SOUND SYSTEM EQUIPMENT - PART 16: OBJECTIVE RATING OF SPEECH INTELLIGIBILITY BY SPEECH TRANSMISSION INDEX
International Electrotechnical Committee
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
Describes objective methods for rating the transmission quality of speech with respect to intelligibility.
| Document Type | Standard |
| Status | Current |
| Publisher | International Electrotechnical Committee |
| Committee | TC 100 |
| Supersedes |
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