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n. Abbr. AF
A range of frequencies, usually from 15 hertz to 20,000 hertz, characteristic of signals audible to the normal human ear.
(General Physics) a frequency in the range 20 hertz to 20 000 hertz. A sound wave of this frequency would be audible to the human ear
a frequency between 15 Hz and 20,000 Hz, within the range of normally audible sound.