Oct. 18, 2000 Subjective Tests Results Yi Liang Degradation Category Rating of Scaled Speech Three short network traces with different jitter statistics.

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Presentation transcript:

Oct. 18, 2000 Subjective Tests Results

Yi Liang Degradation Category Rating of Scaled Speech Three short network traces with different jitter statistics Six samples are simulated over each trace; Samples are given and evaluated in pairs, in the format of “reference sample – processed sample” to provide higher sensitivity Eleven people participated the tests so far Score for each condition is obtained by averaging 6x11 ratings

Yi Liang DCR Results 5 Degradation is inaudible 4 Degradation is audible but not annoying 3 Degradation is slightly annoying 2 Degradation is annoying 1 Degradation is very annoying

Yi Liang Absolute Category Rating Four network traces with different jitter/loss statistics Four samples are simulated over each trace using two different playout scheduling algorithms (4x2 conditions) Score for each condition is obtained by averaging all the ratings

Yi Liang ACR Results Quality Score Excellent 5 Good 4 Fair 3 Poor 2 Bad 1 Late Loss Rate (%) 8.5/ /0 2.6/ /1.1 Link Loss Rate (%) Burst Loss Rate (%) 6.0/ /0 0.6/0 3.9/0 MNRU10 dB18 dB24 dB30 dBSource MOS

Yi Liang Traces and MOS Scores

Yi Liang Playout Algorithms and TCP Window Size Control Playout Algorithm TCP Window Size Max Jitter (ms) Avg Buffer Delay (ms) Late Loss Rate (%) Burst Loss Rate (%) Sound Samples

Yi Liang Different Algorithms with Different TCP Window Size Window Size =32Window Size =4 Alg. 2 Alg. 3