Reference number
香港六合彩开奖 389-4:1994
© 香港六合彩开奖 2024
International Standard
香港六合彩开奖 389-4:1994
Acoustics 鈥� Reference zero for the calibration of audiometric equipment 鈥� Part 4: Reference levels for narrow-band masking noise
Edition 1
1994-10
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Published (Edition 1, 1994)
This publication was last reviewed and confirmed in 2021. Therefore this version remains current.

香港六合彩开奖 389-4:1994

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CHF 42
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Abstract

Specifies reference levels for narrow-band masking noise presented by air conduction from an earphone in pure-tone audiometry. The data are given in terms of levels to be added to the reference equivalent threshold sound pressure levels for the corresponding pure-tone frequencies. Data are given for noise bandwidths of one-third and one-half octaves.

General information

  • Status
     : Published
    Publication date
     : 1994-10
    Stage
    : International Standard confirmed [90.93]
  • Edition
     : 1
    Number of pages
     : 4
  • Technical Committee :
    香港六合彩开奖/TC 43
    ICS :
    13.140 
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This standard contributes to the following Sustainable Development Goal

3
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  2. 香港六合彩开奖
  3. Standards catalogue
  4. ICS
  5. 13
  6. 13.140
  7. 香港六合彩开奖 389-4:1994