Higher Order Ambionics Stream

Much like B-format sources, the HOA Stream sources allow inputting High Order Ambisonics streams to HOLOPHONIX in a large diversity of formats.

When creating the source, select the order of your stream. The HOA Stream source will be automatically created with the right number of audio channels.

Configure the HOA Stream source to match the characteristics of the input stream with the HOA Stream settings.

Because it is an 'audio stream' type of source (that has no spatial position), it is not associated with an object in the 3D Venue. To input the stream coming directly from an HOA Microphone, use a Zylia or an Eigenmike source. For other types of microphones, you will need to transcode the recording to standard HOA, and use an HOA Stream source.

Audio Parameters#

All parameters are similar for all sources except for the parameters below. Check the sources 'Audio Parameters' section.

Reverb#

The Reverb level sends the W omnidirectional channel of the Ambisonic stream to the reverberation bus. There is no early and cluster simulation for Ambisonic sources.

HOA Stream Parameters#

tip

For AmbiX HOA Streams, set the sorting to ACN and the normalization to SN3D.

Sorting#

Select the sorting (or "channels ordering") of your incoming HOA Stream, between the standards listed below. Choosing the wrong sorting will cause incoherent levels and localization.

  • ACN
  • SID
  • FMH

Normalization#

Select the normalization matching with your HOA Stream from one of the standards listed below. Choosing the wrong normalization will cause incoherent levels, distorted localisation, and can result in signal saturation.

  • FuMa
  • MaxN
  • N3D
  • SN3D

Convention#

The convention sets the orientation of the x-axis to the front or to the right. This adaptation equivalent to a 90° Yaw rotation.

  • Classic where x is in front, is the most common convention.
  • Spat where x on the right, is the convention used in Ircam's tools.

Orientation#

The orientation of the B-Format stream can be adjusted with Yaw, Pitch, Roll, to rotate the entire audio scene. See rotation angles.

Reverb#

The reverb parameter on HOA Stream sources sends the W omnidirectional channel to the reverberation bus. There is no early and cluster simulation for Ambisonic sources.