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Subjective Tests Results

Subjective Tests Results. Degradation Category Rating of Scaled Speech. Three short network traces with different jitter statistics

clinton-sullivan
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Subjective Tests Results

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  1. Subjective Tests Results

  2. 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

  3. 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                 

  4. 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

  5. ACR Results Quality ScoreExcellent      5 Good           4 Fair             3 Poor            2 Bad             1 Late Loss Rate (%) 8.5/2.8 5.0/0 2.6/0.3 5.1/1.1 Link Loss Rate (%) 0 8.6 0 0 Burst Loss Rate (%) 6.0/0.7 4.1/0 0.6/0 3.9/0

  6. Traces and MOS Scores

  7. Playout Algorithms and TCP Window Size Control

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

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