APU Software APU Loudness Limiter v3.2.1 MacOS

APU Loudness Limiter支持多种响度类型，检测电路可以配置为LUFS或传统的RMS、峰值测量单位，用户还可以选择分离或链接通道，处理类似Dolby Atmos这样的多通道音频格式。APU Loudness Limiter内部限制器的弹性会根据不同的响度类型进行调整，适应各种限制设置。

APU Loudness Limiter的检测电路可以配置为多种响度类型，包括有Momentary瞬时响度、Short-Term短期响度、Integrated整体响度、RMS、True Peak真实峰值和Peak峰值。

瞬时响度是400ms的短时间LUFS测量方式，适用于处理音频的瞬态，该模式响应快速且透明，K加权和通道加权应用于压缩器的检测电路，提升感知精度。短期响度是3s的较长时间LUFS测量方式，适用于处理音频大尺度的动态，由于测量时间更长，该模式的响应性不如瞬时响度，但适用于调整音频整体动态。整体响度则是无限时长的LUFS测量方式，K加权和通道加权与瞬时模式一致，并应用了相对和绝对门限，这种响度类型适用于将音频的整体响度持续调整到特定目标响度。

RMS响度类型是一种传统的响度测量方式，是感知响度的一级近似值，采用默认的150毫秒滚动时间间隔，用户可自行调整，此模式不对限幅器的检测电路应用K加权或通道加权，呈现出更为传统的特性。

真实峰值响度类型与传统峰值测量相似，但因采样间峰值而更精确，此测量方式使用等于配置块大小的时间间隔，可以防止采样间峰值削波，非常适合母带制作。峰值响度类型是标准峰值电路，运行时间间隔等于配置块大小，从技术上看，该模式比真实峰值更具响应性，但未考虑采样间峰值，精确度较低。

APU Loudness Limiter插件格式为VST、AU和AAX

Team R2R | 05 Oct 2024 | 72.5MB

The APU Loudness Limiter is a real-time limiter designed to support multiple loudness types simultaneously. The limiter can be configured to use LUFS, True Peak, RMS, and/or Peak loudness types. This allows you to target multiple requirements simultaneously, such as a specific LUFS target and a specific True Peak target. Internally, the ballistics of the limiter are adjusted to accommodate the different loudness type limiter settings.

Loudness flavors
One of the key features of this limiter is its support for a variety of loudness types. The limiter’s detection circuitry can be configured to use either LUFS and/or traditional measurement units (RMS, Peak). You can also choose to split or link channels, which is particularly useful for multi-channel audio formats such as Dolby Atmos®.

The limiter’s detection circuitry can be configured to use any of the following loudness types

Momentary
Momentary is a short duration LUFS measurement (400ms), which is useful for processing the audio’s moment-by-moment dynamics. This mode is responsive but also transparent. K-weighting and channel weighting are applied to the compressor’s detection circuitry, improving perceptual accuracy.

Short-Term
Short-Term is a longer duration LUFS measurement (3 seconds), which is useful for processing the audio’s large scale dynamics. Given the longer duration, this mode is less responsive than momentary, but it can be useful for adjusting the bigger picture of the audio’s dynamics. K-weighting and channel weighting are applied as with momentary.

Integrated
Integrated is an infinite duration LUFS measurement. K-weighting and channel weighting are applied as with momentary, as well as both relative and absolute gating. This loudness type can be useful for continuously wrangling the audio’s integrated loudness toward a specific target.

RMS
RMS loudness types use a rolling time interval of 150ms by default, which can be adjusted. RMS is a traditional loudness measurement, which is a good first-order approximation of perceived loudness. This mode doesn’t apply K-weighting or channel weighting to the limiter’s detection circuitry, giving it a more traditional character.

True Peak
True Peak loudness types are similar to traditional peak measurements, but they are more accurate as they take into consideration inter-sample peaks. These measurements use a time interval equal to the configured block size (1ms by default). This mode prevents clipping inter-sample peaks, which can be useful for mastering.

Peak
Peak loudness types are a standard peak circuit, operating on a time interval equal to the configured block size (1ms by default). This is another traditional limiter style measurement. Technically, this mode is even slightly more responsive than True Peak, but it is less accurate as it doesn’t take into consideration inter-sample peaks.

System Requirements
macOS 10.14 (x86, x64, ARM)

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