Albalá Ingenieros DDF2008C01, Manual

Page: 16 / 34

Albalá Ingenieros | Manual DDF2008C01
them.
4.2. Functional description
The DDF2008C01 is an auxiliary TL2000 line terminal module that includes eight digital
audio interfaces through which AES/EBU streams can be received for delivery to modules
located in adjacent slots or the AES/EBU streams from adjacent modules can be
transmitted.
The backplane of the UR2000 mounting frame provides lines that interconnect between
adjacent modules. Of these lines, the four that are used to pass audio between the
modules are referred to as the (Daisy Chain Audio Bus), or AUDIOCHAIN.
The module located in the slot farthest to the left of the mounting frame functions as
the master of the AUDIOCHAIN and generates the clock for audio signals that the other
modules connected to this bus synchronize to.
Using the AUDIOCHAIN, 16 channels of audio can be transmitted in one direction while
16 more channels of audio can be transmitted simultaneously in the other direction.
Each module connected to the AUDIOCHAIN can pass the audio channels being
transmitted in either direction or can replace them with the audio channels present at
that module inputs, if there are any. This can be configured channel-by-channel.
The 16 audio channels being transmitted in each direction are labeled R2L (Right to Left)
and L2R (Left to Right).
When the task at hand is to embed or de-embed audio into or from a video signal the
equipment acting as the master for the AUDIOCHAIN is an SDI video processor and the
audio front-ends (DAF2008C01, ADF2008C01, DDF2008C01 or DEF2008C01) operate as
slaves. However it is also possible to use a DAF2008C01, ADF2008C01, DDF2008C01 or
DEF2008C01 audio front-end modules as bus masters in order to convert analog audio
to AES/EBU digital format or vice-versa, or to create small audio switching matrices with
a reduced footprint.
Various types of audio front ends can be installed in adjacent slots in order to perform
complex tasks such as simultaneous embedding and de-embedding of analog and
digital signals into/from the same video signal.
In addition to the switching matrix that allows assignment of audio signals between the
AUDIOCHAIN and the AES/EBU input and output interfaces, the DDF2008C01 includes
signal level adjustment and signal level indicators for the AES/EBU interfaces.
The following figure shows a simplified diagram of the functionality of the DDF2008C01.
L2R IN, L2R OUT, R2L IN and R2L OUT are the lines from AUDIOCHAIN that carry the 16
channels of multiplexed audio. AES/EBU AUDIO IN/OUT are the eight AES/EBU input and
output interfaces of the module.
16