Pachyderm Acoustic

Comment

Comment by Arthur van der Harten on December 1, 2022 at 5:57pm

Hi Daniel,

I haven't heard from you in a while. Welcome back!

Some time ago, I added Echo Kriterion, which was difficult because I don't speak German. Happily, my friends at Politecnico di Torino worked through their network to get a colleague to translate it for me, and that translation is what Pachyderm's implementation is based on.

Yes - Echo Kriterion is based on the paper by Dietsch and Kraak. They made a few assumptions about echoes, and came up with a means for processing the impulse response so that you can get an idea of whether sound at any time exceeds a certain threshold that may correlate with perception of echo. It is empirical in nature, which means they tested some examples on a cohort of individuals, and decided on that basis that at some value, 50% of people will hear an echo for speech or music, respectively, and then decided on another value at which 10% of people would hear an echo. True or false answers the question "Will XX% of people hear an echo if speech/music is heard at this location?" True = yes. False = no.

Now - how accurate is it? I did not modify the implementation from what was specified in the paper, but I wouldn't trust the results outright. The study had a relatively small sample size (as most papers in acoustics do, usually) and I bet the method could use further review, verification, and perhaps some fine-tuning or improvement.

Here is how I use it - if it says True, there probably is an echo... however, if it says False, that doesn't mean there isn't one.

Arthur

Comment by Daniel Horta on December 1, 2022 at 5:18pm

Hi Arthur, hope everything is fine.

I was reading the work from Lovstad about Echo Criteria trying to understand how the concept from Dietsch and Kraak is implemented in Pachyderm. 

I have to be honest and say that I don't have the necessary knowledge to fully understand the text yet. So I would love some explanation about the Echo Criterion Parameter of analysis in Pachyderm. How should I interpret it and what it means to the acoustical qualities of the space score "false" or "true" in this criterion?

Thank you in advance, cheers. 

Comment by Arthur van der Harten on November 15, 2022 at 7:19am

Hi kyujin,

For geometrical methods, no. That's what you get.

Other frequencies are possible with the numerical methods, though. Some of that functionally isn't released yet, but if you play with pach_numerictimedomain, you will see what I mean.

Arthur

Comment by Kyujin on November 15, 2022 at 3:34am

Hi, I was wondering if there's a way to adjust the scope of the octave band frequency. It is set as a default 0=62.5Hz, 7=8000Hz. Does the component allow input of higher/lower frequency? Also, would it be possible to plot 1/3 octave band with this plugin? Thanks in advance!

Kyujin

Comment by Arthur van der Harten on November 7, 2022 at 5:06am

Hi TC,
It depends on what you wanted to achieve. If you are simulating a sound system, then you really need to get the three source objects into the same impulse response. Come to think of it, that would be easier to do in the rhino interface, so I suggest you do your simulation there.

However, if that isn't the case, I wouldn't average but treat them as three separate results.

Arthur

Comment by TC.A on October 31, 2022 at 9:31pm

Hi, I'm trying to use pachyderm to study an existing space. How do I deal with sources when I have multiple points of sound source (ie multiple speakers within the room)? When I set multiple points in grasshopper, the node StatRec turns red. It does work when I tried graph the Pt node but I get separate results for each source point, should I flip the tree and average the results for each frequency? Thank you very much!

Comment by Kousai Tashani on October 31, 2022 at 4:29am

hello Arthur 
İ sent you an Email please check your email or spam box. 
thank you for your support :)  

Comment by Arthur van der Harten on October 27, 2022 at 9:38am

Hi Kousai,
That's something about your model. It might happen in an extremely hard room, or a space where rays are getting stuck.
Can you send it to me?
info@orase.org
Arthur

Comment by Kousai Tashani on October 27, 2022 at 9:19am

hello Arthur, 
its been ve exciting using the Pachyderm for a week now, 
first of all thank you for developing the plugin. 

I am facing a problem While using pachyderm through rhino. 
in the hybrid mode window and after setting up all the settings I normally click "Calculate solution" 
it takes action in the command line till i see " Preparing threads" and its stuck there. its not going anyfurther. 

is there anyone facing the same issue and having a solution for that? 

grasshopper is working fine so far i guess!! 

thank you all 

Comment by Arthur van der Harten on June 5, 2022 at 6:10pm

Robin,
The selected color scale works with the 'preview' option. If you use the buttons at the bottom of the form, it uses actual geometry, which does use the current layer.

Daniel,
Variegation allows you to select a characteristic dimension for the surface scattering or roughness. This might be the depth of relief, or have something to do with the size of flat portions. That dimension is the quarter wavelength of above which scatterering is very high, and below which it is very low.

Convergence - minimum convergence takes portions of the impulse response and determines how much it has changed at intervals. When the degree of change is below a certain threshold for 10 consecutive checks, then the simulation can be said to have converged sufficiently.

Let me know if you have questions.

Arthur

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