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Latency Vista
Latency Vista
Latency Vista
Latency Vista
Latency Vista
Latency Vista
Latency Vista
Latency Vista
Latency Vista
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Latency Vista

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Video conferencing latency measurement

Video conferencing latency measurement

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  • 1. Latency Measurement Vista review Feb 27, 2007 Don Welch Video Test Methodologies
  • 2. Signal processing
  • 3. September Results Calibration Studio Characterizations <ul><li>Results: </li></ul><ul><li>Measurements Delta Time (ms) </li></ul><ul><li>E-H (Cal Studio to Monster B) ~ 580 ms / 290 (one way): 270 (JT) </li></ul><ul><li>Learning: </li></ul><ul><ul><li>Fiber optic light guide makes can replace a mirror </li></ul></ul>
  • 4. Halo Encode to Halo Decode (Corvallis - Tokyo) <ul><li>960 RTT / 480 one way </li></ul><ul><li>Learning: </li></ul><ul><ul><li>One way delay can be deduced from RTT (Round Trip delay Time). This was unknown to Sachs-Goldman (would buy it from us!) </li></ul></ul>
  • 5. FPGA Option <ul><li>Initial algorithm development on FPGA Implementation w/ Spartan 3E Starter Kit: $149 board . </li></ul><ul><li>Development platform where learning can be applied for other pipeline functions. </li></ul><ul><li>Flexible- USB, RS232, IP interfaces. </li></ul><ul><li>Real-time requirements met for high resolution signal processing. </li></ul>
  • 6. Initial concept evaluated <ul><li>System pipeline from camera to Pericles through gig-switch to VLC on a separate PC. </li></ul>
  • 7. September Collaboration Characterizations <ul><li>Results: </li></ul><ul><li>Measurements Time (ms) Signal Type </li></ul><ul><li>BC 10L or 4U 96 ms Laptop-Colab </li></ul><ul><li>BC 10L to 4U 118 ms Laptop-Colab </li></ul><ul><li>BC 10L to Palo Alto 127 ms Laptop-Colab </li></ul><ul><li>BC 10L to 4U to Bristol 170 ms Laptop-Colab </li></ul><ul><li>Learning: </li></ul><ul><ul><li>Flashing Power Point works </li></ul></ul><ul><ul><li>As rooms are added the delay grows </li></ul></ul>
  • 8.  
  • 9. Embedded Solution

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