User Manual

Sample Rate Conversion and Audio Import
293
Sample Rate Conversion and Audio Import
When you import audio to your project, you have the option of converting the sample rate of the
source audio files to the project sample rate. You select this option on the Audio tab of the Import
settings dialog box (see “Import Settings: Audio Tab” on page 1418). The default setting is to
convert all files, which means that your Avid editing application converts the sample rate of
source files to the project sample rate when it imports the file to your project. If you deselect this
option, your Avid editing application imports the files at the source sample rate.
If you choose to convert your source sample rates when importing audio files, you also have the
option to skip the conversion of files recorded with pullup or pulldown sample rates. This option
affects the import process in the following ways:
• Skipping the sample rate conversion of audio files with .1% pullup or pulldown sample rates
imports the files, bit for bit, with no change to the source audio file. Your Avid editing
application marks the imported files with non-pullup or non-pulldown sample rates, and the
length and pitch of the imported audio changes by plus or minus .1%. For example, a source
audio file with a 48048 sample rate is marked on import with a 48000 sample rate, and it
plays back .1% slower than audio with a converted sample rate. Because no conversion
occurs, importing the files proceeds quickly. This is the default setting.
• Converting audio files with pullup or pulldown sample rates results in imported files with the
project sample rate. The length and pitch of the imported audio matches the length and pitch
of the source audio. Because your Avid editing application must convert the sample rates,
importing these files proceeds less quickly than it does when skipping the sample rate
conversion.
If you choose not to convert any sample rates when you import audio files, your Avid editing
application imports the audio files at the source sample rate. This leaves the audio source files
unchanged, but your Avid editing application marks any source files with pullup or pulldown
sample rates with non-pullup or non-pulldown sample rates, and the length and pitch of the
imported audio changes by plus or minus .1%. Again, this means that a source audio file with a
48048 sample rate is marked on import with a 48000 sample rate, and it plays back .1% slower
than audio with a converted sample rate.
For information on setting the import options for converting audio sample rates, see “Adjusting
Gain Before Importing Audio Files” on page 292.