Operation Manual

ADOBE AUDITION 3.0
User Guide
244
Close files
❖ Do any of the following:
• To close the current audio file in Edit View, choose File > Close.
• To close the current session file in Multitrack View but leave related media files open, choose File > Close Session.
• To close a CD list in CD View, choose File > Close CD List.
• To close all audio and video files not in use, choose File > Close Unused Media.
• To close all open audio, video, session, and CD list files, choose File > Close All.
Audio file formats
About audio file formats
Adobe Audition lets you open and save files in a wide variety of audio formats. In most cases, you should save
uncompressed audio in Windows PCM format and compressed audio in either mp3PRO or Windows Media Audio
format. Use other formats only in special situations.
Some formats provide options for saving audio data. Click Options in the Save As dialog box to access them.
Note: If you want to save files in a format that’s not listed here, you may be able to do so by using an ACM Waveform
codec. For more information, see “ACM Waveform (.wav)” on page 245.
64-bit doubles (RAW) (.dbl)
This format uses 8-byte doubles in binary form—8 bytes per sample mono, or 16 bytes per sample stereo interleaved.
The 64-bit doubles format has no header—it’s purely audio data, just like the raw PCM format.
8-bit signed (.sam)
This format is popular for building MOD files, since audio in MOD files is 8-bit signed. Many MOD editors allow
samples to be inserted from or exported to files in this format. Files with the .sam extension contain 8-bit signed raw
data, and by default, they have no headers. The sample rate starts off as 22050 Hz, but you can change the sample
rate after you open the file by choosing Edit > Adjust Sample Rate.
A/mu-Law Wave (.wav)
The A-Law and mu-Law WAV formats (CCITT standard G.711) are common in telephony applications. These
encoding formats compress the original 16-bit audio to 8-bit audio (for a 2:1 compression ratio) with a dynamic
range of about 13-bits (78 dB). While A-Law and mu-Law encoded waveforms have a higher signal-to-noise ratio
than 8-bit PCM, they also have a bit more distortion than the original 16-bit audio. Still, the quality is higher than
you would get with some 4-bit ADPCM formats.
Note: Files saved in this format expand automatically to 16-bits when opened, so you shouldn’t save 8-bit files in this
format.
Choose from the following options:
A-Law 8-bit A slight variation of the standard mu-Law format and is found in European systems.
mu-Law 8-bit The international standard telecommunications encoding format and is the default option.