CEI EN 60268-16 : 2012

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

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