Telephones in Noisy Areas

Using telephones in noisy areas - satisfactory, difficult and impossible noise levels

Background noise interferes with telephone conversations, where

• 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)

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