Section 4 Preferred Speech Interference Level
Clasification Society 2024 - Version 9.40
Clasifications Register Guidance Information - Ship Vibration and Noise Guidance Notes - Chapter 9 Audible alarms and public address systems - Section 4 Preferred Speech Interference Level

Section 4 Preferred Speech Interference Level

4.1 The Preferred Speech Interference Level (SIL) is the arithmetic average of background noise in the 500, 1000, 2000 and 4000 Hz bands, measured in dB re 20 µPa.

Parent topic: Chapter 9 Audible alarms and public address systems
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