SSA Plugins aXPlugins Suite a1 2022.09 WiN [MOCHA]包括直接用于Ambisonics信号的效果：延迟、均衡、压缩、噪声门和去噪

流云高飞

SSA插件为音频工程师和艺术家制作空间音频工具。我们专注于Ambisonic插件，旨在使其尽可能容易地发挥创意。



SSA Plugins makes tools for audio engineers and artists working with spatial audio. We specialise in Ambisonic plugins aimed at making it as easy as possible to be creative.

aXPlugins Suite

aXPlugins套件


The aX Ambisonics Suite provide you with the tools for a full signal chain working with spatial and immersive audio – from encoding to decoding and plenty in between.

aX Ambisonics Suite为您提供了一个完整的信号链工具，用于处理空间和沉浸式音频–从编码到解码，以及介于两者之间的大量音频。


The aX Suite includes plugins for Ambisonics panning and monitoring to get you into the world of spatial audio.

aX套件包括Ambisonics平移和监控插件，让您进入空间音频世界。


It also includes effects to use directly on your Ambisonics signals: delay, EQ, compression, noise gate and deesser.

它还包括直接用于Ambisonics信号的效果：延迟、均衡、压缩、噪声门和去噪。



What is Ambisonics?

什么是Ambisonics？


Ambisonics is a spatial audio format that has been around since the 1970s. Since then, its popularity has risen and fallen a few times but is undergoing a resurgence with the emergence of virtual reality (VR). In fact, Ambisonics is now used by some of the biggest video platforms on the internet: YouTube and Facebook!

Ambisonics是一种空间音频格式，自20世纪70年代开始出现。从那时起，它的受欢迎程度曾一度上升或下降，但随着虚拟现实（VR）的出现，它正在复苏。事实上，Ambisonics现在被互联网上一些最大的视频平台使用：YouTube和Facebook！


How does Ambisonics work?

Ambisonics是如何工作的？


Ambisonics works in three steps: encoding, processing and decoding. The encoding stage takes your mono or stereo track and converts (using a plugin such as the aXPanner) it to B-format – a multichannel format where the gain and polarity relationship between the channels is determined by the source position (azimuth and elevation). B-format is independent of the playback stage and can’t be listened to directly. First order Ambisonics (FOA) has 4 channels: W (omnidirectional), X, Y and Z (along the Cartesian axes).

Ambisonics分为三个步骤：编码、处理和解码。编码阶段将您的单声道或立体声音轨转换为B格式（使用插件，如aXPanner），这是一种多声道格式，其中声道之间的增益和极性关系由震源位置（方位角和仰角）决定。B格式独立于回放阶段，不能直接收听。一阶Ambisonics（FOA）有4个通道：W（全向）、X、Y和Z（沿笛卡尔轴）。


The processing step is where you manipulate your sound sources, either individually or as a group. This manipulation can include dynamic range compression, EQ-ing, adding effects such as delay, etc. You can also rotate everything at the same time. Of course, the B-format signals have to be treated carefully to avoid destroying the spatial information. The aX Plugins were designed specifically with this in mind.

处理步骤是单独或分组操作声源。此操作可以包括动态范围压缩、均衡、添加延迟等效果。您还可以同时旋转所有对象。当然，必须小心处理B格式信号，以避免破坏空间信息。aX插件是专门为此而设计的。


The decoding step converts from B-format to loudspeaker or headphone signals. Decoding for headphones (currently the most convenient and common listening method) is via Head Related Transfer Functions (HRTFs). These mimic the acoustic characteristics of the head and ears. This is known as binaural decoding and is available in the aXMonitor series. The aim of this sort of decoder is to create a scene that sounds realistic, not “inside the head” like normal stereo over headphones. Perfect for immersive VR! Decoding to loudspeakers requires you to have quite a lot of loudspeakers in (ideally) a sphere around the listening area and is an amazing (but expensive) sonic experience.

解码步骤将B格式转换为扬声器或耳机信号。耳机解码（目前最方便、最常用的收听方法）是通过头相关传输函数（HRTF）实现的。这些模拟了头部和耳朵的声学特性。这称为双耳解码，在XMonitor系列中可用。这种解码器的目的是创建一个听起来逼真的场景，而不是像耳机上的普通立体声那样“在头内”。非常适合沉浸式VR！解码到扬声器需要在（理想情况下）听力区域周围的一个球体中安装大量扬声器，这是一种令人惊叹（但昂贵）的声音体验。


What Is Higher Order Ambisonics?

什么是高阶环境？


Higher Order Ambisonics (HOA) extends the number of B-format channels thus increasing the spatial resolution of the sound scene. The Ambisonics order can theoretically go to infinity, but in practice DAW plugins are limited to seventh order (64 channels).

高阶环境（HOA）扩展了B格式通道的数量，从而提高了声音场景的空间分辨率。Ambisonics顺序理论上可以达到无限，但实际上DAW插件仅限于七阶（64通道）。

HOA signals of a particular order contain all of the same channels required for any lower-order subset. For example, a third order signal contains the first and second order channels as if you had encoded directly to that order. Just drop the channels at the end corresponding to the higher order components and you’ve down-mixed to lower order. Easy!

特定阶数的HOA信号包含任何低阶子集所需的所有相同信道。例如，一个三阶信号包含一阶和二阶通道，就好像您直接编码到了那个阶一样。只需将对应于高阶分量的通道放在末端，就可以向下混合到低阶分量。容易的

What this means it is always best to mix in the highest order available (and that your CPU can handle) even if it is above the current requirements for the project. Why? Because you will have the lower order signals needed but you will also be able to go back and get the higher spatial-resolution signals if/when the decoding requirements improve. It is the best way to future-proof your Ambisonics work!

这意味着即使高于项目的当前需求，也最好以可用的最高顺序进行混合（并且CPU可以处理）。为什么？因为您将获得所需的低阶信号，但如果/当解码要求提高时，您也可以返回并获得更高的空间分辨率信号。这是未来证明您的Ambisonics工作的最佳方式！


Why use (Higher Order) Ambisonics for VR?

为什么使用（高阶）虚拟现实环境？


(Higher Order) Ambisonics is a scene-based technique which means that it is possibly to apply processing to the whole scene efficiently. For example, your final mix will probably have dozens of sound sources that you want to respond to movements made by the end-user. Ambisonics lets you rotate the sound field as a whole, rather than having to do this for each individual source in your scene.

（高阶）背景是一种基于场景的技术，这意味着它可以有效地对整个场景进行处理。例如，您的最终混音可能会有几十个声源，您希望对最终用户的移动做出响应。Ambisonics允许您整体旋转声场，而不必为场景中的每个单独的源执行此操作。


Ambisonics is currently used for spatialisation in YouTube 360 and Facebook360. It is also available in the upcoming version 3.0 of VLC Media Player. These offer massive possibility for bringing your VR content to a large audience. Since audio is key to a users immersion in a VR scene it is worth learning how to use Ambisonics. To help you, I have put together a short tutorial here.

Ambisonics目前在YouTube 360和Facebook360中用于空间化。它也可以在即将发布的VLC Media Player 3.0版本中使用。这些都为将您的VR内容带给广大观众提供了巨大的可能性。由于音频是用户沉浸在VR场景中的关键，因此值得学习如何使用Ambisonics。为了帮助你，我在这里编写了一个简短的教程。

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