eliott paris

 is pleased to announce the new release of the HOA Library that includes 3D rendering.

The HOA library  (High Order Ambisonics)  is a collection of C++ classes and a set of 

 functions destined to sound spatialization.

The HOA library allows musicians and composers to synthesize, transform and render sound fields in a creative and artistic way. It aims facilitating the understanding and the appropriation of key concepts of Ambisonics. It offers original processing like diffuse sound field synthesis, perspective distortion or spatial filtering and new graphical interfaces. The library is available for Pure Data, Max and as VST plugins.

http://www.mshparisnord.fr/hoalibrary/en/

The HOA library is free, open-source and made available by the 

, the centre of research on musical composition and computer science of the University Paris 8.

The project has been developed as a part of the LABEX Arts H2H at the MSH Paris-Nord and the plate-forme Arts-Sciences-Technologies.

The CICM is pleased to announce the new release of the HOA Library that includes 3D rendering.

The HOA library  (High Order Ambisonics)  is a collection of C++ classes and a set of FAUST functions destined to sound spatialization.

Informations and download : http://www.mshparisnord.fr/hoalibrary/en/

Anne Sèdes
Alain Bonardi
Julien Colafrancesco
Pierre Guillot
Eliott Paris

The HOA library is free, open-source and made available by the CICM, the centre of research on musical composition and computer science of the University Paris 8.
The project has been developed as a part of the LABEX Arts H2H at the MSH Paris-Nord and the plate-forme Arts-Sciences-Technologies.


hoalibrary-v2

Great stuff. Can't wait to try this on a big sound system.

It looks fantastic. What kind of hardware would you need to use this library ? Have you got an example of setup ?

It does look very good; however, I cannot find an "externals" folder in

HoaLibrary-v2.0.1-beta-mac (the first download link for the Mac). The second

download (HoaLibrary) does contain the externals (.mxo's). Were they meant

It does look very good; however, I cannot find an "externals" folder in
HoaLibrary-v2.0.1-beta-mac (the first download link for the Mac). The second
download (HoaLibrary) does contain the externals (.mxo's). Were they meant
to be in the v2.0.1-beta as well?


The download works, but does not contain any external objects if you look through them.

For example, download the HoaLibrary-v2.0.1-beta-mac, unzip it and see if you can find

any external objects (e.g., .mxo's). There is no "externals" folder as there is for the

The download works, but does not contain any external objects if you look through them.
For example, download the HoaLibrary-v2.0.1-beta-mac, unzip it and see if you can find
any external objects (e.g., .mxo's). There is no "externals" folder as there is for the
older versions that can be downloaded.


Btw, Eliott, does it make any sense using this on a quadraphonic sound system? Or is 8-16-... channels necessary?

Also, in the (French) articles on the site I read that central positioning of the listener is crucial for correct perception of the diffuse sound field. But it being a *diffused* sound field, does it really matter to the listener if s/he is not central? Sure the perceived sound will be different, but if as a composer I'm after creating shifting, morphing clouds and masses of sound, not exact spatial positioning, my gut feeling says it's not so important. Is it?

@metaphorz: i downloaded, installed and ran it fine the other day. readme says drop the folder in packages, which is what i did, and you should too ;)

You are right - I am so used to using folders containing .mxo objects.. I did move it to

packages, restarted Max, and now the objects show. I guess I need to read up on "packages".

You are right - I am so used to using folders containing .mxo objects.. I did move it to
packages, restarted Max, and now the objects show. I guess I need to read up on "packages".


@NNIMAR The library is based on the ambisonics model, so ideally you need to have a circular (2D) or a spherical (3D) array of loudspeakers around the listener. However, we offer several decoding modes to match irregular configurations (eg. 5.1, 7.1, stereo, binaural, hemispherical array of loudspeakers..).

