amplitude leveldetection in chuck?

[Acoustic Interloper]

Any suggestions on how I'd go about detecting low-amplitude periods in an incoming audio stream, where my Chuck code gets to decide the hi-to-low and low-to-hi threshold values? I have an application that is using Lisa to buffer sound thanks to some help from this forum about a half year ago. Now I'd like to scan the audio, either as I am buffering it to Lisa or else after it's buffered in Lisa, for periods during which the amplitude goes below some threshold. I've looked through the docs and nothing obvious jumped out at me. Seems that I shouldn't have to go into frequency domain, since all I care about is overall level.

Thanks in advance.

[Antimon]

A brute force method is what first comes to mind:

(pseudoish code)

[Acoustic Interloper]

[Acoustic Interloper]

Did a bit of reading the chuck docs -- I get back to this project a few times a year -- it looks like if I call the ugen.last() periodically (but not for every sample) and keep a rolling average of that value, it might get me what I want. Something to try

[Antimon]

yeah last works on dac as well:

dac.last() => int lastSample;

and lisa:

lisa.last() => int lastOutOfLisa;

I do functions that does simple stuff every sample occasionally. Something simple like this shouldn't bring it down too much - ChucK seems designed to handle this kind of stuff (though of course having it in native C will add less overhead). And of course the tight timing built into it makes it work like a charm.

/Stefan

[Acoustic Interloper]

Thanks for your help! I put in a statistical sampling trace of adc.last() -- I only need to "sample the samples," so to speak -- this should work just fine.

One of these summers I am going to have enough time to actually get good at Chuck.

Have a good weekend.