Loudness level, definition

Loudness level, definition, 14-48 to 49 Low-Temperature Baths for Maintaining Constant Temperature, 15-35 Lumen, definition, 1-23 to 26 Lutetiumi see also Elements... 

Scaling experiments using steady-state signals have shown that the loudness of a sound is a non-linear function of the intensity. Extensive measurements on the relationship between intensity and loudness have led to the definition of the Sone. A steady-state sinusoid of 1 kHz at a level of 40 dB SPL is defined to have a loudness of one Sone. The loudness of other sounds can be estimated in psychoacoustic experiments. In a first approximation towards calculating the internal representation one would map the physical representation in dB/Bark onto a representation in Sone/Bark ... 

Noises are considered continuous if the interval between occurrences of the maximum noise level is 1 second or less. Noises not meeting this definition are considered impact or impulse noises. Exposure to impact or impulse noises (loud momentary explosions of sound) must not exceed 140 dBA. Examples of impact or impulse noises may include the noise from a powder-actuated nail gun, the noise from a punch press, or the noise from drop hammers. 

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