@DTR the ambisonic decoding (in 2D) is limited to 3 loudspeakers, so you can use the library in a quadriphonic setup, obviously the more loudspeakers you have more you will improve the rendering of sound fields ! I'm pretty agree with you on the fact that on many cases, if you have diffuse sound field, it doesn't really matter if the listener is not central, however, if you want to spatialize point sources, this may be important so you will have to apply optimizations (like the "inPhase" one) on the sound field if the audience is not ideally placed.

@METAPHORZ in the latest version of the library every externals are embed in a single one named hoa.library (in the "extensions" folder of the package).

Hi all,
Thanks for your comments,
@NNIMAR The library is based on the ambisonics model, so ideally you need to have a circular (2D) or a spherical (3D) array of loudspeakers around the listener. However, we offer several decoding modes to match irregular configurations (eg. 5.1, 7.1, stereo, binaural, hemispherical array of loudspeakers..).

@METAPHORZ in the latest version of the library every externals are embed in a single one named hoa.library (in the "extensions" folder of the package).


I'm trying to setup a simple ambisonic or MIAP 'budget' system to "sustain" visual projections.

I see that you are using genelec auto amplified speakers in 8 or 16... they are very expensive.

https://cycling74.com/forums/4-or-6-channel-ambisonic-budget-speakers-and-amplifiers/

Hi Elliot,
I'm trying to setup a simple ambisonic or MIAP 'budget' system to "sustain" visual projections.
I see that you are using genelec auto amplified speakers in 8 or 16... they are very expensive.
Can you give me some advice?
https://cycling74.com/forums/4-or-6-channel-ambisonic-budget-speakers-and-amplifiers/


Hi, some little questions/remarks ! i'm using the v2

1* in the hoa.optim~ and hoa.3d.optim~ reference there is a typo : in the "Messages" section, there are Basic, maxRe and maxRe again ; but no inPhase. I presume the description of the 2d maxRe applies in fact to inPhase ?

2* Concerning that same object, it s written somewhere that there is a hoa optimisation tutorial ; where can i find it ? Did not find it in the distribution.

3* I suppose you can have several ambisonic encoded signals going out of regular out~ from a poly~, right ? Then you can sum them up and decode them/ apply process/apply optimisation outside of the poly, to all the objects at once, right ?

4* When should i use the hoa.3d.optim ? Is it usefull to use it after a process has been applied (freeverb for instance) ?

1. Thanks for notifying us about that, it will be fixed in the next release.

2. In fact this "tutorial" is not currently in the distribution but in our website, and only in french for the moment (

4. It depends on many things, try the several optims ! Trust your ears !

@vichug sorry for this late response,
1. Thanks for notifying us about that, it will be fixed in the next release.

2. In fact this "tutorial" is not currently in the distribution but in our website, and only in french for the moment (link).

4. It depends on many things, try the several optims ! Trust your ears !


First of all thank you very much for this amazing library.

I have one issue at the moment: most 3D objects do not appear in the object drop down list when I am typing "hoa.3d.".

Of course I can see from the help files most of those 3d objects but it would be useful if these could be on the list when parching.

Is it only me or does anyone else have the same problem?

Also I would really appreciate more tutorials especially for the hoa.process~ object, that is amazing already anyway.

Hello Elliott,
First of all thank you very much for this amazing library.

I have one issue at the moment: most 3D objects do not appear in the object drop down list when I am typing "hoa.3d.".
Of course I can see from the help files most of those 3d objects but it would be useful if these could be on the list when parching.

Also I would really appreciate more tutorials especially for the hoa.process~ object, that is amazing already anyway.


Hi, thanks for your interest about our library,

Do you use Max6 or Max7 ? Auto-completion should work on Max6, but I confirm that it's totally broken in Max7 due to cycling' changes.

We need to find a workaround and publish a new release ASAP.

If you want to learn more about the hoa.process~ I would advise you to take a look at the process examples already implemented.

