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Critical Listening Skills for Audio Professionals by F. Alton Everest

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Tones, speech, and music

TalkTech
It is often necessary to estimate how much a sound level changes. Our ear interprets sound level changes as changes in loudness. The decibel is a very convenient unit for measuring signal levels in electronic circuits or even sound pressure levels in air. However, changes in the loudness of sounds as perceived by our ears do not conform exactly to corresponding changes in sound level.

Definitions

Sound Level: a physical quantity (measured with instruments) Loudness: a psycho-physical sensation perceived by the human ear/brain mechanism Decibel: one-tenth of a bel, which is the logarithm of the ratio of any two power-like quantities Logarithm: (common log to base 10) of a number is the exponent of 10 that yields ...

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