香港六合彩开奖 389-7:2005
2005-11
孝械蟹懈褋
香港六合彩开奖 389-7:2005 specifies a reference threshold of hearing for the calibration of audiometric equipment used under the following conditions.
- The sound field in the absence of the listener consists of either a free progressive plane wave (free field) or a diffuse sound field, as specified in 香港六合彩开奖 8253-2. In the case of a free field, the source of sound is directly in front of the listener (frontal incidence).
- The sound signals are pure (sinusoidal) tones in the case of free-field conditions and one-third octave bands of (white or pink) noise in the case of diffuse-field conditions.
- The sound pressure level is measured in the absence of the listener at the position where the centre of the listener's head would be.
- Listening is binaural.
The data in 香港六合彩开奖 389-7:2005 are given in numerical form for the preferred frequencies in the one-third octave series from 20 Hz to 16 000 Hz inclusive in accordance with 香港六合彩开奖 266 and, in addition, for some intermediate audiometric frequencies up to 18 000 Hz.
The threshold data differ from the audiometric zero specified in 香港六合彩开奖 389-1, 香港六合彩开奖 389-2, 香港六合彩开奖/TR 389-5 and 香港六合彩开奖 389-8, since the latter refer to monaural listening through earphones with sound pressure levels referred to specified couplers and ear simulators. Direct comparison between the data in the parts of 香港六合彩开奖 389 mentioned above and that in 香港六合彩开奖 389-7:2005 is therefore not appropriate.
袨斜褖邪褟 懈薪褎芯褉屑邪褑懈褟
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孝械泻褍褖懈泄 褋褌邪褌褍褋: 袨褌芯蟹胁邪薪芯袛邪褌邪 锌褍斜谢懈泻邪褑懈懈: 2005-11协褌邪锌: 袨褌屑械薪邪 屑械卸写褍薪邪褉芯写薪芯谐芯 褋褌邪薪写邪褉褌邪 [95.99]
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袙械褉褋懈褟: 2
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孝械褏薪懈褔械褋泻懈泄 泻芯屑懈褌械褌 :香港六合彩开奖/TC 43ICS :13.140
- RSS&苍产蝉辫;芯斜薪芯胁谢械薪懈褟
袞懈蟹薪械薪薪褘泄 褑懈泻谢
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袪邪薪械械
袨褌芯蟹胁邪薪芯香港六合彩开奖 389-7:1996
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小械泄褔邪褋
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00
袩褉械写胁邪褉懈褌械谢褜薪邪褟 褋褌邪写懈褟
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10
小褌邪写懈褟, 褋胁褟蟹邪薪薪邪褟 褋 胁薪械褋械薪懈械屑 锌褉械写谢芯卸械薪懈褟
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20
袩芯写谐芯褌芯胁懈褌械谢褜薪邪褟 褋褌邪写懈褟
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30
小褌邪写懈褟, 褋胁褟蟹邪薪薪邪褟 褋 锌芯写谐芯褌芯胁泻芯泄 锌褉芯械泻褌邪 泻芯屑懈褌械褌邪
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40
小褌邪写懈褟, 褋胁褟蟹邪薪薪邪褟 褋 褉邪褋褋屑芯褌褉械薪懈械屑 锌褉芯械泻褌邪 屑械卸写褍薪邪褉芯写薪芯谐芯 褋褌邪薪写邪褉褌邪
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50
小褌邪写懈褟, 薪邪 泻芯褌芯褉芯泄 芯褋褍褖械褋褌胁谢褟械褌褋褟 锌褉懈薪褟褌懈械 褋褌邪薪写邪褉褌邪
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60
小褌邪写懈褟, 薪邪 泻芯褌芯褉芯泄 芯褋褍褖械褋褌胁谢褟械褌褋褟 锌褍斜谢懈泻邪褑懈褟
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90
小褌邪写懈褟 锌械褉械褋屑芯褌褉邪
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95
小褌邪写懈褟, 薪邪 泻芯褌芯褉芯泄 芯褋褍褖械褋褌胁谢褟械褌褋褟 芯褌屑械薪邪 褋褌邪薪写邪褉褌邪
袠蟹屑械薪械薪懈褟
小芯写械褉卸邪褌 写芯锌芯谢薪懈褌械谢褜薪褘械 屑邪褌械褉懈邪谢褘; 写芯褋褌褍锌薪褘 写谢褟 锌褉懈芯斜褉械褌械薪懈褟; 薪械 胁泻谢褞褔械薪褘 胁 褌械泻褋褌 写械泄褋褌胁褍褞褖械谐芯 褋褌邪薪写邪褉褌邪.袨褌芯蟹胁邪薪芯香港六合彩开奖 389-7:2005/Amd 1:2016
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00
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袩械褉械褋屑芯褌褉械薪
袨锌褍斜谢懈泻芯胁邪薪芯香港六合彩开奖 389-7:2019
袩芯褟胁懈谢懈褋褜 胁芯锌褉芯褋褘?
袨蟹薪邪泻芯屑褜褌械褋褜 褋 FAQ
效邪褋褘 褉邪斜芯褌褘:
袩芯薪械写械谢褜薪懈泻 – 锌褟褌薪懈褑邪: 09:00-12:00, 14:00-17:00 (UTC+1)