Pro Tools Reference Guide752
Sample Rate
This option lets you save to any of several sam-
ple rates. Choices are dependent on your
Pro Tools system and Digidesign audio inter-
faces.
Sample Rate Conversion Quality
If you choose a sample rate that differs from the
original sample rate of the session, the conver-
sion options become available. You can config-
ure the conversion quality, and schedule con-
version to occur during, or after, the bounce. See
“Sample Rate Conversion Quality Option” on
page 752 for more information.
The following are the more common sample
rates, and their applications. Higher sampling
rates will provide better audio fidelity for record-
ing and playback, and also for processing with
dynamics, dither (with noise shaping), and ana-
log emulation plug-ins.
192000 This is a supported sample rate for some
audio DVDs, and provides the highest quality
audio fidelity with compatible audio interfaces
(such as the 192 I/O).
176400 You may want to work at a sample rate
of 176.4 kHz if the final delivery will be at
44.1 kHz (such as compact disc). This will pro-
vide a slightly faster sample rate conversion to
44.1 kHz than from 192 kHz.
96000 This is a supported sample rate for DVD
audio and provides high-quality audio fidelity
with compatible audio interfaces (such as the
192 I/O, 96 I/O, 96i I/O, and Digi 002).
88200 You may want to work at a sample rate of
88.2 kHz if the final delivery will be at 44.1 kHz
(such as compact disc). This will provide a
slightly faster sample rate conversion to
44.1 kHz than from 96 kHz.
48000 This is a standard sample rate for Profes-
sional and DVD video, as well as some broadcast
and recording label archiving, and is supported
by DA-88/98, DAT, and ADAT decks.
44100 This is the standard sample rate for com-
pact discs (CD), and is supported by DA-88/98,
DAT, and ADAT decks.
Custom For a custom sample rate, click in the
sample rate window and manually enter in a
value.
Pull-Up and Pull-Down Rates All available sample
rates support pull-up and pull-down rates, or
other specialized rates.
Sample Rate Conversion Quality
Option
When you specify a different sample rate for a
bounced file (for example, when mixing a ses-
sion recorded at 96 kHz to 44.1 kHz for release
on an audio CD), Pro Tools uses the Conversion
Quality option to determine the quality of sam-
ple rate conversion used.
There are five possible settings, ranging from
Low (lowest quality) to Tweak Head (highest
quality). The higher the quality of sample rate
conversion, the longer it takes to convert the
bounced file.
Use Squeezer
(8-Bit Resolution Only)
The Use Squeezer option uses a proprietary DSP
algorithm specifically designed for performing
8-bit conversion of simple source files such as
voice-overs. It optimizes the dynamics of the au-
dio by preprocessing it using compression, lim-
iting, and gating before conversion to 8-bit res-
olution. This results in greater apparent
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