Hey all,

Very basic question, I'm sure. I am trying to track the amplitude of an incoming signal using [sigmund~]. I'd like to measure time between attack and release, and also measure time between release and the next attack. Hopefully will use live input evenutally, but I''ve just set it up with a phasor~ for now. Problem is that the amplitude outlet of sigmund follows the envelope I set up for phasor~ (although it only ramps up to around 0.3, rather than 1, why is that?), but after it is finished, it returns again to the initial value (around .3), rather than remaining at zero, and I'm not sure why. Here is what I have set up:

[440(
|
[t f b]
| \____
| \
[phasor~] |
| [0, 1 150, 0 1000 150(
| /
| [vline~]
| /
| /
[*~ ]
|
[sigmund~ notes env]
| |
[bang( [dbtorms]
|
[0 \ <-------this value won't stay at 0 between notes

Thanks for your help!

That patch works just fine for me. Are you sure you didn't make any mistakes?

Also, the reason why it only goes to .3 is because the amplitude tracking in [sigmund~] doesn't simply give you the maximum raw amplitude, it gives you something along the lines of a perceived loudness, like RMS is supposed to do (I don't actually know if [sigmund~] uses RMS). Just because a signal hits an amplitude of 1 at some point doesn't mean it sounds that loud. All of those lower amplitude samples have an influence as well.

Thanks for the reply Maelstorm. I checked the patch again, and it seems to be set up in the same way as the diagram. What I'm seeing on my system now is that the amplitude outlet of [sigmund~] is showing wildly fluctuating values between 0 and 1 when it should (I think) be resting at zero after each note's envelope is complete. I'm wondering if there is something screwy with the audio on my computer or something. I've attached the patch and also a screenshot showing some values it was producing when run on my system. Also, when I created another [sigmund~] in the same patch without connecting a signal to it, its amplitude outlet was also spitting out the same fluctuating values, apparently in unison with the first sigmund (but the pitch outlet stayed at 0). Any thoughts?

Thanks a lot!

http://www.pdpatchrepo.info/hurleur/sigmund_amplitude_track.pd

Thanks for the reply Maelstorm. I checked the patch again, and it seems to be set up in the same way as the diagram. What I'm seeing on my system now is that the amplitude outlet of [sigmund~] is showing wildly fluctuating values between 0 and 1 when it should (I think) be resting at zero after each note's envelope is complete. I'm wondering if there is something screwy with the audio on my computer or something. I've attached the patch and also a screenshot showing some values it was producing when run on my system. Also, when I created another [sigmund~] in the same patch without connecting a signal to it, its amplitude outlet was also spitting out the same fluctuating values, apparently in unison with the first sigmund (but the pitch outlet stayed at 0). Any thoughts?

Thanks a lot!

http://www.pdpatchrepo.info/hurleur/sigmund_amplitude_track.pd

Man, that is weird. Your patch works just fine here, running on OSX 10.5. What OS are you using?

Can someone else try this on their OS and see if you are getting similar results? Just so we can find out if this is an OS-specific bug, then a bug report can be filed.

As an alternative, skrame, maybe you can try [fiddle~], as it will give you notes and amplitude as well.

I'm on Windows 7 here. I'll try out [fiddle~] shortly. Thanks.

It's working here too : pd-ext 0.43.1 on ubuntu 11.10 x64.

works here too. pd-vanilla 0.43.0 + winxp