Timeline for If the candela is a base SI unit, why isn't the sone an SI unit at all?
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| Dec 7, 2017 at 13:35 | comment | added | Emilio Pisanty | @MaudPieTheRocktorate As I said already, you can "define" whatever equal-loudness contour you want, and enshrine it into however many official standards you care for, but none of that changes the fact that it will generally only apply to a fraction of the population, and the applicability of the curve to a given individual will change over time; both effects limit the usefulness of those curves. As to why those "standards" are recognized by ISO and not by the BIPM, as I said, you'd have to as the BIPM. | |
| Dec 7, 2017 at 13:27 | comment | added | MaudPieTheRocktorate | There is "Equal-Loudness contour" which seems to be the equivalent of the luminosity function for sound. There is also ISO 226:2003 which defines an Equal-Loudness contour. I did not read the details, but that this ISO document exists suggests that a standardized loudness may be defined. | |
| Dec 7, 2017 at 10:44 | history | answered | Emilio Pisanty | CC BY-SA 3.0 |