APU Software APU Dynamics Optimizer 2.8.4

一款支持现代音量度量（LUFS、True Peak）的动态优化器。

APU Dynamics Optimizer采用和APU Loudness Compressor相同的压缩引擎，根据完整的音频波形进行测量，而不是实时信号分析测量，因此用户可以在整个波形上精心优化增益包络。

APU Dynamics Optimizer可以非常精确地针对特定的平均LUFS和动态范围进行目标设定，优化增益包络后，用户可以使用压缩器插件相同的参数集实时播放结果，并调整声音的特性。

当首次打开音频文件时，APU Dynamics Optimizer将分析音频文件的音量时间轴，然后得到一对直方图。左边是音频文件的当前音量分布，右边是目标分布。优化器的任务是通过整个音频文件动态地压缩和扩展音频，以匹配目标分布。

接下来用户可以调整信号源百分位数，在优化过程中排除不需要的音频信息。默认情况下，百分位数设置为与LUFS的LRA标准相匹配，更好地捕捉音频的主体部分。

用户完成优化后，可使用压缩器插件相同的参数集实时播放结果，并调整声音的特性。在进行任何调整时，可以使用播放/停止按钮和查找滑块来浏览音频，满意之后可以将优化后的音频导出为新文件。

APU Dynamics Optimizer的导出文件始终采用与原始音频相同的采样率，采用32位浮点波形格式，确保音频的最高音质。该格式还支持超过0dBFS，确保不会发生削波，用户还可以在监听和导出时选择是否使用内置的限制器。

Win/macOS | File size: 22.2 MB

The APU Dynamics Optimizer is a dynamics optimization tool designed to support modern loudness types (LUFS, True Peak). Underneath the hood, the optimizer uses the same compression engine as the APU Loudness Compressor, but benefits from the full audio waveform instead of real-time measurements. This allows the gain envelope to be meticulously optimized across the entire waveform.

The design of this tool allows you to very precisely target a specific average LUFS and dynamic range. Once the gain envelope has been optimized, you can playback the result in real-time while adjusting the character of the sound with the same collection of parameters from the compressor plug-in.

Walkthrough
When you first open an audio file, the optimizer will analyze the audio file’s loudness timeline. You’ll then be presented with a pair of histograms. On the left, you’ll see the audio file’s current loudness distribution. On the right, you’ll see a target distribution. The optimizer’s job is to dynamically compress and expand the audio throughout the entire audio file strategically to match the target distribution.

Before continuing to the next step, you can make adjustments to the source percentiles. This allows you to exclude any unwanted audio from the optimization process. By default, the percentiles are set to match the LRA standard from LUFS. This generally does a good job capturing the main body of the audio.

Once you’re happy with the source percentile range, you can then press the right arrow to continue to the next step.

Once optimization is complete, you can play the result in real-time while adjusting the character of the sound with the same collection of parameters from the compressor plug-in. Use the play/stop buttons and seek slider to navigate the audio while making any adjustments you’d like.

Once you’re happy with the result, you can export the optimized audio to a new file. This file is always stored with the same samplerate as the original audio, using 32-bit floating point wave format. This ensures the highest quality audio is preserved. This format also allows samples over 0 dBFS, which ensures no clipping occurs.

You can listen and export with or without limiting. The built-in limiter can be configured in the Limiter tab, or you can bypass the limiter entirely and use your own external limiter after export.

Dynamics shaping
The dynamics optimizer allows you to reshape the full dynamics spectrum of your audio file. You can choose between Uniform or Normal distribution, with the ability to skew the latter toward the top or bottom of the distribution. This allows you to shape the dynamics of your audio in a variety of ways. The optimizer takes this information and uses it to make many tiny adjustments to the compress/expand ratio over time. Something you’d never be able to do with a traditional compressor.

The optimizer can be configured to use the following distribution types

Uniform
Uniform distribution type is a flat distribution across the entire loudness range. This is a good starting point for most audio files, as it doesn’t favor any particular loudness range. The result is an extremely balance loudness profile.

Normal
Normal distribution type is a bell curve distribution which can be skewed toward the top or bottom of the distribution. This allows you to dial in a very particular shape of your choosing, whether it’s to more closely match the original audio or for creative effect.

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