CONTENTS

 1     Scope
 2     References
 3     Definitions and abbreviations
 4     Efficiency of protection again excessive acoustic pressure
        4.1     Efficiency of protection against short duration impulses
        4.2     Efficiency of protection against longer duration disturbances
 5     Effect on normal speech signals
Annex A – Basis for the determination of the limits for the acoustic pressure
        A.1     Acoustic limits
                  A.1.1     Longer duration disturbances
                  A.1.2     Short duration impulses
        A.2     Time duration discrimination
        A.3     Calculation of the limits