Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Descriptions of speech communications
4.1 General
4.2 Speaker
4.3 Transmission channel
4.4 Listener
5 Performance of speech communications
5.1 General
5.2 Alert and warning situations
5.3 Person-to-person communications
5.4 Public address in public areas
5.5 Personal communication systems
5.6 Summary of recommended minimum performance
6 Assessment and prediction
6.1 General
6.2 Subjective assessment methods
6.3 Objective assessment and prediction methods
Annex A (normative) Speaker and listener characteristics
Annex B (informative) Subjective speech-intelligibility
tests
Annex C (informative) Speech transmission index, STI
Annex D (informative) Overview of the means of
communication and related parameters
Annex E (normative) Speech interference level, SIL
Annex F (informative) Intelligibility ratings for
speech communications
Annex G (normative) Definition of symbols
Annex H (informative) Examples of applications of
predictive intelligibility methods
Bibliography