Ambisonic Field Recordings

  • By: Thorsten Meyer
  • Date: Tuesday, 28 September 2021
  • Time to read: 4 min.

Ambisonic’s 360deg surround sound format is a more conventional stereo surround sound that captures full directional information when sound waves hit the microphone, including elevation information, ideal for immersive audio applications. Ambisonics is a 360-degree ambient sound format that is more conventional than stereo surround sounds and records complete directional information when the sound wave hits the microphone (including elevation information). Recorded Ambisonic recordings can be manipulated in post-production to create 360 degree ambient sound landscapes, which is highly desirable and makes AmbisonICS ideal for more immersive audio applications.

The theory and practice of ambisonic recording were developed in Britain in the late 1960s and early 1970s, with the first pitch ambisonic microphone invented in 1975 by Michael Gerzon and Professor Peter Craven and developed for commercial release in 1978. Ambisonic remained a high-quality niche until the advent of virtual reality and 360-degree video applications with the release of the Soundfield Rode NT-SF1 Ambisonics Microphone.

The Ambisonic B format is an audio format used for VR, AR, Facebook, YouTube, and 360-degree videos. It is the industry standard for recording, mixing, and playback of full spherical (360 degrees) sound fields. Terahedral microphones have become popular among recording engineers working with Stereo 5.1 outside of ambisonics due to their flexibility in post-production, and the B format can be used as an intermediate product of virtual microphones.

In the first order, it is no longer possible to obtain the ambisonic components from a single microphone capsule. In the higher-order, the differential signal can be derived from several distributed omnidirectional capsules through sophisticated digital signal processing. Random microphones generate a stereo surround image with direction and time differences between the capsules.

In this format, the first set of signals generated by a sound field microphone is a capsule in the microphone array. This gives us the full range of directional information necessary to generate the sound field.
The decoding interface in VVmic offers unique flexibility to simulate a virtual microphone and highlight tones. The decoding tab in our VVMIC software gives us the ability to decode files in A / B format into a certain number of output channels, depending on our production requirements, and this is the area that lies in the unique flexibility that makes sound-field microphones so interesting. Each sound field contains a file in which we highlight the sound directions generated by the virtual microphone in our capsule array and output them as a number of signals.

This opens up many ideas and possibilities for VR sensor devices to add additional spatial and visual layers to the field recording experience. Ambisonic Field Recording is on the rise as more and more projects include AR, VR, and 360 sound. An absolutely advanced field recording experience that zooms in on different layers of visual and acoustic information can greatly enhance the VR audience experience.

This expanded field recording project explores and expands the current practice of sound art and field recording into the visual realm by experimenting with VR and 3D technologies. This project will make it possible to experiment with many new technologies in the laboratory and in the field, and through these experiments, we will develop new technological applications that will be incorporated into future projects. Ambisonic Field Recording is a method that uses four microphone capsules to capture full 360-degree surround audio playback.

This article by Tom Lowe starts with a look at the basics of ambisonic sound, how to start recording sounds in ambisonics and which ambisonics format to consider.

An immersive sound format that allows you to have an audio surround for the listener. Ambisonics does not transmit audio across channels based on panning to specific channels or responds to a fixed number of speakers, unlike other multichannel surround formats. Ambisonic microphones capture the sound in full 360o, and they are 360o to give you altitude information.

The only reason I use ambisonics is that I think it’s better to have surrounded in a VR-compatible recording scenario than just having stereo or mono. For the ambiance, I try to avoid ambisonic microphones as much as possible.

Ambisonal decoders are not significantly marketed to end-users, nor are native ambisonic recordings available. Content produced with Ambisonik is made available to consumers in stereo, discrete and multi-channel formats.

Ambisonic hardware is rare, expensive, cumbersome or a combination of both. Ambisonics were first developed under the auspices of the British National Research and Development Corporation in the UK in the 1970s.

Mike used the ST250 version of the original soundfield microphone, which was designed to be well suited for local recording. It took some time to combat the problem of resolution with four capsule microphones, as each microphone was more sensitive than a normal microphone. The result was a loud and muffled sound quality, so we switched to the Rode SF1 Mixpre 6 recorder.

I think there are a number of misunderstandings, but the possibility of recording in a flexible format at a low price is very tempting. There have been a lot of experiments, a lot of gear shootouts (they’re my two-cent solution for surround environments in VR), ambisonic microphones, and other random surround setups, but I’m not one of them. Let’s start with a few basic things that are misunderstood.

The project to extend the field protocols of BJ Nilsen examines and experiences the landscape over time, intensifies and expands through work in VR and 3D technology. The sites and landscapes of interest to the project are former industrial sites such as landfills, military sites, and sites that have been redesignated, rendering old functions and the associated history invisible to the viewer.

It is a compact speaker system based on world-class 3D audio technology, ambisonic HoA. The Zoom H3 VR Ambisonic Recording Module offers robust functionality in a small package.

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