What is frequency in audio? How is it measured?
A frequency in audio is the about of completed wavelengths in a second. The higher the frequency, the more wavelengths are fitting in a second, and vice versa. Lower frequencies are called bass, and higher ones are called treble. Frequency is measured in Hertz, or Hz. The human ear can hear the lowest of 20 Hz, and the highest the human ear can hear is 20 KiloHertz, or 20,000 Hz.
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