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APU Loudness Limiter 是一款实时响度限制器，设计用于同时支持多种响度类型。该限制器可以配置为使用 LUFS、True Peak、RMS 和/或 Peak 响度类型，使你能够同时满足多个响度要求，例如同时设定特定的 LUFS 目标和 True Peak 目标。限制器内部的响应特性会根据所选响度类型自动进行调整，以适配不同的限制模式。

响度类型（Loudness flavors）

这款限制器的核心特点之一是支持多种响度类型。其检测电路可配置为使用 LUFS 和/或传统的测量单位（RMS、Peak）。你还可以选择将声道分开处理或联动处理，这在处理如 Dolby Atmos® 等多声道音频格式时尤其有用。

限制器的检测电路可配置使用以下几种响度类型：

Momentary（瞬时响度）

Momentary 是一种短时长的 LUFS 测量（400 毫秒），适用于处理音频的瞬时动态变化。此模式响应迅速但保持透明度。检测电路中会应用 K 加权和声道加权，以提升听感精度。

Short-Term（短期响度）

Short-Term 是较长时长的 LUFS 测量（3 秒），适用于处理音频的整体动态结构。由于时长更长，响应性不如瞬时模式敏捷，但更适合调整整体动态表现。该模式同样应用了 K 加权和声道加权。

Integrated（整体响度）

Integrated 是无限时长的 LUFS 测量，适用于对音频整体响度进行持续调整以达到特定目标。与瞬时模式相同，该模式应用 K 加权和声道加权，并加入了相对和绝对门限处理。

RMS

RMS 响度类型使用默认 150 毫秒的滚动时间窗口（可调），是一种传统的响度测量方式，是对感知响度的良好一阶近似值。此模式不对检测电路应用 K 加权或声道加权，因此具有更传统的声音特性。

True Peak（真峰值）

True Peak 类似于传统峰值测量，但更精确，因为它考虑了采样之间的峰值（inter-sample peaks）。该测量使用的时间间隔等于配置的块大小（默认 1 毫秒）。此模式可有效防止 inter-sample 峰值削波，非常适合母带处理时使用。

Peak（峰值）

Peak 响度类型是标准的峰值检测电路，也使用等于配置块大小的时间间隔（默认 1 毫秒）。这是另一种传统限制器风格的测量方式。技术上来说，这种模式的响应性甚至略高于 True Peak，但由于不考虑采样间峰值，其准确度较低。

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.

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