@BASSIK
Hi, thanks for your interest about our library,
Do you use Max6 or Max7 ? Auto-completion should work on Max6, but I confirm that it's totally broken in Max7 due to cycling' changes.
We need to find a workaround and publish a new release ASAP.
If you want to learn more about the hoa.process~ I would advise you to take a look at the process examples already implemented.
Best regards,
Eliott


I use max 6, maybe it is something due to my installation?

I have started checking the examples and they are very useful thank you.

On the other hand, they mention many tutorials that do not exist anywhere in the installation folder.

One of these for example is the tutorial on the decoder optimization (basic, max Re or inPhase) that is not there but in my view is very useful to understand what type of decoding weights to use.

In particular, I do not know how your binaural coding is implemented and if I have to use the inPhase weighting (typical in the convertion between ambisonics and binaural) or not.

In any case the library is fantastic and sounds equally great!!!

I use max 6, maybe it is something due to my installation?
Anyway not a big issue

I have started checking the examples and they are very useful thank you.
On the other hand, they mention many tutorials that do not exist anywhere in the installation folder.
One of these for example is the tutorial on the decoder optimization (basic, max Re or inPhase) that is not there but in my view is very useful to understand what type of decoding weights to use.
In particular, I do not know how your binaural coding is implemented and if I have to use the inPhase weighting (typical in the convertion between ambisonics and binaural) or not.

In any case the library is fantastic and sounds equally great!!!
Best
Sero


Hello, is it possible to use different HRTFs for the binaural configuration? I can't find any place where the HRTF files are stored.

Is it possible with the library to do upsample of 1st b-format recordings?

Hello,
I have another question if I may.
Is it possible with the library to do upsample of 1st b-format recordings?

the only piece of software for upsampling 1st order to 3rd order that I am aware of is the Blue Ripple Sound TOA Harpex plugin.

well I will check out the TOA plugin as I only knew about Harpex actually.

Thank you Trond.
I thought so but I tried :)

well I will check out the TOA plugin as I only knew about Harpex actually.


@Bassik The only tutorial for the moment is in the extra menu/HoaLibrary. We'll try to add new ones for the next release, some are already done for the PD version. For the optimization, you should look at the help,

Basic optimization (no optimizations) should be used for one listener at the center of "perfect" circle or sphere of loudspeakers (with all the loudspeakers equally spaced) or if you synthesize diffuse sound fields (without punctual sources).

MaxRe should be used for an audience confined in the center of the circle/sphere.

Inphase should be used for an audience that covers all the loudspeakers area with punctual sources.

For binaural, the best is the basic optim. But the binaural rendering of the v2 is really bad and perhaps is it better to use another optimization.

@Glenn No, it's not possible. The binaural responses are "hardcoded" (it's really complicated to dynamically change the responses, we can simplify the C++ library and optimize the process with static responses). Nevertheless, I think some devs are trying to use others responses. And you can try to do it with a patch. The mechanism is really easy and explained here (there's a screenshot of a patch) : 

https://github.com/CICM/HoaLibrary-Light/issues/1.

FYI, we've changed the responses for the next release (we use the IRCAM's bank).

@Trond & Bassik It's almost impossible to increase the "resolution" of the sound field because the informations are missing. The only way to do this is to extract all the sources and their spatial informations and to re-encode with an higher order. And if the sources are encoded with a distance compensation or if there are room effects in the recording, you won't be able able to extract the informations and separate the sources.

If for any reason, you want to increase the order (apply effects on the high order harmonics for example) you should decode without optimizations for a perfect circle or sphere of loudspeakers. The number of "virtual" loudspeakers for the decoding must be at least the minimum number of loudspeakers necessary for the order you want to reach (look at the OrderTool patch in the extras). Then you have to re-encode the loudspeaker channels at the desired order with the angles that match to the loudspeakers.

