid array processing (Guest Lecture: Dan Warren, Knowles) |
| 4/28 | 44 | Summary discussion and overview of course (Fun!) |
| 5/1 | 45 | READING DAY; Final paper due by midnight: Please give me both a paper and pdf copy. NO DOC files |
Final grade distribution:
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. Homework 2 was not included, thus the total homework was worth 20 points toward the final score. 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. However, extra credit (EC) points were given when one of the 33 topics was really well explained. Some people received up to 3 extra credit points on a few of the topics. One-half the EC points were then added to the final score. Up to 5 points were then given for your formatting of the final exam. The sum of your raw score, the formating points, and the extracredit points comprised the final exam score. A normalization (100/100.75) was applied to everyone, to force the top score be exactly 100%. All grade calculations were done in Matlab, and spot-checked by hand.
Example: Score = 0.2*mean(HW)+.5*mean(Exams)+Final (within 1 point due to rounding and normalization).
In the end, it did not seem necessary (or wise) to adjust the scores based on Grad vs. Undergrad. The top 4 were grads, the 5th an UG. If anyone feels this is not a fair evaluation, they need to speak to me right away, before I post the final grades.
| Not proofed beyond here |
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