1. BPC: Art and Computation – Summer 2007 Digital Media - Audio Glenn Bresnahan glenn@bu.edu

2. BPC: Art and Computation – Summer 20072 Overview Principles and properties of sound and perception –Lessons 5.a & 5.b - 1 class each Glenn Bresnahan, Robert Putnam –Lectures & demonstrations Sound recording and digital editing –Lesson 6 - 3 classes Manny Rettinger –Studio and field work, instruction+lab

3. BPC: Art and Computation – Summer 20073 Synopsis Physical properties Mathematical properties of sine waves Representation of functions as graphs of sound Characteristics of real sounds Analog and digital representation and recording of sound Field and studio recording techniques and equipment Digital audio manipulation and editing

4. BPC: Art and Computation – Summer 20074 Digital Audio: Sound and Hearing (5.a) Objectives –Understanding of the basics physics of sound Understanding the fundamentals of waves –Mathematically –Physical properties of sound waves –Composition of complex waves from sine waves Representation and transductions of signals –Biophysics of human hearing

5. BPC: Art and Computation – Summer 20075 Sound wave concepts Mathematical properties of (sine) waves –Amplitude, wavelength, frequency, period and speed –Representation: function graphs/plots Principles of sound –Vibrations & resonance –Physical properties of sound (frequency, speed, sound pressure levels) Real sounds –Absorption and reflection (reverberation) –Compound frequencies Signal transduction –Converting between SPL and current

6. BPC: Art and Computation – Summer 20076 Sound waves approach Analogies to cyclical phenomena –Waves in water, moon phases, sun rise/set, tides

7. BPC: Art and Computation – Summer 20077 Moon phases

8. BPC: Art and Computation – Summer 20078 Cause of tides Gravity from moon and sun 365 days 27.3 days (29.5 days) New moon Full moon 1 day

9. BPC: Art and Computation – Summer 20079 Sunrise and sunset solstice

10. BPC: Art and Computation – Summer 200710 Sound and vibration Demonstration with real instruments

11. BPC: Art and Computation – Summer 200711 Transverse waves in time and space string Energy (pluck) vibration Air pressure level

12. BPC: Art and Computation – Summer 200712 Combinations of waves

13. BPC: Art and Computation – Summer 200713 Properties of sound – real sounds

14. BPC: Art and Computation – Summer 200714 How do we hear? Sound waves move through the air from the sound source to the ear

15. BPC: Art and Computation – Summer 200715 Anatomy of the ear

16. BPC: Art and Computation – Summer 200716 Haircells and neural firings

17. BPC: Art and Computation – Summer 200717 Binaural hearing - why two ears? Two ears, so we can identify locations of sounds –Time difference –Intensity difference –Sound color difference (caused by movement of sound around head and shoulders)

18. BPC: Art and Computation – Summer 200718 Lecture Materials Digital Audio Parts 1 & 2: http://scv.bu.edu/BPC/MaterialsFall06 /lectures/BPC-Class-DigitalMedia- Audio.ppt