Pro Tools | HD I/O Guide22
High Sample Rates and Expanded
Pro Tools|HD Systems
With 176.4 kHz and 192 kHz sample rates, as
many as four Pro Tools|HD cards can be used. Any
additional cards (up to the total system maximum
of seven cards) will switch to Inactive mode. The
Pro Tools|HD cards and any attached peripherals
will become active again when the sample rate is
set to 96 kHz or lower. See the Pro Tools
Expanded Systems Guide for more information.
Clock Source
The Pro Tools Hardware Setup dialog lets you set
the
Clock Source
for the system.
Internal
If you are recording an analog signal
directly into Pro Tools, you will usually use the
Pro Tools
Internal
clock source.
External
If you are transferring material into
Pro Tools from an external digital device, or if you
utilize a common house clock signal, you will need
to synchronize Pro Tools to that digital device or
common signal. Depending on your audio inter-
face configuration and the selected sample rate,
external options can include:
•
S/PDIF [Encl]
(at all sample rates)
•
Optical (S/PDIF) [Encl]
(up to 96 kHz)
•
AES/EBU [Encl]
(at all sample rates)
•
AES/EBU 1–8
(Single Wire in stereo pairs at
all sample rates)
•
AES/EBU 1–4 (Dual Wire)
(in stereo pairs at
176.4 and 192 kHz)
•
ADAT 1–8
(at 44.1 and 48 kHz)
•
ADAT S/MUX 1–4
(at 88.2 and 96 kHz)
•
ADAT S/MUX 1–2
(at 176.4 and 192 kHz)
•
TDIF 1–8
(at 44.1 and 48 kHz)
•
Optical ADAT [Encl]
(at 44.1 and 48 kHz)
•
Word Clock
(at all sample rates)
To select the Clock Source:
1
Choose
Setup > Hardware.
2
From the
Clock Source
pop-up menu, select the
clock source.
3
Click
OK
.
Selecting the Clock Source
Your digital input device must be connected
and powered on for Pro Tools to synchronize
to it. If your input device is not powered on,
leave the Clock Source set to Internal.
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