Buzzing feeedback

[jam93]

Hello,

When I try to load 3 files i get a feedback click buzz? I also get the same pollution when i do two files and add delay to one? Is it a problem with my computer or the code itself?

[Frostburn]

Can you post the code that causes this. It's hard to guess what the problem is if you don't have the source at hand.

[jam93]

[kijjaz]

Ahhh!! is it digital clipping? (too much overall amplitude at dac)
(maybe the overall dac value goes beyond the range -1 to 1)

[jam93]

are the different instances of a program additive. does the signal from two SinOsc from two programs add in processing?

[Frostburn]

Yes. All the signals are summed to the output. The file can be the same. Then there just will be many such shreds.

[jam93]

How can I prevent the digital clipping If I lower the gain I can make two instances work but three do not even if I turn down the gain by 5 orders of magnitude.

[kijjaz]

I think we should have a way to perform "limiting" on dac's own gain value!
If we can have a shred running forever and doing that job, it'd be cool.

Or how can we integrate Dyno's limiter into the system?

my idea is this:
dac => Dyno limiter => blackhole;
limiter.limit();
limiter.gain(.95); // just in case it jumps that fast

then, each sample, perform a not-too-complex comparison of dac.last() and limiter.last()
maybe something that involve dividing them..
and using the outcome to modifie dac.gain in real-time?

hmm.. i'll come back to read about this later.
i still don't have time to experiment with it.

[Inventor]

Yes, I haven't seen a self-regulating gain block, but it sure would be useful. Such as:

[Inventor]

I tested the provided code, thanks jam93, in the Mac miniAudicle and even the first instance was horribly noisy. I think you have some feedback issues, though I didn't follow your code exactly. Adding more shreds just makes the feedback worse, and yes, the first two sound alike. I'd say look at the feedback to see if it isn't too strong.

[moudi]