Hi,
@Bassik The only tutorial for the moment is in the extra menu/HoaLibrary. We'll try to add new ones for the next release, some are already done for the PD version. For the optimization, you should look at the help,
Theoretically :
Basic optimization (no optimizations) should be used for one listener at the center of "perfect" circle or sphere of loudspeakers (with all the loudspeakers equally spaced) or if you synthesize diffuse sound fields (without punctual sources).
MaxRe should be used for an audience confined in the center of the circle/sphere.
Inphase should be used for an audience that covers all the loudspeakers area with punctual sources.
For binaural, the best is the basic optim. But the binaural rendering of the v2 is really bad and perhaps is it better to use another optimization.

@Glenn No, it's not possible. The binaural responses are "hardcoded" (it's really complicated to dynamically change the responses, we can simplify the C++ library and optimize the process with static responses). Nevertheless, I think some devs are trying to use others responses. And you can try to do it with a patch. The mechanism is really easy and explained here (there's a screenshot of a patch) : https://github.com/CICM/HoaLibrary-Light/issues/1.
FYI, we've changed the responses for the next release (we use the IRCAM's bank).

@Trond & Bassik It's almost impossible to increase the "resolution" of the sound field  because the informations are missing. The only way to do this is to extract all the sources and their spatial informations and to re-encode with an higher order. And if the sources are encoded with a distance compensation or if there are room effects in the recording, you won't be able able to extract the informations and separate the sources.
If for any reason, you want to increase the order (apply effects on the high order harmonics for example) you should decode without optimizations for a perfect circle or sphere of loudspeakers.  The number of "virtual" loudspeakers for the decoding must be at least the minimum number of loudspeakers necessary for the order you want to reach (look at the OrderTool patch in the extras). Then you have to re-encode the loudspeaker channels at the desired order with the angles that match to the loudspeakers.

Thank you very much for answering all questions!! Much appreciated.

On the upsampling, I follow your example until the point of re-encoding.

Basically I imagine it as I am using a virtual microphone tool for my encoding.

1) using typical mic directivity (Cradioid or hyper cardioid), in this way I will end up with an high order A format and I am missing the encoding matrix to High order B format...I reckon this is a typical issue with eigenmike? I might not be updated though.

2) using mic directivity that match the spherical harmonics components of the HOA, this would be sweet but I do not know of any virtual mic software who can resemble this directivities.

In the mean time I am trying Harper-B trial to listen to the difference.

Btw the binaural module would be much better with the IRCAM listen set in my view.

@pierreguillot
Thank you very much for answering all questions!! Much appreciated.

On the upsampling, I follow your example until the point of re-encoding.
Basically I imagine it as I am using a virtual microphone tool for my encoding.
There are two ways in my view:

Do you have any suggestion?
In the mean time I am trying Harper-B trial to listen to the difference.
Btw the binaural module would be much better with the IRCAM listen set in my view.

@Pierre: The Harpex algorithm analyses what direction sound is coming from at different frequency bands, and then re-synthesis the spatial information using panning. For this reason the Harpex decoder (harpex.net) results in a decoded sound image with much more articulated localisation of the various sound sources than a regular matrix-based decoding. The Blue Ripple Sound TOA Harpex plugin does something similar: It analyses the location of sound sources within various frequency bands, and then re-encode them to 3rd order.The result is a sound image that is not as articulate as it would be if it was encoded in 3rd order as planewaves from the start, but it certainly helps making source localisations within the sound image more distinct.

What do you want to do ? This will change your approach because the increasing of the order can be a pretty useless operation :

In Ambisonics, the planewaves domain (or virtual loudspeakers channels) and the harmonics domain are equivalent. You can project the sound field onto sur planewaves domain, go back to the harmonics domain, ect. and the restitution will never change even if you increase the order during the operations.

The problem is that all the high order harmonics will be set to zero because the phases of the signal cancel each other out. But it can be "musicaly" interesting if you apply effects in the planewaves domain (You can have a look on the objects [projector~] and [recomposer~] of the library that are, in fact, just a decoder and an encoder with other functionalities).

