[e2e] question about the iLBC (VoIP)

Christian Hoene hoenech at informatik.uni-tuebingen.de
Fri Sep 23 09:00:22 PDT 2005

Dear Xiaoming Zhou,


you can calculate the Ie values from MOS values using the procedure given in
ITU P.830 and P.833:

1. iLBC MOS values for different packet loss rates are available from
GlobalIPsound or  <http://www.ilbcfreeware.org/>

2. Use the conversation formular given in ITU G.107 or in
http://www.tkn.tu-berlin.de/publications/papers/MOS_R2.pdf to calculate the
R factor. 

3. Subtract the R factors from the R0 value (93.2) to get the Id values.


Best regards,


 Christian Hoene




From: end2end-interest-bounces at postel.org
[mailto:end2end-interest-bounces at postel.org] On Behalf Of
X.Zhou at ewi.tudelft.nl
Sent: Donnerstag, 22. September 2005 10:05
To: end2end-interest at postel.org
Subject: [e2e] question about the iLBC (VoIP)

To examine the quality of VoIP, E-Model is often used. The output of the
E-model is a transmission ration factor R: R=R0-Is-Id-Ie+A, where R0
represents the basic signal-to-noise ration, Is represents the impairments
occurring simultaneously with the voice signal, Id represents the
impairments caused by delay, and Ie represents the impairments caused by

Is there any publication gives the Ie value for the codec iLBC?



Xiaoming Zhou



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