Last Modified : Tue, 26 Jan 10

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)
• 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 Prof. Allen 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 Δ
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 Δ 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 Δ
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