Grass Valley DHP v.1.1 - Manual (Page 32)

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DHP Service
Examples
The service needs all 16 audio sources and a video source to determine whether it should route
anything to a core disembedder or to a re-embedder.
If, during a take, a disembedder or re-embedder is needed and is not available, a status value
will be sent back to the operator’s control panel letting the operator(s) know that they have
either no disembedders available or no re-embedders available.
MADI Output
MADI outputs are independent. Whatever is routed to one MADI output does not affect any
other MADI output, even when the level set of the NV9000 destination includes multiple MADI
outputs. MADI outputs that are unselected during a take remain unaffected.
Examples
There are 20 DHP scenarios, based on 4 kinds of input and 5 kinds of output. Many of the cases
are similar. Some cases are very simple and some are not. In some cases (such as standard input
to standard output) DHP actually does not use the DHP core, but simply passes the take
commands through to the router.
The 20 cases are a cross-product of 4 input situations and 5 outputs, as follows:
 Keep in mind that disembedder cards also emit (internally) the non-disembedded signal as
well as the video and 16 disembedded audio channels. Similarly, embedder cards also
accept video with embedded audio (in a “bypass” mode) and emits that video without
further processing.
 The term MADI applies only to connectors and to external signals. Internally, the individual
MADI signals are AES
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and are switched through a TDM “matrix.”
 Signals processed through AES async cards cannot be part of DHP.
 The DHP core is required when audio shuffling is to be performed. Audio shuffling depends
on the take, usually with breakaway, performed by the operator.
The following cases illustrate the different ways the DHP service handles routes.
Input Port(s) Output Port(s)
A Standard H Standard
B Disembedder I Embedder
C MADI J MADI
D Mixed (standard, disembedder, and MADI) K Standard and MADI
L Embedder and MADI
4. The TDM matrix switches Dolby E, if it is present, as well as AES.