CONTENTS

 1     Scope
 2     Object
 3     Normative references
 4     Definitions
 5     Artificial ear types
        5.1     Type 1 – IEC 60318
        5.2     Type 2 – IEC 60711
        5.3     Type 3
                  5.3.1     Type 3.1 – Concha bottom simulator
                  5.3.2     Type 3.2 – Simplified pinna simulator
                  5.3.3     Type 3.3 – Pinna simulator
                  5.3.4     Type 3.4 – Pinna simulator (simplified)
        5.4     Calibration of the artificial ears Type 1 and Type 3.2
                  5.4.1     Performance testing of the IEC 60711 occluded-ear simulator (Type 3.2 only)
                  5.4.2     Frequency sensitivity response
                  5.4.3     Acoustic input impedance
        5.5     Performance verification of the artificial ears Type 2, Type 3.1, Type 3.3 and Type 3.4
        5.6     Atmospheric reference conditions
        5.7     General requirements
        5.8     DRP to ERP correction
Annex  A – A practical procedure for determination of the acoustic input impedance of artificial ears
        A.1     Introduction
        A.2     Calibration of the impedance probe
                  A.2.1     Frequency response of the probe microphone
                  A.2.2     Relative frequency response of the transmitter microphone
                  A.2.3     Absolute sensitivity of the transmitter microphone as a volume velocity source
        A.3     Artificial ear calibration
                  A.3.1     Determination of acoustical impedance
                  A.3.2     Determination of closed condition sound pressure sensitivity