Definitions for "Fundamental Frequency"
The frequency of line current. In North America, this is 60 Hertz.
the lowest resonant frequency of vibration
The lowest frequency in a harmonic complex tone, such as the FONIX Composite signal. The fundamental frequency determines the "pitch" of a tone.
Keywords:  ikw, ntl, nsi
ˌfʌndəˈmɛntl̩ ˈfɹikwənsi