Calrec Apollo, Operator'S Manual

Page: 54 / 214

Getting Signals into Apollo 54 APOLLO
Digital Broadcast Production Console
I/O BOXES & HYDRA PATCHBAYS SAMPLE RATE SELECTION IN H2O
From Version 8
, Apollo consoles
can now work at 96kHz sampling
frequency.
There are 2 elements to 96kHz
operation of Apollo consoles:-
Configuring the DSP and configuring the
I/O to run at different sample rates.
Consoles at 96kHz
The consoles can switch between 48kHz
& 96kHz working as required and they
switch their sampling frequency by loading
a show at the required sample rate built
from a template at that rate.
The numbers of channels and buses are
reduced at 96kHz but the numbers at
48kHz are the same as before.
There is no reduction in the numbers of
monitor inputs and outputs at 96kHz.
I/O and Hydra2 Patchbays at 96kHz
Before the I/O can be used with a 96kHz
console its sample rate has to be changed
to match. In H2O a new button labelled
“Sample Rate” is made available, selecting
this opens the list of I/O boxes connected
to the Hydra2 Network.
The list shown in Fig 1 shows the sample
rate set for each I/O box or Hydra2
Patchbay. In order to change the sample
rate the user first selects the required I/O
box or Hydra2 Patchbay box, this enables
the Set Sample Rate button at the bottom
left of the screen.
Clicking on this opens the Set Sample
Rate popup, allowing the I/O boxes and
Hydra2 Patchbays to be set to 48kHz or
96kHz, or to follow the sample rate of a
specific console. This is shown in Fig 2,
please note that certain older I/O boxes
cannot be set to run at 96kHz such as the
fixed format MADI box.
The Hydra2 network supports 48kHz
and 96kHz consoles and I/O boxes
simultaneously, it achieves this by running
at 48kHz irrespective of whether the
Consoles and I/O boxes are running at
96kHz or not. It simply uses 2 samples
per 96kHz signal.
FIG 1 - I/O BOXES & HYDRA2 PATCHBAYS SAMPLE RATE SCREEN IN H2O
FIG 2 -SET SAMPLE RATE POPUP SCREEN IN H2O