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Telephone use in Noisy Areas

Use of telephone in noisy areas - satisfactory, difficult and impossible noise levels

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Background noise interferes with telephone conversations, and

  • conditions are satisfactory at levels less than 65 SIL (dB) (approx. 72 dBA)
  • conditions are difficult at levels in the range 65 - 80  SIL (dB) (approx. 72 - 87 dBA)
  • conditions are impossible at levels above 80  SIL (dB) (approx. 87 dBA)

SIL - Speech Interference Levels

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  • en: telephone noise noisy dbA sil
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