Manufacturer's Response - Tandberg C60
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1. Camera Focus
The auto focus sometimes became disorientated and locked out of focus requiring the camera to be moved to enable the auto focus to re-engage.
Tandberg:
We have experienced some of the same problems, and there have been improvements in the autofocus algorithms of the camera (software upgraded from the codec). Please note that in order to increase the lifespan of the camera (focus engine) and increase quality of the image, the autofocus function is turned off automatically after each movement of the camera.
2. Camera Missing Pixels
It was noticed that cameras at both sites suffered from a significant number of "missing pixels" due to dead pixels on the camera pick up device. This was very noticeable on "Self-view" in low light areas of the image, and showed as large white dots on the camera image.
Tandberg:
The pixel correction algorithm has been corrected and upgraded and will be released with software release 1.2.0 (June 2009). At the same time we have improved the brightness of the overall image quality from the camera.
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3. HDMI Main Monitor Signal
Using the HDMI input on the main monitor the displayed image exhibited a degree of image ‘cropping’ dependant on the resolution setting for that monitor signal.
| 1366x768 and below | Minimal cropping |
| 1280x720 | 50% cropping of the soft keys vertically, legends unreadable |
| 1920x1080 | 75% cropping of the soft keys vertically, legends unreadable |
If however the main output of the C60 CODEC was connected to the DVI input of the same monitor no cropping was experienced at these resolutions. The monitors in use for the tests were Dell 2709Wb. There appeared to be a degree of "over-scan" on the HDMI monitor input even though the edge of the active image was visible on the monitor.
Tandberg:
It is a known limitation of certain monitors that they are overscanning images hence cropping the image in emulating the old tube monitors. The HDMI output from the C60 follows standards based signalling for all formats supported. You might find a PC setting/Pixel-by-Pixel setting to prevent the monitor from cropping the image.
4. Analogue Component Input
No analogue component to DVI cable or suitable adaptor was supplied with the system but we attempted to connect an analogue component Y Pb Pr signal to the CODEC using standard component to DVI cables. Unfortunately this was unsuccessful using either DVI input.
Tandberg:
This should be working. It could be a problem detecting YPbPr automatically. You can force component through the menu or API.
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5. 1080p Video Quality
At 720p resolution the signals transmitted from the Tandberg HD cameras across the conference link between C60 systems was excellent. At 1080p however the image movement appeared "jerky".
Tandberg:
Network quality (Jitter and packet loss), Framerate, resolution and BW are important aspects evaluating quality. Ideal BW for 1080p30 will range from 2-6Mb depending on movement in the picture. We have also seen that our encoder running 1080p in version 1.1.0 would drop frames even though the current bandwidth limitation is not met. We are working to improve the overall video quality with content and camera so we expect improvements in 1080p quality as well as 720p quality.
The next major release later this year will contain some important updates:
Improved 1080p and full 720p 60 frames per second running at the same BW as 1080p30. This will apply to both main stream and dual stream (also at the same time).
6. IP Configuration
There were no problems connecting between the Tandberg C60 units at Edinburgh and Newcastle over IP however the system at Newcastle lost its IP configuration four times during the evaluation period.
Tandberg:
We do not have any known problems that might cause this to happen. This would need further investigation.
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7. H.239 Transmitted Resolution
We did experience some problems in H.239 connections from the C60 to other systems:
| CODEC | H.239 Resolution Transmitted by the C60 |
| Polycom® VS4000 | H.239 not supported |
| Tandberg 6000 Classic (B version hardware) |
800 x 600 |
| Polycom® VSX8000 | 1024 x 768 |
| Tandberg 990 MXP | 510 x 288 |
| Tandberg Edge 95 | 510 x 288 |
| Tandberg 6000 MXP | 510 x 288 |
| Polycom HDX 9002 | 1280 x 20 510 x 288 |
| Lifesize Team | 1280 x 720 |
In calls to the Tandberg 990 MXP, 6000 MXP and Edge 95 the presentation resolution transmitted from the C60 was 510x288, in calls to the Polycom HDX 9002 it was intermittent and alternated between 510x288 and 1280x720.
Tandberg:
The resolution transmitted from a C series codec to MXP systems was limited to 288 due to a bug in pre-F8 MXP software. This bug is resolved in F8 software.
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