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.
A voice change or voice mutation, sometimes referred to as a voice break, commonly refers to the deepening of the voice of people as they reach puberty. Before puberty, boys and girls have roughly similar vocal pitch, but during puberty the male voice typically deepens an octave, while the female voice usually only deepens by a few notes.