ДСТУ EN IEC 60268-16:2022 Оборудование звуковых систем. Часть 16. Объективная оценка разборчивости языка по индексу передачи языка (EN IEC 60268-16:2020, IDT; IEC 60268-16:2020, IDT)

ДСТУ EN IEC 60268-16:2022
(EN IEC 60268-16:2020, IDT; IEC 60268-16:2020, IDT)

Обладнання звукових систем. Частина 16. Об’єктивне оцінювання розбірливості мови за індексом передавання мови

 
   
 
 
     
Не є офіційним виданням.
Офіційне видання розповсюджує національний орган стандартизації
(ДП «УкрНДНЦ» http://uas.gov.ua)

Contents

FOREWORD

INTRODUCTION

1 Scope

2 Normative references

3 Terms and definitions

4 Description of the STI model

4.1 Overview

4.2 Applicability of the STI model

4.3 Theoretical details

4.3.1 Envelope function and envelope spectrum

4.3.2 Reduction of modulation

4.3.3 Role of the octave-band noise carriers

4.3.4 Theoretical overview

4.4 Measurement of STI

4.4.1 Direct and indirect methods

4.4.2 Full STI

4.4.3 STIPA

4.4.4 Choice of method

5 Direct method of measuring STI — User guidance

5.1 Overview

5.2 STIPA

5.3 Application

5.4 Limitations

6 Indirect method of measuring STI (impulse response) — User guidance

6.1 Overview

6.2 Application

6.3 Limitations (non-linear distortion)

7 Limitations of the STI model

7.1 General

7.2 Frequency shifts

7.3 Centre clipping

7.4 Dropouts

7.5 Jitter

7.6 Digital voice compression systems

7.7 Overestimation of STI under low background noise conditions

7.8 Frequency response

7.9 Echoes

7.10 Fast amplitude compression and expansion

7.11 Non-linear distortion

7.12 Hearing impaired listeners

7.13 Impulsive and fluctuating noise

7.14 Conclusion

8 Measurement procedures, post-processing of data and applications

8.1 General

8.2 Acoustical input

8.3 Acoustical output

8.4 Electrical input

8.5 Electrical output

8.6 Examples of input/output combinations

8.7 Spatial averaging of STI measurements

8.8 Post-processing of measured MTF data

8.9 Issues concerning noise

8.10 Analysis and interpretation of the results

8.11 Binaural STI measurements

9 Use of the STI as a design prediction tool

9.1 Overview

9.2 Statistical predictions

9.3 Prediction from simulated impulse response

Annex A (informative) The basis of the STI concept

Annex B (normative) STIPA method

Annex C (normative) Verification of STI measuring devices

Annex D (informative) Use of STI measuring devices

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) Setting and adjustment of STI test signal level

Annex K (informative) Example test report sheet for STI measurements

Annex L (normative) Prediction of the STI using statistical methods

Annex M (informative) Adjustments to STI data to simulate alternative ambient noise spectra and different speech levels

Annex N (informative) Other methods of determining speech intelligibility

Annex O (informative) Alternative direct methods for measuring Full STI

Annex P (normative) Information to be provided by manufacturers

Annex Q (informative) Effect of uncertainties of selected parameters on STI uncertainty

Bibliography