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