User`s guide

Chapter 23: Synchronization Concepts 329
chapter 23
Synchronization Concepts
Time code and synchronization (sync) are
complex topics. This section is designed to
give you a basic understanding synchroni-
zation as it relates to your work with
Pro Tools.
However, if you are using a device that
sends or receives time code, such as a video
tape recorder, you need to understand how
that device generates or receives time code,
and how to configure its options. Refer to
the manufacturer’s instructions for opera-
tional details.
Your Sync Requirements
We strongly recommend that you research
what your synchronization requirements
are. For instance, if you’re using Pro Tools
to accomplish audio post-production work
for video, consult with your video engineer
or editor to determine what time code for-
mat is being used. There may be other time
code-related issues that affect how you use
synchronization. Your Digidesign dealer
may also be able to offer suggestions about
using sync with your studio.
Aspects of Sync
Synchronization has two components,
which can be expressed as the following
questions:
◆ “Where are we?” This is called the posi-
tional reference.
◆ “How fast are we going?” This is called
the clock reference.
To sync Pro Tools accurately over an ex-
tended period of time to another device
such as a tape machine or VTR, Pro Tools
needs to know where the device is and at
what speed it’s running. Some peripherals
can provide only one of these references;
for example, a black burst generator or
house sync provides only a clock reference.
Some peripherals, like the Digidesign Uni-
versal Slave Driver (USD), can do both.