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Antimon
Joined: Jan 18, 2005 Posts: 4145 Location: Sweden
Audio files: 371
G2 patch files: 100
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mosc
Site Admin
Joined: Jan 31, 2003 Posts: 18197 Location: Durham, NC
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Antimon
Joined: Jan 18, 2005 Posts: 4145 Location: Sweden
Audio files: 371
G2 patch files: 100
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Posted: Wed Jul 12, 2006 2:00 pm Post subject:
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Ah! Thanks. No strings in there yet, but I should be able to find lots of info.
About the noise issue, I realised that I should try a highpass filter and it seems to do the trick. That's something that should come without thinking, isn't it? Stuff you can't hear but the meters are still rising -> DC -> highpass filter. I need to write that on a note on my fridge or something.
/Stefan _________________ Antimon's Window
@soundcloud @Flattr home - you can't explain music |
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Robby
Joined: Feb 08, 2005 Posts: 39 Location: SF, CA, USA
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G2 patch files: 6
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Posted: Mon Jan 15, 2007 9:46 pm Post subject:
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IMO a DC offset indicates a flaw in a physical model.
Physical objects that resonate don't have DC offsets.
For example, a string that is plucked will bounce all the way to the
opposite side it was plucked away from - it doesn't just return to the
center line (0), it keeps bouncing to both sides of the center even
though it was plucked in only one direction.
Think of a pendulum - you pull it to one side only, but it will swing
all the way to the opposite side before coming back. It doesn't just
fall down to dead center then bounce back the way it came.
However, a simple damped delay string model will do exactly that.
Physical systems bipolarize unipolar input.
A DC offset indicates that the physical model doesn't have this property. _________________
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Kassen
Janitor
Joined: Jul 06, 2004 Posts: 7678 Location: The Hague, NL
G2 patch files: 3
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Posted: Mon Jan 15, 2007 10:53 pm Post subject:
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bouncing tennis ball.
:-p _________________ Kassen |
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Robby
Joined: Feb 08, 2005 Posts: 39 Location: SF, CA, USA
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G2 patch files: 6
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Posted: Tue Jan 16, 2007 12:40 am Post subject:
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Does a bouncing tennis ball resonate? _________________
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blue hell
Site Admin
Joined: Apr 03, 2004 Posts: 24079 Location: The Netherlands, Enschede
Audio files: 278
G2 patch files: 320
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Posted: Tue Jan 16, 2007 4:32 am Post subject:
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Yes it does. _________________ Jan
also .. could someone please turn down the thermostat a bit.
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Robby
Joined: Feb 08, 2005 Posts: 39 Location: SF, CA, USA
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G2 patch files: 6
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Posted: Tue Jan 16, 2007 4:05 pm Post subject:
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OK, some resonant physical systems might have DC offsets.
A plucked string definitely woudn't,
neither would the classic mass-spring example.
If you're doing a "tennis ball off the floor" model on the G2,
you might want to consider placing the floor at -1 instead of 0
because you're already losing 8 bits of resolution when
you go through the delay memory and losing the sign bit also
is going to take you down to 15 bits. _________________
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blue hell
Site Admin
Joined: Apr 03, 2004 Posts: 24079 Location: The Netherlands, Enschede
Audio files: 278
G2 patch files: 320
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Posted: Tue Jan 16, 2007 4:23 pm Post subject:
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I'm not to sure about the details, but I remember a remark made by Chet Singer regarding his woodwind simulations. The way he modelled the air stream seemed to bring a DC offset with it as well, intinsically. Anyway, if that memory is correct it should be somewhere in Chet's tutorials (linked above by mosc).
You're right of course that a DC offset in the audio circuits of a patch could very well mean trouble _________________ Jan
also .. could someone please turn down the thermostat a bit.
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