A person recently asked me what I meant by the term business system.. I thought others might like to know a definition that works for me. A system is a procedure, process, method, or course of action designed to achieve a specific result.
The voiced speech of a typical adult male will have a fundamental frequency from 85 to 180 Hz, and that of a typical adult female from 165 to 255 Hz. Thus, the fundamental frequency of most speech falls below the bottom of the voice frequency band as defined above.
Another set of sounds that a hummingbird will make is the Look at me, here I am song. We here at the World of Hummingbirds timed a local hummingbird one day. This hummingbird sung this song for 23 minutes straight. Unfortunately he decided to do this very early in the morning and everyone knew exactly where he was.