Acoustic Phonetics

• Review Notes
• Note office hours on 4/30 Thursday are cancelled due to Dr. Goldin-Meadow's talk.
• Make up office hours are on Tuesday 5/4 at 1pm and by appt.

4/27 Lab

• Lab Assignment 4 - Summary of research article
• Tentative Schedule for class presentations

4/22 (Chapter 9)

• Some notes on Chapter 9.
• Homework due Monday 4/27.
  • Chapter 7. #2.
  • Chapter 8. #4,5.
  • Chapter 9. # 1,2,3,4. (For question #3, you may assume that the palatal region is about 1cm from the alveolar ridge.)

4/20 Lab

• Continued working on Vowel Quality Lab.
• Details for final project presentations and papers.

4/15 (Chapter 8)

• Some notes on Chapter 8.
• Hear how different languags make contrastive use of phonation types
  • Gujarati contrasts breathy and modal vowels
  • Mazatec contrasts breathy, modal, and creaky vowels
  • Quecha has ejective stops and Sindhi has implosive stops.
  • Explore more here

4/13 Lab

• Lab on vowel quality - Instructions
• Sound files
  • bababa.wav
  • babibi.wav
  • bibibi.wav
  • bibaba.wav

4/8 (Chapter 7)

• Some notes on Chapter 7.

4/6 (more on Chapter 6)

• Some figures illustrating quantal theory, and vowel perception.

3/25 (Chapter 6)

• Some notes on Chapter 6.
• A demonstration of standing wave patterns, nodes and antinodes
• More info on standing waves, nodes and antinodes
• An article from Scientific American on pertubation theory.
• Homework. Due April 13, 2009.
• Chapter 5. page 101. #2,3,4
• Chapter 6. page 119. #1,2,3,4

3/23 Lab

• Continued working on Speech Perception Lab.

3/18

• Exam on Chapters 1-4.

3/16 Lab

• Perception Lab Assignment
• The sound file in .wav format (right-click to save file)
• Assignment is due March 25 (1 week from Wednesday). There will also be time next lab March 23 to work on this assignment.
• Don't forget exam on Chapters 1-4 this Wednesday Mar 18!

3/11 (Chapter 5)

• Chapter 5 notes on harmonics and resonances (formants)
• Ruben's Tube Demo of standing waves in a tube closed at both ends
• The illustrations below is just to give an idea of why waves can phase shift when reflecting
  • Waves along strings reflecting
  • Note the "hard boundary" case for strings is analgous to the "tube open at one end" case and the "soft boundary" case for strings is analgous to the "tube closed at both ends" case.

3/9 Lab

• Continued woking on VOT and duration lab.

3/4 (Chapter 4)

• Chapter 4 notes on computing perceptual distances plus useful figures
• MDS example
• McGurk Demo #1
• McGurk Demo #2

3/2 Lab

• UD cancels all classes due to snowfall.
• Lab assignment now due on 3/11. See revised schedule on main page.

2/25 (Chapter 3)

• Anatomy of the ear
• Animation #1 of the basilar membrane
• Animation #2 of the basilar membrane
• Sound demos (from Elliott Moreton)
• Illustration of frequency effects on loudness: a tone raising from 70Hz to 17kHz with constant pressure amplitude
• Illustration of Hz versus Bark frequency scales.
  • a tone increasing in 1000 Hz increments: 500Hz, 1500Hz, 2500Hz,...
  • a tone increasing in 1 Bark increments
• Review/Summary of Digital Signal Processing techniques from Chapter 2

2/23 Lab

• Today we finish up the slides from last class.
• Here are some notes on digital filters, Linear Predictive Coding, and RMS Amplitude.
• Here is your lab assignment due March 4, 2009 (1 week from Wednesday). Next week's lab is devoted to this assignment as well.
  • The assignment itself
  • More detailed instructions on the report you turn in
  • The sound files you will need:   1     2     3     4     (all 4 files as a zip file)
  • Tips from Laura Spinu on measuring VOT
  • Tips from Edward Flemming on measuring vowel duration

2/18 (Chapter 2)

• Slides illustrating aspects of Analog to Digital conversion and digital speech processing.

• Homework Due: 2/18
• A praat collection of simple and complex periodic waves of the kind constructed and perceived in class

• Chapter 1 Lecture Notes

Links

• What is sound?
• Kinds of Waves
• Longitudinal Waves and Compression and Rarefaction
• Uniform circular motion and sine waves
• Fourier illustrations of different kinds of waves (sawtooth, etc)
• Sine wave applet