Image

B-Format Hires Rendering

On founding Illusonic, B-Format decoding has been a priority. We have developed hi-resolution 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 audio, B-Fomat (= ambisonics) decoding has gained traction again. Now re-investing in this technology, we have refined it further. It is ready for any product that needs great AR/VR audio.

Image

B-Format Upscaling

Examples of VR microphones are the venerable Soundfield microphone, Tetramic, and recent Sennheiser Ambeo microphones.

These microphones are based on four directional 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 “pro 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.

Image

A-Format Coincidence Correction

The venerable Soundfield microphone and Ambisonics have been an impressively visionary. But an annoying limitation of even modern Soundfield-type microphones arises from the fact that the microphone elements are not precisey located at the same point.

The resulting limitation is that directivity pattern above 2-4 kHz are highly deviating from the desired directivity pattern, impairing overall sound quality.

Illusonic’s A-Format Coincidence Correction time-frequency adaptively aligns the phases of the four microphone elements, such that conversion to B-Format can be applied without interferences and without a need for spectral correction filters.

Image

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.

Image

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