What Can We Ear?
The audible frequency range varies from 20 Hz to 20 kHz. As for the perception of the volume of a sound, the human ear does not react in a linear way for the perception of the pitch of a sound.
One Good Example? Music!
The best example is the principle of octaves in music. The previous figure shows a typical piano keyboard with 88 keys. The first key allows you to play note A0 at 27.5 Hz. The same note A at the next octave will be at 55 Hz, i.e. twice the initial frequency.
To move from one octave to the next, the frequency is multiplied by 2. This means that to obtain the same sensation of increasing the pitch of a sound, a difference of 110 Hz is needed at low frequency (A2 to A3) or 1760 Hz at the highest frequency (A6 to A7).
Want to Learn More?
This article takes place in our Acoustic 101 serie!