Descriptors comparison (oldschool vs newschool)

So I’m thinking that in the short term it might be better to just use the vanilla descriptors~ for real-time use, but use the fluid.descriptors~ stuff to create the database. It wouldn’t be apples-to-apples, but since I’m comparing an 11ms onset to a >8s sample, I don’t think it matters too much.

BUT

In doing some more detailed comparisons, I’m getting some funky values from descriptors~. (hoping @a.harker can shed some light on this).

A stripped back test patch posted below, but here are my results for various tests.

First, a 25ms burst of pink noise scaled to 0.01 amplitude:

Pretty good, pretty good.

Here is the is the same length burst but scaled to 2.0 amplitude:

descriptors~ reports, um, a quieter sound…
(to be fair, I do sometimes get a value in the -50dB range for descriptors~, but it varies pretty wildly, and is very close to the 0.01 burst either way)

Next up is a fixed white noise burst (so it’s always the same sample), of either 10ms or 20ms in length (results are comparable).

First at 1.0 amplitude:

Next at 5.0 amplitude:

Again, descriptors~ reports a very small difference in loudness.

Last couple tests are with pitched material. First a 55ms 880Hz sine wave at 0.5 amplitude:

Perceptually I put this in line with a noise burst at 1.0, which is around where fluid.bufloudness~ is reporting it. descriptors~ has this almost as low as the nearly inaudible 0.01 pink noise burst.

Finally 55ms 770Hz saw wave at 0.5 amplitude:

Similar results to the sine wave test, but it’s worth mentioning that running the test over and over again results in a +/- of around 1dB for fluid.bufloudness~ but descriptors~ shows a variance of closer to +/- 4dB.

Here is the code for the test patch:


----------begin_max5_patcher----------
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-----------end_max5_patcher-----------

//////////////////////////////////////////////////////////////////////////////////////////////

I remember there was some discussion about @tutschku’s loudness test at the last plenary, but no details about it specifically. And @tremblap has reported some similar (sounding) issues with descriptors~‘s (descriptors~’?) loudness in the past, so I’m wondering if this is the same problem and/or if this is intrinsic to how descriptors~ works, or if there is a problem in the algorithm somewhere.