In line with new standard frequency limits on octave band filters, a new preferred frequency SIL (PSIL) based on octaves centered at 500, 1000, and 2000 Hz is proposed. The relation to, and interpretation of PSIL, in terms of the old SIL, A-weighted sound levels and other measures of noise are discussed.
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https://aes2.org/publications/elibrary-page/?id=1519
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