Grass Valley Imagestore 750 v.3.0.1 - Manual (Page 35)

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Imagestore 750
User Manual
Fig. 3-5: In-Stream Branding
This scenario combines the advantages of both “fill/key branding insertion” and “downstream
branding insertion.” The Imagestore 750 acts as a robust bypass for the Intuition XG. If the Intu-
ition XG ever fails, the Imagestore 750 keyer receiving Intuition XG graphics is cut down and an
unbranded (or lightly-branded) version of the original video source will continue to be output
without any break in signal integrity.
Agile Audio Handling
Video sources feeding the Imagestore 750 can have different input audio configurations, some
including Dolby data and others, PCM audio. To maintain a constant output audio mapping as
the A and B inputs switch between different router sources (or sources change audio format
dynamically), the Imagestore 750 mixes between different audio configurations by selectively
using Dolby decode, up-mix and Dolby encode audio modules.
Example 1
In this example, sources that feed the Imagestore 750 inputs will always be in one of two
possible audio formats: 5.1 PCM + 2.0 PCM and 5.1 Dolby E + 2.0 PCM.
The two input audio streams are passed into Dolby E decoders which dynamically convert audio
to a format suitable for A/B mixing (5.1 PCM + 2.0 PCM). The audio A/B mixer then transitions
(fades or cuts) between sources, a voice-over can be mixed, and the output is encoded back into
the required Dolby E configuration (5.1 Dolby E + 2.0 PCM).
Fig. 3-6: Agile Audio Handling - 2 Dolby Decodes and an Encode
Station
Router
Dolby E
Decode
English 5.1 PCM
Spanish 2.0 PCM A
B English 5.1 Dolby E
Spanish 2.0 PCM
English 5.1 Dolby E
Spanish 2.0 PCM
Dolby E
Decode
A/B
Mix
VOs
Dolby E
Encode