Grass Valley DHP v.1.1 - Manual (Page 42)

34
DHP Service
Notes
The video signal can come from any standard input or disembedder input. It is the operator who
designates the source of the video. The video is routed through an embedder port to the stan-
dard output chosen by the operator.
D-L, Case 20
Mixed to (Embedder + MADI)
In the case of mixed input (standard, disembedder, or MADI), audio is extracted from the various
inputs according to the breakaway specified by the operator. If there are standard inputs among
the mix, a disembedder in the DHP core is required to extract the audio from each one.
The audio from the various sources is routed through the TDM matrix to the ports designated by
the operator. Some of the audio can be directed to MADI output and some to the embedder
output, depending on the level set of the destination.
(Because the embedder card supports 16 audio channels, this scenario could potentially have
up to 16 input sources of various kinds.)
The video signal can come from any standard input or disembedder input. It is the operator who
designates the source of the video. The video is directed to the embedder port chosen by the
operator. That port is not part of the DHP core.
Notes
Embedders and Disembedders
The DHP service keeps an internal list of which devices are already being disembedded so that it
does not use up more than one disembedder for that device. It will not free the disembedder
until none of its channels are being routed to destinations.
To clear a disembedder forcibly, an operator must route a new source to the disembedder’s
current destination(s). This action is tricky because there might be several destinations for each
channel. (Clearing a disembedder might be hard for an operator to accomplish because it is not
always obvious to what current destinations a disembedder is routed and the operator might
not be able to tell where a particular disembedder source is routed). As long as one audio
channel remains routed
5
to a destination, the disembedder will not be free to use.
The web suite does not have commands that clear the disembedders and embedders used by
the DHP core.
MADI Out
In
Std In
Std Out
MADI In
DIS
EMB
DIS
Out
5. The channel is still listed in the disembedder data structures as having a destination