Foreword

Introduction

1Scope

2Normative references

3Terms and definitions

4Measurement conditions

4.1Test room

4.2Test specimen

4.3Equipment

4.3.1Sound source

4.3.2Measurement equipment

4.4Microphone positions

5Determination of level reduction

5.1Test method

5.2Level reduction

5.3Determination of speech level reduction

5.4Precision

5.5Typical values

5.6Application in room acoustic simulations

6Information to be recorded and reported

6.1General

6.2Test environment and test specimen

6.3Instrumentation

6.4Acoustical data

Annex AExample of the calculation of the main test results (informative)

Annex BExample of presentation of the main test results (informative)

Annex CPrecision (informative)

Annex DExamples of the values of speech level reduction (informative)

Annex EApplication of the results in room acoustic design (informative)

Bibliography