Calrec Apollo, Operator'S Manual

Page: 205 / 214

CALREC
Putting Sound in the Picture
205
Core
Processing rack for a mixing console or
standalone router.
DAC (Digital to Analogue
Conversion)
The reverse of ADC. The digital
representation of a signal is converted
back into a continuous analogue signal.
Desk Output
Type of Main bus output which does
not receive the output tone or talkback
switching that affects Main Line outputs.
Direct Output
Output from a channel or group path with
level control and pre EQ / pre fader /
post fader selection. By default a direct
output contains only the audio present on
the path, but can be switched to output
mix-minus - everything routed to the
mix-minus bus apart from the path’s own
audio.
Downmix
The process of converting a signal of a
given width into a signal of a smaller width
allowing fixed or variable amounts of each
of the contributing legs to be included.
For example, a downmix must be applied
to a 5.1 surround signal for it to be
correctly translated into a stereo format.
Without a downmix, surround, LFE or
centre information may be lost and levels
may become unbalanced.
DSP
Digital Signal Processing. Discrete
mathematical operations applied to a
stream of digital audio signals.
DSP Module
A module fitted in the Apollo rack which
performs all the DSP functions of the
system.
Expansion Router
Apollo and Artemis Shine & Beam (not
Artemis light) processing racks have an
expansion card slot that can be fitted with
an additional router card as an option to
double the quantity of I/O ports available
within the rack.
Fader
Fader refers to one of the physical faders
available on the surface (see Channel
Faders, Main Faders and Spill Faders).
Fader Bargraph Meters
LED meters next to each fader on the
surface provide input metering.
Fader Panel
A panel containing a touchscreen TFT
and multiple Cells and displays. The
function of this panel can be altered
during operation of the surface.
Fader Touchscreen
The TFT touchscreen display located in
a fader panel. Provides flexible options
for displaying and controlling information
directly through touch.
Foldback
An audio mix sent to a presenter or artist.
Applications include enabling them to
hear their own input or communications.
Gigabit Ethernet
A family of network technologies used
for connecting equipment and efficiently
passing large amounts information over
copper or fibre links.
GPI/O (General Purpose Inputs/
Outputs)
These connections allow simple on/off
signals to be sent and received by the
system. Functions of the system can
be controlled from external sources via
opto-isolated inputs. The system can
control external items of equipment based
upon surface actions via relay outputs.
GPI/O connections are optional fittings on
Hydra2 I/O boxes
Group Bus
A bus to which many audio signals
can be routed, summed and controlled
simultaneously with a single fader. For
example all audience microphones may
be sent to the same group bus for easy
access. Buses can be patched to physical
outputs and have full EQ and dynamics
processing. For a non-summing group
see VCA Groups.
Host Console
A Host console is one which is configured
to act as a remote controller for RP1 units.
Hydra2
An audio networking system which links
I/O boxes to one or many consoles over
Gigabit Ethernet. Apollo is based around
a Hydra2 system.
Hydra2 Router Module
All Hydra2 I/O boxes connect to the
network via a router. The router module
contains 16 SFP sockets that can
accept either copper or a range of fibre
connections by using the appropriate
adaptor.
Interrogation
Interrogating a bus reveals all contributing
paths. For example an Aux bus could be
interrogated in order to find all the paths
which have been routed to it. Routing
can also be performed in reverse where a
number of paths can be selected and be
routed to the currently interrogated bus.
(See Reverse Routing).
Interruptible Foldback (IFB)
IFB is a foldback mix which can be
interrupted by tone or talkback. This
function is normally handled by the track
buses.