Ensemble Designs 8500 Composite / SD Legalizer and Video Processing Frame Sync User Manual
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8410, 8415, and 8510 Audio Processor Configuration
The 8510 Audio Processor will accept audio from analog or AES input connectors and can
disembed audio from the incoming SDI video stream. The 8410 does everything the 8510
does, except that it has no analog audio I/O. The 8415 Audio Processor accepts audio from
the AES input connectors and can disembed audio from the incoming SDI video stream.
Between the input and output is a 4x4 audio mixer (8x8 mixer with the 8415) with
tracking audio delay. Any incoming audio can be mixed, level controlled and/or shuffled to
another output channel by means of the integrated audio router. The tracking audio delay
allows synchronization and timing to be maintained with time base corrected video
passing through the video frame synchronizer of the 8500.
A built in sample rate converter allows use of asynchronous AES input signals. The Audio
Processors also support encoded audio formats such as AC-3 and Dolby-E. Because these
data streams cannot tolerate sample rate conversion, they must be input to the Audio
Processors synchronous to the video. All audio processing is performed at the full 24 bit
resolution of the system. At the output side of the submodule the four audio channels
(eight channels with the 8415) may be simultaneously routed to analog (8510 only) and
AES output connectors while also being embedded on the outgoing SDI video. An adapter
is also available to allow the AES I/O to be converted from BNC to 110 ohm balanced.
The available audio processing remote control menus are summarized below:
•
Audio In: Status indicators show presence of AES and embedded (SDI) audio
inputs. The In 1/2 Sel and In 3/4 Sel controls provide for selection of inputs to the
audio mixer. The choices for the 8410 and 8510 are AES 1/2, Anlg 1/2, SDI 1/2,
AES 3/4, Anlg 3/4, and SDI 3/4. The 8415 has four additional choices, AES 5/6 and
7/8 and SDI 5/6 and 7/8. Thus any pair of input audio signals can be routed to
either pair of input buses of the output audio mixer. As well (8510 only) the antici-
pated nominal level of this incoming audio can be set with the Anlg Lvl controls.
•
Audio Mode: The Audio Mode control is provided to allow an SDI input with
embedded audio to operate in Audio (normal) or Data (non-audio). The 8500 can
handle both types of content present in AC-3 or Dolby_E signals. Some synchroniz-
ing requirements are necessary for supporting these protocols.
Select the Audio mode when the input audio signal is a standard audio signal
carrying two channels of linear audio. No special timing requirements are needed
in this mode.
Use the Data mode when the serial digital audio is a non-audio, or data, signal.
Some special synchronizing requirements must be observed in this mode as
described in the following examples.
SDI Signal with embedded data – For this case, if an SDI signal with
embedded data is applied to the input, the content will be handled by
passing through the 8500 frame store memory to the output of the 8500.
No audio submodule is required.The audio input signal in this case is syn-
chronous to the timing reference. This is normal operation of the 8500 and
no special configuration is necessary.
Data mode signal to be disembedded and output as an AES stream –
This mode requires the use of an audio submodule to disembed the de-seri-
alized SDI input and route the channels to the correct path. If one of the
channels is normal audio, it can be mixed, swapped, shuffled, and delayed
by the audio submodule. If the other channel is non-audio data, it bypasses
8500-17
Model 8500 Series Modules