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Adobe Handleiding Adobe Audition 3.0 Manual

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ADOBE AUDITION 3.0
User Guide
258
Normalizing groups of files
Normalize a group of files
When you normalize a waveform, the loudest part of the waveform is set to a specified amplitude, thereby raising or
lowering all other parts of the same waveform by the same amount. Group Waveform Normalize lets you normalize
the volume of multiple open waveforms by using a three-stage batch process. If volume is raised during this process,
Adobe Audition can apply limiting to prevent clipping.
If you’re getting ready to master an audio CD, using Group Waveform Normalize is a great way to make sure that
all tracks on the CD have a consistent volume.
1 In Edit View or CD View, import the waveforms you want to normalize.
2 Choose Edit > Group Waveform Normalize.
3 Select the waveforms you want to normalize. Click to select a single file, Shift-click to select contiguous files, Ctrl-
click to select noncontiguous files, and drag to select a group of files.
4 Click the Analyze Loudness tab, and then click Analyze Statistical Information to display amplitude statistics for
each waveform. Double-click a file in this list to see more detailed statistics, including an RMS histogram and a
clipping profile. (See “Analyze Loudness statistics” on page 258.)
5 Click the Normalize tab, and specify how you want to normalize the waveforms. (See “Group Waveform
Normalize options” on page 259.)
6 Click Run Normalize.
See also
“Normalize effect (Edit View only)” on page 120
Analyze Loudness statistics
In the Group Waveform Normalize dialog box, click the Analyze Loudness tab, and then click Analyze Statistical
Information to display the following data:
Eq-Loud Is the average loudness value with an equal-loudness equalization curve that takes into account frequencies
to which the human ear is most sensitive.
Loud Is the average loudness value without equal-loudness equalization.
Max Is the maximum RMS (Root-Mean-Square) amplitude present.
Avg Is the average RMS amplitude of the entire waveform. This value isn’t used for normalization.
% Clip Is the percentage of the waveform that would be clipped as a result of normalization. Clipping won’t occur if
limiting (in which loud passages are decreased in volume) is used; instead, the louder portions of audio are limited
to prevent clipping. In general, avoid values higher than 5% to prevent audible artifacts from occurring in the louder
portions of audio.
Reset Clears all of the normalization statistics for the files in the list.
Double-click a file in this list to see more detailed statistics, including a complete RMS histogram, which shows the
relative amounts of audio at each loudness level, and a clipping profile, which shows how much clipping will occur
for each decibel of amplification.
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