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.
Males compete using songs to attract mates by rubbing their genitalia against ridged abdomens in a process called stridulation. The area they use is only about the width of a human hair, but they sure can make plenty of sound. At over ninety nine decibels, they are almost as loud as a subway train or a chain saw.