Adobe 22011292 User Manual - Page 141
Audio format settings, AIFF format settings (*aif, *.aiff
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USING ADOBE AUDITION 137 Saving and exporting Audio format settings In most cases, you should save uncompressed audio to the AIFF or WAV formats. Save to the compressed mp3 format only when creating files for the web or portable media players. In a Save As or Export dialog box, click Change to the right of Format Settings to access the options below. To see the effect of settings changes, note the Estimated File Size at the bottom of the dialog box. AIFF format settings (*aif, *.aiff, *.aifc) AIFF is the standard uncompressed audio file format on Mac OS. Sample Type (available only for 32-bit files) Sets the audio bit depth. Higher bit depths provide more dynamic range and reduce distortion, though they increase file size and processing time. To determine the proper setting for common output types, see "Understanding bit depth" on page 6. Integer settings clip audio that extends beyond the amplitude range for a given bit depth. Floating Point settings require slightly more storage space, but retain much greater dynamic range. Choose 32-bit Floating Point if you want to repeatedly process the file and discard minimal amplitude data. Note: To add Author metadata to an AIFF file, use the Dublin Core: Creator field on the XMP tab of the Metadata panel. (See "Viewing and editing XMP metadata" on page 138.) Byte Order (available only for 16-bit files) Specifies the numerical sequence for bytes of data. Choose the Little-Endian method for systems with Intel processors and the Big-Endian method for systems with PowerPC processors. mp3 format settings mp3 is the standard compressed audio format across platforms. Type Choose Constant to apply a consistent bitrate or Variable to change the bitrate based on audio content. Bitrate (for constant bitrates) or Quality (for variable) Adjusts the tradeoff between file size and audio quality. Higher settings increase size and quality; lower settings reduce size and quality. Avoid compressing the same audio to mp3 more than once. Opening and resaving an mp3 file causes it to be recompressed, so any artifacts from the compressing process become more pronounced. QuickTime format settings (audio-only *.mov) You cannot adjust format settings for audio-only QuickTime files, which are always saved as uncompressed PCM (Pulse Code Modulation) data. Wave PCM format settings (.wav, .bwf) Wave PCM is the standard uncompressed audio format on Windows. You can include Broadcast Wave metadata in Windows PCM files. (See "Viewing and editing XMP metadata" on page 138.) Sample Type (available only for 32-bit files) Sets the audio bit depth. Higher bit depths provide more dynamic range and reduce distortion, though they increase file size and processing time. To determine the proper setting for common output types, see "Understanding bit depth" on page 6. Integer settings clip audio that extends beyond the amplitude range for a given bit depth. Floating Point settings require slightly more storage space, but retain much greater dynamic range. Last updated 2/16/2012