Speech Interference Level

A calculated quantity providing a guide to the interference of a noise with the reception of speech. The speech-interference level is the arithmetic average of the octave band levels of the interfering noise in the most important part of the speech frequency range. The levels in octave bands centred at 500, 1000, and 2000 Hz are commonly averaged to determine the speech-interference level.

For reference:
57dB(A) at 1m = normal voice
65dB(A) at 1m = raised voice
74dB(A) at 1m = very loud voice
82dB(A) at 1m = shout
88dB(A) at 1m = maximum effort

See also: Privacy Index, Speech Intelligibility, Speech Transmission Index.

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