Below 20 hertz
Humans can listen to sounds from 20 – 20 000 hertz. Anything above that is known as ultrasonic sound. Anything below that is known as infrasonic sound. I am interested in exploring the area of infrasound in an urban environment.
Came across this link which has a comprehensive list of infrasound and projects/research on it. This would definitely be a good reference for me.
