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Chapter 5: Pro Tools Systems 47
Synchronization
• Loop Sync input and output for connecting
additional Pro Tools|HD interfaces and pe-
ripherals
• External Clock input and output for synchro-
nizing HD OMNI with external Word Clock
devices
HD I/O Audio Interface
HD I/O is a multichannel digital audio interface
designed for use with Pro Tools|HD systems.
HD I/O features extremely high quality 24-bit
analog-to-digital (A/D) and digital-to-analog
(D/A) converters, and supports sample rates of
up to 192 kHz.
HD I/O comes in three standard configurations:
• 8 x 8 x 8 (8 analog in, 8 analog out, and 8
digital in and out)
• 16 x 16 analog in and out
• 16 x 16 digital in and out
You can also add or remove HD I/O Analog Ex-
pansion cards (ADC and DAC) and HD I/O Dig-
ital Expansion cards for custom configurations.
HD I/O Features
HD I/O provides up to 16 discrete channels of
Pro Tools input and output, with 4-segment
LED meters for input and output.
Analog I/O
• Up to sixteen channels of 24-bit D/A and A/D
converters for superior analog input and out-
put at sample rates of 44.1 kHz, 48 kHz,
88.2 kHz, 96 kHz, 176.4 kHz, and 192 kHz
with Analog In and Analog Out HD I/O cards
• Soft Clip and Curv limiting circuits to protect
against clipping on analog input
Digital I/O
• Up to sixteen channels of 24-bit digital I/O,
using AES/EBU, TDIF DB-25, or Optical at
sample rates of 44.1 kHz, 48 kHz, 88.2 kHz, 96
kHz, 176.4 kHz, and 192 kHz with a Digital
HD I/O card
• Real-time sample rate conversion on digital
inputs with a Digital I/O card (up to sixteen
channels of AES/EBU, Optical, or TDIF)
• Support for S/MUX Optical for sample rates of
88.2 kHz and higher
• Support for 2 channels of S/PDIF Optical (en-
closed) with sample rates of up to 96 kHz
• 2 channels of AES/EBU I/O (enclosed) with
support for sample rates up to 192 kHz
• 2 channels of 24-bit-capable S/PDIF I/O (en-
closed) with support for sample rates up to
192 kHz
Synchronization
• Loop Sync input and output for connecting
additional Pro Tools|HD interfaces and pe-
ripherals
• External Clock input and output for synchro-
nizing HD I/O with external Word Clock de-
vices
Expandability
• Optional addition of I/O cards to expand ana-
log or digital I/O
• Simultaneous use of multiple Pro Tools|HD
audio interfaces to further expand system in-
put and output (for more information see the
Expanded Systems Guide)
For more information, see the
HD OMNI Guide.
For more information, see the HD I/O Guide.
