Installation guide

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” in the Help). 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 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. The 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 the 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, the editing

application imports the audio files at the source sample rate. This leaves the audio source

files unchanged, but the 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.