Remerciez-le!

Remerciez @Admin pour avoir partagé cet document gratuitement, de la manière la plus simple, en partageant sur les réseaux sociaux.

Iec 60268 16 This is a preview - click here to buy the full publication INTERNATIONAL STANDARD IEC - Edition - NORME INTERNATIONALE Sound system equipment ?? Part Objective rating of speech intelligibility by speech transmission index Equipements pour sys

This is a preview - click here to buy the full publication INTERNATIONAL STANDARD IEC - Edition - NORME INTERNATIONALE Sound system equipment ?? Part Objective rating of speech intelligibility by speech transmission index Equipements pour systèmes électroacoustiques ?? Partie Evaluation objective de l'intelligibilité de la parole au moyen de l'indice de transmission de la parole INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE ICS Registered trademark of the International Electrotechnical Commission Marque déposée de la Commission Electrotechnique Internationale XB PRICE CODE CODE PRIX ISBN - - - - CThis is a preview - click here to buy the full publication ?? ?? F D - IEC CONTENTS FOREW ORD INTRODUCTION Scope Normative references Terms and de ?nitions Description of the STI method General Rationale for the STI method Applicability of the STI method Background of the STI method General Theoretical overview Measurement of STI Applicability of STI test methods Use of direct and indirect methods Limitations of the STI method General Frequency shifts Centre clipping Drop outs Jitter Vocoders Overestimation of STI under low background noise conditions Frequency response Echoes Fast amplitude compression and expansion Non-linear distortion Impulsive and uctuating noise Hearing impaired listeners Conclusion Direct method of measuring STI Overview STIPA Application Limitations Indirect method of measuring STI using the impulse response Overview Application Limitations non-linear distortion Measurement procedures post-processing of data and applications General Acoustical input Acoustical output Electrical input Electrical output Examples of input output combinations CThis is a preview - click here to buy the full publication F D - IEC ?? ?? Acoustical input ?? Acoustical output Electrical input ?? Electrical output e g assessment of wired and wireless communication systems Acoustical input ?? Electrical output e g assessment of microphones Electrical input ?? Acoustical output e g assessment of PA systems Post- processing of measured MTF data Issues concerning noise General Measurement of background noise Fluctuating noise Analysis and interpretation of the results Binaural STI measurements Use of STI as a design prediction tool Overview Statistical predictions Prediction from simulated impulse response 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 Quali ?cation of the STI and relationships with other speech intelligibility measures Annex F informative Nominal quali ?cation bands for STI Annex G informative Examples of STI quali ?cation bands and typical applications Annex H informative Non-native listeners Annex I informative E ?ect 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 di ?erent speech levels Annex N informative Other methods of determining speech intelligibility Bibliography Figure ?? Concept of the reduction in modulation due to a transmission channel Figure ?? Modulation transfer function ?? Input output comparison