Infra sound refers to sound waves below the range of human hearing. Infra sound comes from a number of natural phenomena including weather changes, thunder, and ocean waves. Common man made sources include heating and ventilation systems, industrial machinery, moving vehicle cabins (air, trains, cars), and energy generation (wind turbines, gas plants).
In this talk I will present equipment I have built to measure infra sound, and analyse some of the infra sound I have recorded.
Note: In Winter 2016 I will be offering a new course, in Computer Sound. The course will appear as CS489/CS689 ("Topics in Computer Science"). This is a project-based course (60% assignments, 40% project, no final). Details at my web page, http://www.cs.uwaterloo.ca/~mannr.