Welcome to this tutorial on the audio spectrum.

The human ear is capable of hearing soundwaves of frequencies approximately between 20Hz (or 20 cycles per sec) and 20kHz (or 20,000 cycles per sec). This range of frequencies is known as the audio spectrum, or sometimes "hearing range".

Caption - Relationship between Frequency and Pitch

The frequency range of 20Hz to 20kHz is equivalent to about 10 octaves in pitch. An octave on a piano equals 12 notes or semitones. The higher the frequency the higher the pitch.

A4 on a piano is 440Hz, therefore A5 is 880Hz and A3 is 220Hz .

Every increase in pitch by 1 octave doubles the frequency.
Every decrease in pitch by 1 octave halves the frequency.

This diagram relates frequency to pitch and notes values, common EQ terminology, and instrument and human voice ranges.

Caption - Thanks for watching

The script for this tutorial, with accompanying screenshots, can be found at projectstudiohandbook.com 

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Thanks for watching.