Decoding Ambisonics in SC

The Decoder

The SC-HOA library features default binaural impulse responses, which need to be loaded first:

// load binaural IRs for the decoder
HOABinaural.loadbinauralIRs(s);

Afterwards, a first order HOABinaural decoder is fed with the encoded Ambisonics signal. It needs to be placed after the encoder node to get an audible output to the left and right channels. This output is the actual binaural signal for headphone use.

~decoder = {HOABinaural.ar(~order, In.ar(~ambi_BUS,~nHOA))}.play;
~decoder.moveAfter(~encoder_A);

Panning Multiple Sources

Working with multiple sources requires a dedicated encoder for each source. All encoded signals are subsequently routed to the same Ambisonics bus and a single decoder is used to create the binaural signal. The angles of all sources can be set, individually.

~encoder_B = {arg azim=0, elev=0;
         Out.ar(~ambi_BUS,HOASphericalHarmonics.coefN3D(~order,azim,elev)*Saw.ar(277))}.play;

~encoder_B.set(\azim,pi/4)
~encoder_B.set(\elev,1)

Exercises

References

2017

  • Florian Grond and Pierre Lecomte. Higher order ambisonics for supercollider. In Linux audio conference 2017 proceedings. 2017.
    [details] [BibTeX▼]