Table 2: Audiometric hearing thresholds of normal ears: conversion of dB SPL
into dB HL
(Extracted from ISO, 2003)
Pure-tone audiometric thresholds are expressed in dB HL (hearing level). The differences between dB HL and dB SPL, arise from isophonic curves.
| Frequency [Hz] |
dB SPL |
dB HL |
| 250 |
12 |
0 |
| 500 |
> 5 |
0 |
| 1000 |
2 |
0 |
| 2000 |
- 2 |
0 |
| 4000 |
- 5 |
0 |
| 8000 |
13 |
0 |
Source: SCENIHR,
Potential health risks of exposure to noise from personal music players and mobile phones including a music playing function (2008)
,
3.3.3.3, Page 18
Related publication:
Other Figures & Tables on this publication:
Figure 1*: Normal equal-loudness-level contours for pure tones under free-field
listening conditions
Figure 2: The prevalence of hearing impairment
Figure 3: Estimated units sales in EU of all portable audio devices and MP3 devices over the period 2004–2007,
Figure 4: The number of unit sales for all portable audio devices for the ten countries and for the EU,
Figure 5: Number of unit sales (in thousands) for CD and MP3 devices in ten European countries* between 2001 and 2007
Figure 6: Cumulative numbers of MP3 players and all portable audio equipment in the EU
Figure 7: Percentage of each portable audio device sold in 2004-2007
Figure 8: Percentage of each portable audio device sold in 2007 and the estimated number of units sold in EU
Table 1: Examples of sound pressure levels in relation to hearing threshold and pain threshold (in dB SPL)The range of human ear’s audible sounds goes from 0 dB SPL (hearing threshold) to 120-140 dB SPL (pain threshold)
Table 2: Audiometric hearing thresholds of normal ears: conversion of dB SPL
into dB HL (Extracted from ISO, 2003)
Pure-tone audiometric thresholds are expressed in dB HL (hearing level). The differences between dB HL and dB SPL, arise from isophonic curves.
Table 3: The examples of equivalent time-intensity levels referred to the
action levels
according to the Directive 2003/10/EC
Table 4: World Health Organisation Grades of Hearing Impairement (WHO, 2008)
Low and high-pitched sounds appear less loud to the human ear
EU Action levels for noise protection at work
Table 5: Noise Induced Hearing Loss (NIHL) predicted from ISO 1999 as a function of noise exposure level for 45 years (adapted from Lutman et al. 2008) Extent of
hearing loss to be expected from a working lifetime of 45 years at daily
continuous noise levels of 80, 85, 90 and 95 dB(A).
Table 6 : Noise Induced Hearing Loss (NIHL) predicted from ISO 1999 as a function of noise exposure level for 3 years (adapted from Lutman et al. 2008) Extent of hearing
loss to be expected from a shorter exposure duration of 3 years at daily
continuous noise levels of 80, 85, 90 and 95 dB(A).
