SIL - Speech Interference Levels

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Speech Interference Levels - SIL - are the arithmetic average of sound pressure levels at the 500, 1000 and 2000 Hz center frequencies and is a measure of the degree to which background noise interferes with speech.

• (1 ft, foot) = (0.3048 m)

The diagram above indicates the SIL and distance at which a person would have talk in a normal, raised, very loud or shouting voice to be understood.

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