To answer your question, the microphone directivity that match with an order is "create" by the encoder and the decoder or the projector simulate an optimal miking.

@Bassik
What do you want to do ? This will change your approach because the increasing of the order can be a pretty useless operation :
In Ambisonics, the planewaves domain (or virtual loudspeakers channels) and the harmonics domain are equivalent. You can project the sound field onto sur planewaves domain, go back to the harmonics domain, ect. and the restitution will never change even if you increase the order during the operations.

Yes, I understand and I'm agree but the order and "resolution" of the sound field are not really increased. The plugins improve the restitution for a restitution system. We also use a combination with panning for irregular decoding and yes, it offers a better rendering for some layouts of loudspeaker but it creates artifacts if we come back in the harmonics domain. TOA improves the restitution for 16 channels (with the Harpex's algoritm) and converts them back but I'm not sur that thereafter the operations are more relevant. I mean that the relevance of this approach depends on what you want to do.

@Trond
Yes, I understand and I'm agree but the order and "resolution" of the sound field are not really increased. The plugins improve the restitution for a restitution system. We also use a combination with panning for irregular decoding and yes, it offers a better rendering for some layouts of loudspeaker but it creates artifacts if we come back in the harmonics domain. TOA improves the restitution for 16 channels (with the Harpex's algoritm) and converts them back but I'm not sur that thereafter the operations are more relevant. I mean that the relevance of this approach depends on what you want to do.

Thank you very much for your prompt answer and for the explanation regarding your [projector~] and [recomposer~] objects, very interesting.

Basically I have seen the same approach by Harpex-B (or better said, similar in principles as far as my knowledge and mathematical understanding goes) used in the derivation of Binaural responses for rooms derived from B-format IR.

Basically the approach is to divide the IR in Early and late part and from that derive different binaural responses for different people using HRTF sets.

The Early part of the IR use a direction evaluation algorithm.

http://infoscience.epfl.ch/record/138612/files/2011_Menzer_IEEE%20Trans%20on%20Audio_05456170.pdf

Now, if this is the same idea under Harpex-B, what I understand is that the algorithm can "synthesize" additional spherical harmonics (up to 3rd order) by understanding the direction of arrival of the direct sound.

Given that, I was assuming that the precision of my 1st order recording can be increased and a better 3D sound can be perceived.

So basically what I want to do is having better sounding 1st order recordings because I cannot afford an Eigenmike.

Also this discussion can connect to the binaural coding that is somewhere up in this topic.

not sure how to do it but maybe a more dynamic binaural coding can be more useful than the standard approach of HRTF in the direction of the speakers.

Thanks for the interesting and brain bending discussion anyway, I am really enjoying it.

@PierreGuillot
Thank you very much for your prompt answer and for the explanation regarding your [projector~] and [recomposer~] objects, very interesting.
Basically I have seen the same approach by Harpex-B (or better said, similar in principles as far as my knowledge and mathematical understanding goes) used in the derivation of Binaural responses for rooms derived from B-format IR.
Basically the approach is to divide the IR in Early and late part and from that derive different binaural responses for different people using HRTF sets.
The Early part of the IR use a direction evaluation algorithm.

Now, if this is the same idea under Harpex-B, what I understand is that the algorithm can "synthesize" additional spherical harmonics (up to 3rd order) by understanding the direction of arrival of the direct sound.
Given that, I was assuming that the precision of my 1st order recording can be increased and a better 3D sound can be perceived.

So basically what I want to do is having better sounding 1st order recordings because I cannot afford an Eigenmike.
Also this discussion can connect to the binaural coding that is somewhere up in this topic.
not sure how to do it but maybe a more dynamic binaural coding can be more useful than the standard approach of HRTF in the direction of the speakers.

