electro-music.com   Dedicated to experimental electro-acoustic
and electronic music
 
    Front Page  |  Articles  |  Radio
 |  Media  |  Forum  |  Wiki  |  Links  |  Store
Forum with support of Syndicator RSS
 FAQFAQ   CalendarCalendar   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups   LinksLinks
 RegisterRegister   ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in  Chat RoomChat Room 
 Forum index » Clavia Nord Modular » G2 Building Blocks
Brickwall sampling filter creating manyLoFi aliasing effects
Post new topic   Reply to topic Moderators: Nord Modular Editors
Page 1 of 1 [3 Posts]
View unread posts
View new posts in the last week
Mark the topic unread :: View previous topic :: View next topic
Author Message
Rob



Joined: Mar 29, 2004
Posts: 578
Location: The Hague/Netherlands/EC
G2 patch files: 109

PostPosted: Mon May 15, 2006 9:05 am    Post subject: Brickwall sampling filter creating manyLoFi aliasing effects Reply with quote  Mark this post and the followings unread

The idea for this one is cooked up by Kassen and me. The idea is to use two S&H modules and use alternate clocking combined with crossfading between the two. The alternating clocks are derived from the crossfader control waveform, one S&H clocks on the positive peak maximum, while the other clocks on the negative peak minimum.

As crossfader waveform either a triangle or a sinewave can be used. Some waveshapes from the Shape oscillators are also quite interesting.

By definition no frequency higher as the clockfrequency can be passed, but this perfection is neatly compensated by an interesting sonic scala of aliasing artifacts beyond the 'cutoff' frequency.

Kassen discovered how to make this circuit resonate. This resonance is interesting as it actually superimposes the crossfader control waveform on the output signal.

Right now two main artifacts are added to the filtered signal, aliasing that depends on the frequency ratio of the input signal and the clocking signal, plus aliasing caused by the synchronization of the S&H's to the system sample rate. The first type of aliasing can be considered to be wanted, to create all sorts of effects that are easily associated with a LoFi digital sonic character. There is lot of control on how this aliasing sounds.
The jitter caused by the interaction between the system sample rate and the clocking sample rate is less wanted, as it sort of causes sharp transients in the input waveform to be jittered. I suppose a samplerate of 4MHz should solve that sufficiently, but that needs to wait a couple of years. Wink


FltBrick.pch2
 Description:
A curiously sounding resonant filter with lot's of LoFi aliasing sound control. Basically it is close to the ideal digitizer module.

Download
 Filename:  FltBrick.pch2
 Filesize:  3.08 KB
 Downloaded:  852 Time(s)

Back to top
View user's profile Send private message Send e-mail Visit poster's website
Blue Hell
Site Admin


Joined: Apr 03, 2004
Posts: 20559
Location: The Netherlands, Enschede
Audio files: 147
G2 patch files: 318

PostPosted: Mon May 15, 2006 12:31 pm    Post subject: Reply with quote  Mark this post and the followings unread

Fun patch to experiment with !
_________________
Jan
Back to top
View user's profile Send private message Visit poster's website
Fozzie



Joined: Jun 04, 2004
Posts: 875
Location: Near Wageningen, the Netherlands
Audio files: 8
G2 patch files: 49

PostPosted: Mon May 15, 2006 12:52 pm    Post subject: Reply with quote  Mark this post and the followings unread

And good to see you active on the forum again, as well. It appears you're back from a sort of break too much coffee
Back to top
View user's profile Send private message
Display posts from previous:   
Post new topic   Reply to topic Moderators: Nord Modular Editors
Page 1 of 1 [3 Posts]
View unread posts
View new posts in the last week
Mark the topic unread :: View previous topic :: View next topic
 Forum index » Clavia Nord Modular » G2 Building Blocks
Jump to:  

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum
e-m mkii

Please support our site. If you click through and buy from
our affiliate partners, we earn a small commission.


Forum with support of Syndicator RSS
Powered by phpBB © 2001, 2005 phpBB Group
Copyright © 2003 through 2009 by electro-music.com - Conditions Of Use