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Updating and Interpreting the Speech Interference Level (SIL)

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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.

JAES Volume 18 Issue 2 pp. 114-118; April 1970
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AES - Audio Engineering Society