13
sent as an H.239 channel sharing the bandwidth with the main camera showed some
degradation but was still very good. Only when the bandwidth was reduced to
2Mbit/s did the PC image on the H.239 channel became significantly degraded with
blocky and blurry artefacts. The ability of the system at 4Mbit/s to transmit two
video images simultaneously at both high resolution and frame rates was first class.
The Radvision standard 1080p 30 camera, while executing both pan and tilt
functions smoothly, did have a tendency on wide angle shots to hunt for focus. The
auto iris also tended to over expose even in a controlled lighting environment.
F:
AUDIO TESTS SUMMARY
Setup
The echo canceller is fully automatic in operation. The quality of echo
cancellation and doubletalk from the system was excellent.
Lecture Theatre Room
Audio levels adequate? (Yes/no)
Not tested
Yes
Audio quality acceptable? (Yes/no)
Not tested
Yes
Echo cancellation acceptable?
(Yes/no)
Not tested
Yes
Quality of double talk
Not tested
Excellent
G:
DATA TESTS
A PC may be directly connected to the CODEC via the DVI-I interface.
H:
CONNECTIVITY
H.323
There were no problems connecting between the SCOPIA XT1000 units over IP.
Time to Connect with encryption On
H.323
All speeds
<1 seconds
During an H.323 call the network connection was removed and reconnected after a
specific time.
5 Seconds
Picture froze – successful reconnection, call does not terminate
15 Seconds
Picture froze – successful reconnection, call does not terminate
30 Seconds
Picture froze – successful reconnection, call does not terminate
55 Seconds
Picture froze – call terminates after 45 seconds
