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一种基于频谱的限制与削波方法

LimitOne 用户界面

LimitOne

限制器插件

一种基于频谱的限制与削波方法

限制,而不受限

音频限制(Limiting)是一门掌控与管理声音能量的艺术。其目标往往是以最透明的方式,通过调整音量动态来提升响度。传统上,这通常是通过一个能追踪音频信号包络的电子电路实现的,该电路会控制可变增益,以压低峰值、提升较低电平。后来,这些方法被移植到数字领域,并衍生出各种不同的变体与风格。

LimitOne 与众不同。我们的目标并不是要取代其他削波器或限制器——它们都有各自独特的音色,而是希望创造一种全新的方法,用不同的思路来实现以往难以达到的声音结果。

我们的灵感来自双阶段限制器(two-stage limiter)与多段压缩器的设计思路,也来自削波在为声音增添色彩与冲击力方面的特性,同时也注意到了某些处理方式会引入的问题与伪影。于是我们设想:如果不受传统方法的限制,一个真正易用的工具会是什么样?由此诞生了 LimitOne 的核心理念——一种融合频域与时域数字信号处理优势的混合算法。

LimitOne 的独特之处是什么?

独特的混合算法设计

在频率域与时间域中提供自适应的动态控制。LimitOne 由两个主要算法组成,代号分别为 Pufferfish(河豚)Hedgehog(刺猬)

Pufferfish(河豚)

这是一个频域处理器,旨在在设定的 Drive(驱动)与 Ceiling(上限)水平下,优化整个频谱的能量分布。换句话说,它相当于一个全自动、自适应的多段动态控制器。

Hedgehog(刺猬)

这是一个时域处理器,主要用于塑造瞬态(transient)。它采用自适应控制系统,与频域部分共享相同的两个参数:Drive 与 Ceiling。

A spectral approach to limiting and clipping

LimitOne UI

LimitOne

Limiter Plugin

A spectral approach to limiting and clipping

Limiting, but not limited

Audio limiting is the art of managing and controlling sound energy. Often the goal is to increase loudness by changing level dynamics in the most transparent way possible. Historically, this was done by using an electric circuit that follows the envelope of an audio signal and steers a variable gain to reduce peaks and boost low levels. These methods were later emulated in the digital domain and many variations and flavors have been created since.

LimitOne is different. Our goal was not to eliminate all other clippers or limiters out there, as they all add their own color, but to develop a novel approach and do things in a different way, allowing you to get results that weren’t previously possible.

We found inspiration in two-stage limiter methods and multi-band compressor designs, in how clipping adds color and punch, and we also took note of the problems and artifacts that some processing introduces. Then we imagined what an easy-to-use tool would look like if we would not limit ourselves to existing methods. This led to the idea of a hybrid algorithm that combines the advantages of digital signal processing in the frequency domain and time domain.

What’s unique about LimitOne?

Unique hybrid algorithm design

Provides adaptive dynamics control in both frequency and time domain. LimitOne consists of two main algorithms, codenamed Pufferfish and Hedgehog.

Pufferfish

A frequency domain processor that aims to optimize the energy distribution across the whole frequency spectrum for a given Drive and Ceiling level. Another way to describe it: a fully automated adaptive multi-band dynamics controller.

Hedgehog

A time domain processor whose main purpose is to shape transients. It uses an adaptive control system that shares the same two parameters, Drive and Ceiling level.

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