B-Format Hires Rendering
On founding Illusonic, B-Format decoding has been a priority. We have developed hi-resoution B-Format decoding since 2006. Though the market was not ready, but off-spring derivative beamforming techniues made it to commercial pro-audio products from Schoeps (SuperCMIT) and Sennheiser (Esfera).
We are pleased to see that thanks to demand vor virtual reality (VR) audio, B-Fomat (= ambisonics) decoding has gained traction again. Re-investion on this technology we have refined it further, ready for any product that need great VR audio.
Examples of VR microphones are the venerable Soundfield Microphone, Tetramic, and recent Sennheiser Ambeo microphone.
These microphones are based on four direction microphones located on a tetrahedron. They offer first-order ambisonic (B-Format) signals, suitable for VR audio.
The most known higher-order VR microphone is the Eigenmike. While offering higher order HOA signals, it suffers from basic audio quality. While a Soundfield microphone is based on directional microphone elements quite expensive, a higher order microphone is based on cheaper omni-directional microphones.
Unfortunately, there is the trade-off between “prod audio channel quality” and higher order directionality.
Illusonic B-Format Upscaling offers the best of both worlds: pro audio channel quality and high order directionality. It is implemented by using high quality first order microphone and signal processing for extension to higher order.
A-Format Coincidence Correction
The venerable Soundfield Microphonea and Ambisonics have been an imprressively visionary. Tough an annoying limitation of even modern Soundfield-type microphones, arises from the fact, that the microphone elemets are not precisey located at the same point.
The resulting limitation is that directivity pattern above 2-4 kHz are highly deviation from the desired directivity pattern, impairing overall sound quality.
Consumer B-Format Capture
Do you need VR audio capture in a VR camera product?
Realistic form factor and physical consideration will dictate that you can’t use directional microphone like a Soundfield microphone.
Thus you need to obtain as good as possible B-Format/HOA signals based on 4 or more omni-directional microphones. Illusonic signal-processing will provide the optimal conversion with broadband aliasing-free directivity pattern.
VR Soundbar (XTC)
If you want to render VR-audio (binaural) over loudspeakers, Illusonic crosstalk-cancellation filters will do the job surprisingly well:
– a single person in the sweet spot gets a full 3D VR sound experience
– while listener everywhere else get a correct coloration-free sound