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 Forum index » Clavia Nord Modular » Nord Modular G2 Discussion
Some facts about the vocoder
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Falk



Joined: Mar 07, 2006
Posts: 75
Location: Sweden
G2 patch files: 29

PostPosted: Tue Feb 19, 2008 12:38 pm    Post subject: Some facts about the vocoder Reply with quote  Mark this post and the followings unread

Hi.

I got sidetracked while looking at the Vocopad (factory) patch by Zon Vern Pyles and now I might as well post what I found out.

Vocoder frequency bands.
Band Low High Middle freq
1: <7.943Hz 206.90Hz
2: 204.58Hz 326.37Hz 258.4Hz ~ C4
3: 324.90Hz 461.77Hz 387.3Hz ~ G4
4: 460.52Hz 607.82Hz 529.1Hz ~ C5
5: 606.73Hz 777.65Hz 686.9Hz ~ F5
6: 776.25Hz 973.61Hz 869.3Hz ~ A5
7: 971.85Hz 1.200kHz 1.08kHz ~ C6
8: 1.198kHz 1.463kHz 1.32kHz ~ E6
9: 1.461kHz 1.777kHz 1.61kHz ~ G6
10: 1.775kHz 2.151kHz 1.95kHz ~ B6
11: 2.149coz 2.600kHz 2.36ckH ~ D7
12: 2.598kHz 3.157kHz 2.86kHz ~ F7
13: 3.154kHz 3.882kHz 3.50kHz ~ A7
14: 3.880kHz 4.885kHz 4.35kHz ~ C#8/Db8
15: 4.889kHz 6.415kHz 5.60kHz ~ ??
16: 6.470kHz 7.459kHz 6.95kHz ~ ??

Low and high was measured by the supplied patch. Middle frequency was calculated by exp( (log(low) + log(high)) / 2 ) and note values ripped off some page found by google (and I was to lazy to find the 2 highest values).

Time for envelope follower seems to be 5 ms attack and 65 ms release for all bands.

The emphasis button is supposed to (according to the manual) 'emphasize the high frequencies of the analysis signal' and it does something but I am not sure of what. I'll leave that for another post....

The supplied image shows a frequency plot from CoolEdit.


Regards
Falk


VocoderBands.PNG
 Description:
Picture of the bands frequencies.
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VocoderBands.PNG



VocoderFAQ.pch2
 Description:
Patch for measuring the frequency bands of the vocoder

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 Filename:  VocoderFAQ.pch2
 Filesize:  1.18 KB
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Falk



Joined: Mar 07, 2006
Posts: 75
Location: Sweden
G2 patch files: 29

PostPosted: Wed Feb 20, 2008 9:51 am    Post subject: Emphasis button Reply with quote  Mark this post and the followings unread

Hi again.

I think I have managed to illustrate what the emphasis button does.

The patch works with band 1, 11 and 15. 2 vocoders for stereo and only one has Emp-button engaged.

Noise is sent through to be modulated and a frequency plot shows that band 1 has the same amplitude in both left and right channel. With Emp engaged it seems the 'synthesizer input' (noise in this case) bleeds through even when there is no corresponding signal in the control/modulation input band. There is also an increase of the amplitude in the higher bands for the Emp:ed vocoder.

If you cross over the 11 and 15 bands on both vocoders and frequency plot that you see that you get more amplification in band 11 (because it is fed the signal from band 15).

Hope at least something of this makes any sense what so ever Very Happy

Regards
Falk


VocoderEmp.PNG
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Picture showing emphasis at work in a frequency plot
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VocoderEmp.PNG



VocoderEmpCrossedBands.PNG
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Picture showing the effect of crossing band 11 and 15
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VocoderEmpCrossedBands.PNG



VocoderEmpTest.pch2
 Description:
A test patch to explore theemphasis button on the vocoder module

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 Filename:  VocoderEmpTest.pch2
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Blue Hell
Site Admin


Joined: Apr 03, 2004
Posts: 23395
Location: The Netherlands, Enschede
Audio files: 261
G2 patch files: 320

PostPosted: Wed Feb 20, 2008 10:08 am    Post subject: Re: Emphasis button Reply with quote  Mark this post and the followings unread

Falk wrote:
Hope at least something of this makes any sense what so ever Very Happy


Some of it .. yes ... but you are the expert now Laughing

It's interesting!

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