I've unzipped 2 different versions for mac, and none seem to include a hoa.2d.process~ object!??!?

I see the .maxhelp but nothing else, and all my tutorial patches have a warning in the max window and the object is highlighted in red telling me it can't be found!

Please help, really want to check out these convolution and delay effects!

I've unzipped 2 different versions for mac, and none seem to include a hoa.2d.process~ object!??!?
I see the .maxhelp but nothing else, and all my tutorial patches have a warning in the max window and the object is highlighted in red telling me it can't be found!

Please help, really want to check out these convolution and delay effects!
-G


In the last release, hoa.process is all-in-one and owns hoa.2d.process and hoa.3d.process. Max uses "hoa-objectmappings.txt" in the "init" folder for associating all the names. If it don"t work, it means that the library isn't in your search paths. If want to only use the externals, you should replace "hoa.2d.process" with "hoa.process" that is the real name of the external and an alias for the 2D version (or you can also create "hoa.process" in a dummy patch to notify Max that it should load the object before using "hoa.2d.processing") .

Hi,
In the last release, hoa.process is all-in-one and owns hoa.2d.process and hoa.3d.process. Max uses "hoa-objectmappings.txt" in the "init" folder for associating all the names. If it don"t work, it means that the library isn't in your search paths. If want to only use the externals, you should replace "hoa.2d.process" with "hoa.process" that is the real name of the external and an alias for the 2D version (or you can also create "hoa.process" in a dummy patch to notify Max that it should load the object before using "hoa.2d.processing") .
Cheers


I've been trying to find a way to control sources positions over OSC without any results. How would you do that?

*I mean by using the multi sources panner.

HI guys, can someone advice me on something please;

I have to implement binaural audio in my 3D VR world, and I need to control both sound position and listener position.

The sound object will be a cube (for example), and the listener position will be my Oculus Rift (position and rotation via quat). I have check the HoaLibrary (3D binaural decoder), but it does not give me many controls.

https://cycling74.com/tools/fft-based-binaural-panner/#.VjH-ja7hCHo

 , which seems great. Do you guys know any other Max/Msp alternative to those I have listed, they must be free to use with in Max (not Spat~ because is not free?? please correct me if i am wrong)

I have to implement binaural audio in my 3D VR world, and I need to control both sound position and listener position.
The sound object will be a cube (for example), and the listener position will be my Oculus Rift (position and rotation via quat). I have check the HoaLibrary (3D binaural decoder), but it does not give me many controls. 

Then I found this FFT panner : https://cycling74.com/tools/fft-based-binaural-panner/#.VjH-ja7hCHo , which seems great. Do you guys know any other Max/Msp alternative to those I have listed, they must be free to use with in Max (not Spat~ because is not free?? please correct me if i am wrong) 

Sorry, my account is linked with an old email address and I don't check the notifications.

@SALSA_THE_HUTT You can use "hoa.2d.map~" (or "hoa.3d.map~"). The messages should be ["index of the source " "type of coordinates" "radius or abscissa" "azimuth or ordinate" "elevation or height" (. For example, if you want to place the 1st source with cartesian coordinates (abscissa 1.2, ordinate 2.3 and height 0.1) the message is [1 cartesian 1.2 2.3 0.1( . Or if you want to place the 2nd source with polar coordinates (radius 4.3, azimuth 0.15 and elevation 0.12) the message is [2 polar 4.3 0.15 0.12(. Every messages should be explained in the reference of the object but if you need more help, you can post a patch.

@FRANKY REDENTE I don't really see how a sound object can be a cube (one source at each corner ?). Anyway, if you want to place and move sources in a sound field, you should use the "hoa.3d.map~" and you can use the GUI "hoa.map" to create a group and to perform translations and rotations.

Hi,
Sorry, my account is linked with an old email address and I don't check the notifications.

