Ambisonic upsampler

mmmoth · 02-17-2022, 10:33 PM

Is there an opensource ambisonic upsampler from 1st order to 3rd or higher out there?

Not the compass upmixer in the sparta plugin distribution.

plush2 · 02-18-2022, 08:40 AM

So I'm assuming not the HO-DirAC one from Sparta either?

I'm not aware of any others that are free to use.

mmmoth · 02-19-2022, 03:45 AM

Yes that's right.

The compass upmixer should be less intensive than the hoa-dirac upmixer, which has settings for directionality.

mmmoth · 03-24-2022, 08:38 PM

Looks like the IEM Toolbox that comes as a utility is great for this. It's much lighter on cpu load than the compass upmixer by about 10%, so that's great

Kewl · 03-25-2022, 07:36 PM

The IEM ToolBox is not an upmixer/upsampler. Maybe describe what you expect from an "upmixer" or "upsampler"?

mmmoth · 03-27-2022, 10:35 AM

A converter from a lower order ambisonic source to a higher order ambisonic output?

Kewl · 03-27-2022, 12:56 PM

So, then, upmixing, or upsampling, involves extrapolating data.

HARPEX, COMPASS, HO-DirAC are parametric signal processing that can be used to extrapolate lower order stream to higher order. AFAIK, they are the only processes readily available to do such a job.

The IEM ToolBox has a feature that will change the gain ratio in the 1st order stream (channel W vs channels XYZ) to allow more accurate decoding when a 1st order stream is decoded by a higher order decoder, like a 3rd order decoder. Such a situation can occur when you're mixing higher order content with 1st order content.

mmmoth · 03-28-2022, 12:37 AM

Did an A/B test, you're right. The toolbox doesn't preserve the spatiality that the compass upmixer does. Interesting. Thanks that was a great help!

Now to find an upmixer that use less cpu load

02-17-2022, 10:33 PM	#1
mmmoth Human being with feelings Join Date: Feb 2022 Posts: 65	Ambisonic upsampler Is there an opensource ambisonic upsampler from 1st order to 3rd or higher out there? Not the compass upmixer in the sparta plugin distribution.

02-18-2022, 08:40 AM	#2
plush2 Human being with feelings Join Date: May 2006 Location: Saskatoon, Canada Posts: 2,113	So I'm assuming not the HO-DirAC one from Sparta either? I'm not aware of any others that are free to use. __________________ mymusic http://music.darylpierce.com mywork http://production.darylpierce.com mypodcast https://youtube.com/@ultimatesoundtest

03-25-2022, 07:36 PM	#5
Kewl Human being with feelings Join Date: Jan 2009 Location: Montreal, Canada Posts: 171	The IEM ToolBox is not an upmixer/upsampler. Maybe describe what you expect from an "upmixer" or "upsampler"? Last edited by Kewl; 03-26-2022 at 02:52 PM.

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02-19-2022, 03:45 AM	#3
mmmoth Human being with feelings Join Date: Feb 2022 Posts: 65	Yes that's right. The compass upmixer should be less intensive than the hoa-dirac upmixer, which has settings for directionality.

03-24-2022, 08:38 PM	#4
mmmoth Human being with feelings Join Date: Feb 2022 Posts: 65	Looks like the IEM Toolbox that comes as a utility is great for this. It's much lighter on cpu load than the compass upmixer by about 10%, so that's great

03-27-2022, 10:35 AM	#6
mmmoth Human being with feelings Join Date: Feb 2022 Posts: 65	A converter from a lower order ambisonic source to a higher order ambisonic output?

03-28-2022, 12:37 AM	#8
mmmoth Human being with feelings Join Date: Feb 2022 Posts: 65	Did an A/B test, you're right. The toolbox doesn't preserve the spatiality that the compass upmixer does. Interesting. Thanks that was a great help! Now to find an upmixer that use less cpu load