Avid HD OMNI Preamp, I/O, and Monitoring Pro Tools HD Series Interface - Manual (Page 31)

Chapter 4: Configuring HD OMNI in Pro Tools 27
Digital 1–2 Input Format Selects the digital input
format for channels 1 and 2:
• AES/EBU
• S/PDIF
• Optical (S/PDIF)—resets the Optical I/O
port (which is, by default, eight channels of
ADAT I/O) to two channels of
S/PDIF Optical I/O
Optical Output Format Selects the digital output
format for the Optical output:
• ADAT—Provides eight channels of ADAT
optical output at 44.1 and 48 kHz.
• ADAT S/MUX—Provides eight channels of
ADAT S/MUX optical output at 88.2 and
96 kHz, and four channels of ADAT S/MUX
optical output at 176.4 and 192 kHz.
• Optical (S/PDIF)—Provides two channels of
S/PDIF optical output at sample rates up to
96 kHz.
Sample Rate Conversion Enables (or disables)
real-time sample rate conversion for the selected
Digital 1–2 Input Format. When enabled, if the
sample rate of the digital input source differs
from the Pro Tools session sample rate,
HD OMNI converts the incoming sample rate to
the session sample rate in real time.
S/PDIF Output Format For S/PDIF compatibility
with Tascam DA-30 DAT recorders, select the
Tascam option under S/PDIF Output Format.
Ext. Clock Output Selects the appropriate output
from the Ext. Clock Output pop-up menu to send
clock output to other devices attached to HD
OMNI. The available
Ext. Clock Output options
vary depending on the sample rate.
If the session sample rate is higher than
96 kHz and
Digital 1–2 Input Format is set
to Optical (S/PDIF) , the Sample Rate Conver-
sion option is automatically enabled (since
Optical S/PDIF only supports sample rates
up to 96 kHz).
Sample rate conversion increases latency by a
variable amount depending on the difference
between sample rates.