Re: [Linuxsampler-devel] Gigasampler filter analysis

[Mark K. <mar...@co...>]

On Thu, 2003-10-30 at 08:16, be...@ga... wrote:
> Scrive ian esten <de...@cu...>:
> 
> > the impulse response of a filter completely describes its frequency
> > response... what other information do you need?
> 
> I agree.
> What noise are you refering to ?
> Mark said he recorded the output via digital audio link (Protools)
> and the original sample (non filtered) show all samples zero except one.
> So don't understand where the noise source could lie (except perhaps in
> a wrong GSt setting ?).

Clearly a possibility.

> 
> Steve please show the iFFT of the impulses in a logarithmic scale. (
> at least the y-axis (in dB)
> The graphs you posted are impossible to read.
> Perhaps it looks much better in the log scale ?
> 

I have built the white noise wave file and discussed it with Steve. 

I can now run sox and octave locally, so if there are commands in those
programs people know of to analyze the work I'm doing, please send them
along and I'll do more work up front before spewing out too much stuff.
(I don't have time to try and read octave manuals, nor much interest.)

I am building the gig file based on this today. If I solve my MIDI
problem that cropped up last night I will certainly be able to get some
data of the noise source going through the filters, so we'll have both
versions of filter data to look at.

I would expect that if I made a wrong turn in GSt with the impulses,
then I'll make the same wrong turn using the white noise and we'll see
that, so stay tuned. More data later this evening or tomorrow some time.

- Mark