Calrec Artemis Operator'S Manual Download

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PassingencodedDolbyE

If required, Dolby E encoded signals can
be routed through the Hydra2 domain
without decoding. When patching input
ports containing Dolby E encoded signals
directly to output ports, it is important to
ensure that any sample rate converters on
the incoming signal are switched OFF.

An Encoded signal may be input as an
AES pair or embedded into SDI or MADI
streams and can be patched directly to
AES, MADI or SDI outputs irrespective of
the format the input is in. Calrec inputs
such as AES and AES within SDI do
have sample rate converters and will be
switched in as a default. To maintain the
integrity of the encoded signal, ensure
the SRC of the port it is being fed into is
switched off.

Patching the input ports to a decoder
(as well as directly to the required output
ports) will automatically switch the SRC
off. If required, the patch to the decoder
can then be removed, the SRC will stay
off.

Alternatively, or if no decoders are fitted,
the SRC can be switched manually by
patching the input port to a channel input
(as well as directly to the required output
ports).

SRC can be switched on and off from the
TFT screen of any of the PROCESSING
modes, when the channel is the currently
assigned path.

The ports can then be removed from the
input channel and the port’s SRC on/off
status is retained.

Note: DolbyE will not function at
sample rates other than base rate
i.e. it won’t work at 96kHz.

Click on the ‘

Select Destination’

button

above the destinations table, choose
‘

Output Ports’

from the pop-up menu

and then select the port list containing the
decoders.

Two ports are available for each decoder
card for the L & R of an encoded pair.
Highlight one of the encoders in the list
and patch the L& R input port pair to
the L & R of the chosen encoder. The
audio from the chosen input ports is now
feeding the chosen encoder card.

Then, from the ‘

Select Source’

menu find

the list containing the decoder’s output.
8 ports provide inputs to the system from
the output of each decoder card. These
ports can be patched in the same way as
regular I/O ports.

To put them on input channel paths,
choose ‘My Desk Inputs’ from the ‘Select
Destination’ menu, or to pass the decoded
audio straight out they can also be
patched directly to output ports of any
format. See Fig 2 on the previous page.
Like other input ports, the feed from the
decoders can be patched to multiple
destinations simultaneously.

Important-samplerateconversion

In order for a Dolby E signal to be
decoded, it must NOT be sample rate
converted before reaching the decoder.
Patching an AES input source, either from
a regular AES port or from within an SDI
stream to a decoder will automatically
turn the sample rate convertor (SRC) off
for that specific AES pair at the Hydra2
input stage.

For successful decoding, ensure that the
signal is not being sample rate converted
before it reaches the Hydra2 input, for
example by external routers or de-
embedders.

The switching of SRC on an input port
will affect all instances where that port is
being used, including other consoles on
the network that may be accessing it. To
turn a Calrec SRC back on, or to manually
switch on / off, the input itself (as oppose
to the decoder) it should be patched to an
input channel.

With the input channel selected as the
currently assigned path, SRC switching
buttons are available from the TFT screen
of any of the PROCESSING modes. The
on / off status of a port’s SRC is retained
after removing it from an input channel.

Once the signal has passed through the
decoder it is then automatically sample
rate converted to ensure the integrity of
the signal through the console. SRC of
the decoded signal cannot be turned off.

Important-synchronisation

If an SDI stream is connected to the
VO5873, its decoder cards will operate
using the SDI stream’s frame sync. This is
to allow extracted metadata to be aligned
relative to the video frame sync.

If the card is being fed SDI whilst
decoding a signal that is not part of
that SDI stream, it is important that
the encoded signal has the same sync
reference as the SDI stream feeding the
card.

Failure to ensure this will result in loss of
audio and metadata.

Metadata

A connector on the VO5873 front panel
outputs metadata extracted by the Dolby
E decoder cards.

Please refer to the Hydra2 Installation
Manual for the connector pin-out
information.