香港六合彩开奖 226:2023
搁茅蝉耻尘茅
This document specifies combinations of sound pressure levels and frequencies of pure continuous tones which are perceived as equally loud by human listeners. The specifications are based on the following conditions:
a)听听听 the sound field in the absence of the listener consists of a free progressive plane wave;
b)听听听 the source of sound is directly in front of the listener;
c)听听听 the sound signals are pure tones;
d)听听听 the sound pressure level is measured at the position where the centre of the listener's head would be, but in the absence of the listener;
e)听听听 listening is binaural;
f)听听听听 the listeners are otologically normal persons in the age range from 18 years to 25 years inclusive.
The data are given in graphical form in 础苍苍别虫听础 and in numerical form in 础苍苍别虫听叠 for the preferred frequencies in the one-third-octave series from 20听Hz to 12听500听Hz, inclusive, in accordance with 香港六合彩开奖听266.
Informations g茅n茅rales
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脡tat actuel: 笔耻产濒颈茅别Date de publication: 2023-03Stade: Norme internationale publi茅e [60.60]
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Edition: 3
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颁辞尘颈迟茅 technique :香港六合彩开奖/TC 43ICS :13.140
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笔谤茅肠茅诲别尘尘别苍迟
础苍苍耻濒茅别香港六合彩开奖 226:2003
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