[PD] overdriven speaker

Martin Schied crinimal at gmx.net
Fri Oct 22 15:59:20 CEST 2010

  On 22.10.2010 06:05, Mathieu Bouchard wrote:
> On Fri, 22 Oct 2010, Martin Schied wrote:
>> I wanted to use a fairly high a < 1 because then the phase for all 
>> frequencies is approximately 90° off like for the ideal a=1. Using 
>> slightly smaller factors and comparing input / output didn't satisfy 
>> my expectations. maybe that would't matter at all - let's experiment...
> How is the phase preservation an important thing for you ? I ask 
> because I didn't really think of it as important... (and I still 
> somewhat don't know when it's really important).
I think it's not important for a speaker simulation either, but my 
assumption was that a correct behavior in phase would be a "sign" of a 
working integrator.
>> that's indeed interesting. So the gain is defined for a constant 
>> signal having the same input and output samples (or in other words DC 
>> having no amplification) if I understood it correctly.
> It's defined for any signal. There are different equivalent ways to 
> define the gain of a linear filter. In my head, I was thinking of an 
> input signal containing a single 1 in a sea of zeroes... but it might 
> be a bit easier to understand it using a constant input signal. Then 
> for [sig~ 1], [rpole~ 1] will diverge (as much as the float32 number 
> format can allow it to...) because 1/(1-1) is undefined (it's a 
> division by zéro). But for [sig~ 1] again, [rpole~ 0.999] will output 
> a constant 1000.
that's the way I understood it. fine!

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