Frequency

What is frequency in audio? How is it measured? 
It's the amount of completed cycles that fit in one second is what we call frequency. Higher frequencies can go up to twenty completed cycles per second. To put it simply, we divide frequency in two separate groups, low and high frequencies. Low frequencies are called bass and high frequencies are called treble. Sinewaves are electronically generated, you won't hear for example a dog barking pure sinewaves. The sinewave is the purest and simplest form and it's not found in nature. 

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