User`s guide

Pro Tools Reference Guide340
SMPTE Resolved with USD
(TDM Systems Only)
You can use the optional USD, or an equiv-
alent third-party device, to resolve
Pro Tools recording/playback speed with
any of the following clock reference
sources while slaving Pro Tools to LTC:
• Video source
• Video “blackburst” or “house” sync
• VITC
• 1x Word Clock
• AES/EBU “null” clock
• 256x slave clock
• Pilot Tone
• Bi-Phase
This enables long-term, high-fidelity syn-
chronization when all transports within
the system are resolved to this common
sync source, or by resolving to any varia-
tions in incoming time code while slaving
to LTC.
Other USD and SSD Sync
Options
By adding a USD or SSD to your Pro Tools
TDM system, you can use Pro Tools as the
master device in your synchronization
setup. All other devices are then slaved to
Pro Tools.
You can use Pro Tools in conjunction with
either the USD or SSD to generate SMPTE
LTC, MIDI Time Code, Slave Clock, or
MMC messages. When either the SSD or
USD is reading incoming SMPTE time code
from the SMPTE In connector, it regener-
ates the time code through the SMPTE Out
connector. This signal can be passed along
to other slave devices.
☞ For instructions on connecting an external
sync peripheral to your Pro Tools system, refer
to the instructions in the
Pro Tools Hardware
Installation Guide.
The Session Setup Window
The Session Setup window allows you to
configure various time code-related param-
eters on your system. The following set-
tings can be adjusted in this window:
Sample Rate
This allows you to set the sample rate for
the current session. Choices are 48,000 Hz
(48 kHz) or 44,100 Hz (44.1 kHz).
44,100 Hz is the sample rate used on audio
compact discs.
Bit Depth
This display-only area indicates the bit
depth for the current session.
Mixer
This area indicates the type of the Pro Tools
mixer in use. On TDM systems, the mixer
field will display the current mixer in use:
Session Setup Window