Table of Contents

 1     Scope          
 2     References
 3     Definitions 
        3.1     Terms defined elsewhere        
        3.2     Terms defined in this Recommendation            
 4     Abbreviations and acronyms             
 5     Conventions             
 6     The E-model, a computational model for use in transmission planning           
        6.1     Introduction   
 7     Structure and basic algorithms of the E-model          
        7.1     Calculation of the transmission rating factor, R
        7.2     Basic signal-to-noise ratio, Ro 
        7.3     Simultaneous impairment factor, Is     
        7.4     Delay impairment factor, Id     
        7.5     Equipment impairment factor, Ie          
        7.6     Advantage factor, A    
        7.7     Default values               
Annex A – Conditions of using the E-model    
        A.1     Examples of conditions where caution must be exercised when using the E‑model      
        A.2     Conditions for which the performance of the E-model has been improved by updating from the earlier version    
Annex B – Quality measures derived from the transmission rating factor R    
Appendix I – Calculation of R from MOSCQE values    
Appendix II – Provisional impairment factor framework for wideband speech transmission    
Appendix III – Reference implementation of the E-model in ITU-T G.107    
Appendix IV – Use of the E-model in conjunction with noise reduction or echo canceller systems in the network or the terminal equipment