Adobe AUDITION 1.5 - Manual (Page 245)

237 ADOBE AUDITION 1.5
User Guide
• Block Size offers three size options, each with a different compression ratio and quality
level: Large (Default Quality), with a compression ratio of 3.98:1; Medium (Good
Quality), with a compression ratio of 3.81:1; and Small (High Quality), with a
compression ratio of 3.25:1.
mp3PRO® (.mp3)
The mp3PRO filter enables Adobe Audition to directly encode and decode .mp3 files.
When you save a file to mp3 format, the audio is encoded and compressed according to
the options you select. When you open an .mp3 file, the audio converts into the uncom-
pressed internal format of Adobe Audition. As a result, you can save an .mp3 file in any
format.
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.
MP3/mp3PRO ® Encoder Options dialog box contains two sets of options: basic options
for choosing an encoding method and more advanced options. To view the advanced
options, click Advanced. To view only the basic options, click Simple.
Basic options Choose from the following:
• CBR (constant bit rate) encodes the same bit rate throughout the entire file. This
method is the most common and the most predictable for bandwidth and file size.
• VBR (variable bit rate) encodes higher bit rates for more complex material and lower
bit rates for simpler material. While it depends on the source material, VBR-encoded
.mp3 files generally tend to be smaller than CBR-encoded .mp3 files. Use the menu
below the VBR option to choose a quality level from 10 (lowest quality but smaller file)
to 100 (highest quality but larger file). Some mp3 players don’t support VBR-encoded
files. For maximum compatibility, select CBR.
• MP3 encodes the file to mp3, but without the PRO data.
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