CONTENTS

 1     Introduction
 2     General
 3     Experiment design
 4     Selection of crew members and speech material
 5     Calibration of the IRS
 6     Circuit arrangements
 7     Recording of information
        7.1     Details of the test
        7.2     Individual balances
 8     Analysis
 9     Presentation of results
Annex A     –      Examples of experiment designs
Annex B     –      Selection of crew members, audiometric testing of subjects and speech material
        B.1     Crew members
        B.2     Audiometric testing of subjects – simple screening procedure
        B.3     Speech material
Annex C     –      Simplified statistical analysis
        C.1     Mean
        C.2     Standard deviation
Annex D     –      Direct loudness balance against the intermediate reference system (IRS) for the subjective determination of loudness ratings
        D.1     Introduction
        D.2     Method
References