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Spat Oper / Binaural - Listener aed not audible

Hi,

I am creating a project with live listener movement, using location trackers. I am controlling the Listener orientation (Yaw and Pitch) and that seems to work well. However the listener/aed is visible in Oper viewer but not audible. The point of audition is still the centre of the Oper Grid. Is there a way that the listener can “walk’ towards sources”? I wanted to avoid having to move the sound sources as they are ‘fixed’ in space for this project. If the listener is fixed in the middle, then what is the listener/aed for? I also noticed that listener/xyz also works visually,despite not being in the documentation, but also not aurally.

I have tried direct binauralisation (spat5.spat~ @initwith “/panning/type binaural”) as well as HOA to Binaural conversion (spat5.hoa.binaural~), but the result is the same.

Jan

this listener mode with binaural rendering (6dof) is a built-in mode in Xp - we are using spat and spat5.abs2rel to calculate relative source position, therefore perception, from the listener perspective when it moves

check this video here (Dropbox)

and youtube tutorial (in french) for headtracking

1 Like

Hello Jan,

Indeed, as mentioned by @fraction, you’d have to use spat5.abs2rel.
(In spat5.oper and spat5.spat~, the scene is always listener-centric)
Attached a basic example.

Hope this helps,
T.


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Hi both,

Thank you for that hugely helpful. Would you be willing to look at the patch below? I am getting quite high CPU power use / glitching when the sources are moving. Is there something wrong in the patch or is it that CPU intensive? The tracking data is coming in from Vive trackers. Our idea was to have 5 binaural streams for 5 different users. Would that have to run on separate computers? in your opinion?


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-----------end_max5_patcher-----------

Hi,

The patch looks generally OK, although there are quite a number of error messages that you should fix.

I’m not quite sure why you used [spat5.transform] to apply translation, rather than [spat5.abs2rel].
(not necessarily an issue, but just curious)

For efficiency, it is preferable to use one single message with /xyz rather than 3 separate messages for /x, /y, /z.
As for the CPU power issue, it is often necessary to “speed limit” the incoming data from the trackers (Vive). A speedlimit rate of 40-50 msec might be good enough (of that depends on the scenario/use case).

Can you render 5 binaural streams on the same computer ? That really depends on a lot of parameters. I cannot tell. You need to benchmark empirically.

All the best,
T.

1 Like

Thank you Thibault, much appreciated. I had just debugged the errors and re-updated the patch (probably just after you copied it). This was due to changes I made recently.

No good reason regarding [spat5.transform] V [spat5.abs2rel].

I will fix the triple message issue, and speedlim the tracker input, thank you…