audio frequency

noun Acoustics, Electronics.
a frequency between 15 Hz and 20,000 Hz, within the range of normally audible sound.

1910–15 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
audio frequency
a frequency in the range 20 hertz to 20 000 hertz. A sound wave of this frequency would be audible to the human ear

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
When they applied an electric current with an audio frequency to the sheets, the sheets broadcast the sounds loud and clear.
The sensors are modulated with a unique audio frequency.
The loaded system gives fundamental mode resonances in the audio frequency band at approximately half a wavelength.
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