1. KIS – FRI ŽU Calculation of Packet Loss Impact for E-model Martin Klimo Department of InfoCom Networks University of Zilina Slovakia STQ Sophia Antipolis

2. KIS – FRI ŽU Overall Rating R E-model Ro - sources generating noise independently on the speech Is - all impairments which occur simultaneously with the speech Id - impairments caused by delay Ie - impairments caused by low bit rate codecs A - expectation factor Packet Loss ETSI Packet Loss

3. KIS – FRI ŽU Idea behind using of Is

4. KIS – FRI ŽU Signal reconstruction by LPC

5. KIS – FRI ŽU Zero sample stuffing Sample repeating 1-st order LPC Sample loss

6. KIS – FRI ŽU Is modification ITU-T Rec. G.107 Combining with packet loss on the subjective basis (ITU-T Rec. P.11)

7. KIS – FRI ŽU Example Packet Loss: zero stuffing, GI process, no compression no compression Rest Jitter: exponential distribution, play-out buffer, test signal play-out buffer, test signal

8. KIS – FRI ŽU Sample loss impact MOS=f(p) Q [dB] 5.0 4.5 4.0 3.5 3.0 2.5 2.0 1.5 1 4030 25 20 15 10 50 MOS Loss 10 - 1 10 - 2 10 - 3 10 - 4

9. KIS – FRI ŽU Sample loss impact R=f(p l ) Sample loss [%]

10. KIS – FRI ŽU Packet loss

11. KIS – FRI ŽU Bernoulli packet loss 1-st order LPC Burst length

12. KIS – FRI ŽU Forward masking

13. KIS – FRI ŽU Zero packet stuffing Bernoulli packet loss

14. KIS – FRI ŽU ETSI test

15. KIS – FRI ŽU ETSI TR 101 329-6 G.113 App.A Model MOS=f(p L )

16. KIS – FRI ŽU Model vs. E.155

17. KIS – FRI ŽU VoIP example Packet Loss