Grass Valley Maestro Master Control Installation v.2.4.0 - Manual (Page 54)

54 MAESTRO Installation and Service Manual
Section 2 — Installation Planning
A maximum of one SD or HD Processor board can be installed in a 4 RU
frame. Due to headroom limitations, a Maestro board cannot be installed in
the top slot of the 4RU Concerto frame.
Note If you are planning on installing the Maestro Branding Engine in the bottom
slot of either the 4RU or 7RU Concerto chassis, please contact Customer
support before proceeding with the installation process.
.
Audio Channels and Groups
Audio operation with the Maestro Processor is based upon an "audio
group" concept. An audio group is defined as a set of related audio chan-
nels that can be presented to a listener simultaneously. For example, a left
and a right audio channel together form a pair that is considered a group,
with the type of “stereo.” When sent to a pair of speakers a stereo audio
image is presented to the listener. Either audio channel alone is incomplete.
(However, two audio channels of two different languages even though pre-
sented with one in the left speaker and the other in the right speaker do not
represent an audio group because the signals are not related and in fact
would cause nothing but confusion for the listener.) Another example of an
audio group would be a set of six audio channels arranged as a Dolby 5.1
surround set of signals.
The Maestro Processor is designed to handle each group of audio channels
as a single object that is switched, mixed, faded, and remapped as a group.
This concept greatly reduces the complexity of multi-audio channel broad-
casting. All of the configuration and operational features of the Maestro
switcher use this audio group concept.
Each Processor can be configured with from 1 to 16 audio channels in from
1 to 16 audio groups. A mixture of mono, stereo, Dolby 5.1 surround and
Dolby E audio group types arranged in any order is possible with a few
restrictions based upon pairs of audio channels.
Dolby E metadata switching is also supported via the rear panel RS-422
Metadata connector.
MADI Audio Expansion
MADI audio can be input to Maestro, using the BNC connector, in one of
two ways:
• From a Grass Valley Apex audio router. This will limit the number of
cables between the audio router and Maestro to a maximum of three.
Note Contact Grass Valley Technical Support for assistance in determining if your
Apex router is capable of AES-to-MADI conversion.
• From a Sonata AES-to-MADI converter.