Table of Contents

FOREWORD
INTRODUCTION
1 Scope
2 Normative references
3 Terms and definitions
4 Description of the STI method
5 Direct method of measuring STI
6 Indirect method of measuring STI using the impulse
  response
7 Measurement procedures, post-processing of data
  and applications
8 Use of STI as a design prediction tool
Annex A (normative) - Speech transmission index
        (STI) and revised STI methods
Annex B (normative) - STIPA method
Annex C (normative) - STITEL method
Annex D (informative) - RASTI method (obsolete)
Annex E (informative) - Qualification of the STI and
        relationships with other speech intelligibility
        measures
Annex F (informative) - Nominal qualification bands for STI
Annex G (informative) - Examples of STI qualification bands
        and typical applications
Annex H (informative) - Non-native listeners
Annex I (informative) - Effect of age-related hearing loss
        and hearing impairment on speech intelligibility
Annex J (normative) - Calibration of STI test signal level
Annex K (informative) - Example test report sheet for STI
        measurements
Annex L (normative) - Prediction of STI using statistical
        methods
Annex M (informative) - Adjustments to measured STI
        and STIPA results for simulation of occupancy
        noise and different speech levels
Annex N (informative) - Other methods of determining
        speech intelligibility
Bibliography

Abstract

Describes objective methods for rating the transmission quality of speech with respect to intelligibility.

General Product Information

Published
Document Type	Standard
Status	Current
Publisher	International Electrotechnical Committee
Pages
ISBN
Committee	TC 100
Supersedes	96/210024 DC : AUG 96 IEC 60089 : 1957