[chuck-users] Filter screaming: danger to hearing

Kassen signal.automatique at gmail.com
Sat Nov 28 14:24:08 EST 2009


I'm aware that this is what happens what a filter is set at a negative
> value, and I guess from this example that the same thing happens at high
> filter values. (Maybe the value is looping?) I've never noticed this problem
> when the filter is keep > 0 and < 10000, so I think you can avoid it like
> that until a fix is given. But yes, the resulting sound is always at max
> volume.
I believe that at least LPF can become unstable at lower frequencies (I
still need to confirm this). Most likely the stability of the filter at
given frequencies will also depend on the sample-rate is I'd suggest
supplying yours when giving this kind of example. In this case 44.1K v.s.
48K can make a big difference, I suspect

IMHO it would be good for these filters (LPF, BPF, etc) to confirm that the
coefficients resulting from the requested parameters actually result in a
stable filter.

As a side-note, I tend to monitor through a mixer with the soundcard at full
volume and the hardware faders down to a reasonable level and only use
headphones directly from my laptop when on the move. Even then I will rarely
start code I'm not sure about with headphones on. Our ears may well need to
service us for another half century or -hopefully-  more. That's a long time
for a precision instrument that can easily take the state of the art in
technology to task in many regards.

Perhaps it's not necessary to note this again but Tomasz's description of
the blast he got scared me a bit.

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