@SALSA_THE_HUTT You can use "hoa.2d.map~" (or "hoa.3d.map~"). The messages should be ["index of the source " "type of coordinates" "radius or abscissa" "azimuth or ordinate" "elevation or height" (. For example, if you want to place the 1st source with cartesian coordinates (abscissa 1.2, ordinate 2.3 and height 0.1) the message is [1 cartesian 1.2 2.3 0.1( . Or if you want to place the 2nd source with polar coordinates (radius 4.3, azimuth 0.15 and elevation 0.12) the message is [2 polar 4.3 0.15 0.12(. Every messages should be explained in the reference of the object but if you need more help, you can post a patch. 

HI there, thank you for the reply. I have already achieved what i need using the free FFT Panner,

Can't see how a cube can be a sound object? check the screen shot.

HI there, thank you for the reply. I have already achieved what i need using the free FFT Panner,
Can't see how a cube can be a sound object? check the screen shot.


Btw I have checked, the example you have mentioned. None of the patches shows how to add listening position and quaternion (rotation via head tracking). It would be nice to implement something that would give users a practical example on how to use this library with e.g. Oculus Rift or any other VR headset/scenario.

I think is about time that we start considering VR has a credible platform for content created in Jitter and Max. Especially since all other companies are miles ahead (Unity, Unreal, FMod, Wwise, 3D Ception ..and the list goes on )

Btw I have checked, the example you have mentioned. None of the patches shows how to add listening position and quaternion (rotation via head tracking). It would be nice to implement something that would give users a practical example on how to use this library with e.g. Oculus Rift or any other VR headset/scenario.
I think is about time that we start considering VR has a credible platform for content created in Jitter and Max. Especially since all other companies are miles ahead (Unity, Unreal, FMod, Wwise, 3D Ception ..and the list goes on )

I have already implemented myself an headtracker with the library.

http://www.rcgroups.com/forums/showthread.php?t=1677559

my issue is that I cannot get max to read the data from the arduino so I have used a pd patch from Mathias Kronlachner, who is also the creator of another tool for ambisonics called Ambix: 

http://www.matthiaskronlachner.com/?p=2091

in this way I have obtained a very good binaural image with teh headtraking device.

but (there is always a but...) HOA do not have a 3D ambisonics panner (only a 2D), while Mathias has created one in vst~ (check into the plug-in suite: 

http://www.matthiaskronlachner.com/?p=2015)

 and it is in 3D, based on the researched developed at IEM in Gratz (great place for ambisonics).

Also regarding having dimensions to the sources (correct me if I am wrong but ambisonics is based mainly on point sources), I have played with this system last year 

and they have achieved something similar to what you are requesting.

The problem is that they use a different immersive sound technique to ambisonics that allows easier coding for dimensions of sources...

the HOA library is great but if I may, I reckon you shall try to implement a 3D ambisonics panner and a better binaural module.

I am personally using my own binaural module that I have done in Max but it is a bit computational expensive so maybe something directly coded in an object might be more efficient.

It would be especially interesting if HRTF can be changed maybe using the CIPIC HRTF database with different subjects (

http://interface.cipic.ucdavis.edu/sound/hrtf.html)

Regardless all of this, I can assure you that I am having a lot of fun with the library and I am building a great tool for performance.

I would love to exchange ideas with anyone interested.

I have already implemented myself an headtracker with the library.
it is based on this: http://www.rcgroups.com/forums/showthread.php?t=1677559

my issue is that I cannot get max to read the data from the arduino so I have used a pd patch from Mathias Kronlachner, who is also the creator of another tool for ambisonics called Ambix: http://www.matthiaskronlachner.com/?p=2091

but (there is always a but...) HOA do not have a 3D ambisonics panner (only a 2D), while Mathias has created one in vst~ (check into the plug-in suite: http://www.matthiaskronlachner.com/?p=2015) and it is in 3D, based on the researched developed at IEM in Gratz (great place for ambisonics).

