EN 60268-16:2011

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
Annex ZA (normative) - Normative references to
         international publications with their
         corresponding European publications

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