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 Forum index » Clavia Nord Modular » G2 Building Blocks
Spectrum tool & DIY fixed filterbank (well, kind of)
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selvmarcus



Joined: Feb 08, 2006
Posts: 121
Location: Berlin, Germany
G2 patch files: 39

PostPosted: Sat Mar 18, 2006 8:22 am    Post subject: Spectrum tool & DIY fixed filterbank (well, kind of) Reply with quote  Mark this post and the followings unread

The spectrum analyzer will give you a rough idea what the frequency contents of signal is.

It is sweeping a frequency range from about 50 Hz to about 16 or so kHz, rather slowly, measures the level there
and records it as a step into a note sequencer.

The white noise mod turned out be coulored, so I mixed some RndClock in to give it a more balanced frequency contents.

There is also an 8 sample delay with a mixing apparatus to give an universal 8-tap filterbank (feedback for resonance included).

The samplerate is reduced to 48 kHz here, btw.

By feeding the noise (or a sweeping sine, see demo) into this, you can have a look at the resulting spectrum.

Well, it´s not a real replacement for some nice present from
clavia, and also quite DSP-expensive, but may be
you can bridge some time with it until that happy day... Smile


Have fun,

-----
Marcus


SpectrumFilterSM.pch2
 Description:
Scpectrum analyzer tool and universal 8-tap fixed filterbank

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 Filename:  SpectrumFilterSM.pch2
 Filesize:  3.46 KB
 Downloaded:  915 Time(s)

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Blue Hell
Site Admin


Joined: Apr 03, 2004
Posts: 22943
Location: The Netherlands, Enschede
Audio files: 242
G2 patch files: 319

PostPosted: Sat Mar 18, 2006 8:44 am    Post subject: Reply with quote  Mark this post and the followings unread

Cool !

So now we'll just have to wait for the 128 step sequencer module :)

_________________
Jan
also .. could someone please turn down the thermostat a bit.
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selvmarcus



Joined: Feb 08, 2006
Posts: 121
Location: Berlin, Germany
G2 patch files: 39

PostPosted: Sat Mar 18, 2006 7:43 pm    Post subject: Reply with quote  Mark this post and the followings unread

May be not? Smile

-----
Marcus


SpectrumFilt32SM.pch2
 Description:
Spectrum analyzer tool with 32 bands and universal 8-tap fixed filterbank

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 Filename:  SpectrumFilt32SM.pch2
 Filesize:  3.91 KB
 Downloaded:  893 Time(s)

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Blue Hell
Site Admin


Joined: Apr 03, 2004
Posts: 22943
Location: The Netherlands, Enschede
Audio files: 242
G2 patch files: 319

PostPosted: Sat Mar 18, 2006 9:08 pm    Post subject: Reply with quote  Mark this post and the followings unread

You make me doubr now ... you may be faster :-)
_________________
Jan
also .. could someone please turn down the thermostat a bit.
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selvmarcus



Joined: Feb 08, 2006
Posts: 121
Location: Berlin, Germany
G2 patch files: 39

PostPosted: Sun Mar 19, 2006 9:55 am    Post subject: Reply with quote  Mark this post and the followings unread

I stretched the Y-Resolution also with a second row of sequencers.
Seems to be more usable for the intended purpose, now.

Sweeping the fixed-filterbank with a sine works better than
feeding with white noise, the levels for each band are more stable than.

I turned down the sweeping speed though, because of better
resolution in the low frequencies. Tradeoff.

Do you know how to track the NordFilter freq mod with an osc exactly?
The pitch inputs are not compatible for some reason.
Also with FM input I had no luck.

For sweeping I use a ClassicFilter in selv-oscillation by now (more even
than the NF), but the very low and higher freq are down in level there,
too. Tried to extend the range with some eq-ing.

Or may be using some diy filter / sine-osc ?

Do you know something?

-------
Marcus


SpectrumF32expSM.pch2
 Description:
Spectrum analyzer tool with 32 bands (expanded level resolution) and universal 8-tap fixed filterbank

Download
 Filename:  SpectrumF32expSM.pch2
 Filesize:  4.84 KB
 Downloaded:  969 Time(s)

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