Also regarding having dimensions to the sources (correct me if I am wrong but ambisonics is based mainly on point sources), I have played with this system last year http://4dsound.net/
and they have achieved something similar to what you are requesting.

@Pierre Guillot
the HOA library is great but if I may, I reckon you shall try to implement a 3D ambisonics panner and a better binaural module.
I am personally using my own binaural module that I have done in Max but it is a bit computational expensive so maybe something directly coded in an object might be more efficient.
It would be especially interesting if HRTF can be changed maybe using the CIPIC HRTF database with different subjects (http://interface.cipic.ucdavis.edu/sound/hrtf.html)

Regardless all of this, I can assure you that I am having a lot of fun with the library and I am building a great tool for performance.
I would love to exchange ideas with anyone interested.


I have managed to make my patch using this patch (comes with 4.7 Gb of HRTF).

https://cycling74.com/tools/fft-based-binaural-panner/#.VjoZoa7hCV4

This can read quat, listener position and multiple sound sources in real time.

Re: idea exchange, if you own an Oculus Rift and Lepmotion, write me on f.redente@sae.edu

I will be more then happy to let you try the patch once is on test

HI Bassik,
Thank you for info.
I have managed to make my patch using this patch (comes with 4.7 Gb of HRTF).
https://cycling74.com/tools/fft-based-binaural-panner/#.VjoZoa7hCV4
This  can read quat, listener position and multiple sound sources in real time.

Re: idea exchange, if you own an Oculus Rift and Lepmotion, write me on f.redente@sae.edu
I will be more then happy to let you try the patch once is on test

thanks for the offer but I do not own any of the devices.

I am more a guy for open source projects but if you would like to share ideas, I am up for it.

thanks for the offer but I do not own any of the devices.
I am more a guy for open source projects but if you would like to share ideas, I am up for it.


"Can’t see how a cube can be a sound object? check the screen shot."

I thought you were inside a cube, but your image make me think you consider the cube as point source (but perhaps I'm wrong). In this case, the cube could be a sphere or a pyramid, this doesn't matter, you want to spatialize a source around the listener. You can use [hoa.map] and if you want to take into account the rotation of the head, you can do something like that : new angle of the source = angle of the source - angle of the head. Because if your head moves to the right, we can also consider that your head doesn't move but that the source moves to the left (question of relativity). Anyway the FFT Panner seems to suit you, so this is just a suggestion.

"Btw I have checked, the example you have mentioned. None of the patches shows how to add listening position and quaternion (rotation via head tracking)...."

Thanks for suggestion, I hope one day we'll have time to do this but this is not in our to do list. The problem is that we have a lot of other projects and it takes a lot of time to create and maintain such a library (for Pure Data, Max, FAUST, etc. with help files and documentations...) and with Eliott, we sometimes want to have time to have a drink and become philosophers.

"Can’t see how a cube can be a sound object? check the screen shot."
I thought you were inside a cube, but your image make me think you consider the cube as point source (but perhaps I'm wrong). In this case, the cube could be a sphere or a pyramid, this doesn't matter, you want to spatialize a source around the listener. You can use [hoa.map] and if you want to take into account the rotation of the head, you can do something like that : new angle of the source = angle of the source - angle of the head. Because if your head moves to the right, we can also consider that your head doesn't move but that the source moves to the left (question of relativity). Anyway the FFT Panner seems to suit you, so this is just a suggestion.

"Btw I have checked, the example you have mentioned. None of the patches shows how to add listening position and quaternion (rotation via head tracking)...."
Thanks for suggestion, I hope one day we'll have time to do this but this is not in our to do list. The problem is that we have a lot of other projects and it takes a lot of time to create and maintain such a library (for Pure Data, Max, FAUST, etc. with help files and documentations...) and with Eliott, we sometimes want to have time to have a drink and become philosophers.

I understand, the Hoa library is indeed a great piece of work.

HoaLibrary v2