Emblaze-VCON xPointS User Manual download pdf (Page 20)

Evaluation of the Emblaze-VCON VCBPro Video Bridge

Participant Experience

From a meeting participant perspective, the VCBPro provided a solid meeting experience at all times.

Video images were on par with or better than other MCUs we’ve tested, and the system’s support for

wide-band audio provided solid audio performance throughout the testing.

The MCU-generated latency (delay) was measured to be ~ 90 ms

; a figure that was better (lower) than

expected considering the system’s use of standard PC components instead of dedicated DSPs and the fact

that all calls are transcoded.

When using a full screen (voice-activated) layout, the system’s switching was crisp and clean. When

using continuous presence layouts (2x2, 3x3, etc.), the experience was also as expected. However,

although the latency generated by the VCBPro was reasonably low, the inability to remove the local site

from the screen layout during continuous presence calls (a feature available from most other MCUs)

highlighted the call latency and detracted from the CP meeting experience.

Finally, we also noted some minor image clipping during mixed 4:3 and 16:9 calls; a problem also found

on other MCUs WR has evaluated.

Overall, thanks to improved connectivity and newly added transcoding capabilities, the call experience

provided by the VCBPro was significantly better than that provided by prior Emblaze-VCON video

bridges (and basically on-par with other leading MCUs).

To enable fair, apples-to-apples, comparison of the MCU generated latency of different video bridges, whenever

possible WR conducts its latency measurements at 384 kbps and using CIF / SIF video resolution.

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Emblaze-VCON xPointS User Manual Page 20