post production feature
miserable viewing experience if not applied correctly. Automation systems can be tricky
in the 3D environment as virtually everything tied to the system is doubled. The deployment grows in complexity as the playout automation operation expands. At its core, the playout element must control two signals simultaneously in a frame accurate manner. This translates to dual, synchronized playlists. Secondary events related to channel branding elements must also be properly supported across the two playlists. 3D test and measurement has
come a long way in a short period of time. An array of reliable tools and solutions exist to help the 3D broadcaster identify signal quality issues. Scopes with left and right waveform displays and performance tests for luminance/chrominance and position measurement will ensure that viewers receive the best possible 3D picture. Format considerations represent the
final stage in the broadcast facility. Every destination needs to be considered (typically cable and satellite at this point). The system requesting two full HD streams makes
life easier for the broadcaster as it is simply a continuation of the broadcast facility workflow process. A more significant challenge is
presented when the operator requires an encoded signal in a frame- compatible format, such as side-by- side or over-under. This requires an additional synchronizer and/or converter to perform the task. If required, it makes sense to integrate a unit that can output the 3D signal over HDMI. This provides a final QC stage, enabling display on 3D television sets similar to those the end user would be using.
Impacts of various approaches to 3D
The ideal approach is to two full- resolution images as far through the chain as possible. Unfortunately, this is not always practical. Since there are three primary approaches to implementing 3D in the plant (frame compatible, two full-res feeds over 1.5Gb/s, and two full-res feeds over a single 3Gb/s), it’s helpful to understand the impacts of each. Table 1 serves as a handy quick
reference guide to the impacts of each approach that can be used.
Figure 1: Router control system selecting 3D modes for simultaneous left/right switching.
Conclusion
The 3D television workflow is essentially an ecosystem - a suite of interoperable components that complete a cycle for advanced broadcasting. It makes sense to look at the complete picture from acquisition to transmission instead of addressing single point products one at a time. This strategy will be sure to minimise problems as you move forward with a 3D channel launch.
www.ibeweb.com l september/october 2011 l ibe l 61
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