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 Forum index » DIY Hardware and Software
A different approach to adding velocity to ADSR
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Ricko



Joined: Dec 25, 2007
Posts: 154
Location: Sydney, Australia
Audio files: 3

PostPosted: Sun Feb 20, 2011 6:45 am    Post subject: A different approach to adding velocity to ADSR Reply with quote  Mark this post and the followings unread

I was reading this conference paper:

"Expressive Articulation for Synthetic Music Performances"
by Tilo Haehnel and Axel Berndt:
http://www.educ.dab.uts.edu.au/nime/PROCEEDINGS/papers/Paper%20P1-P5/P277_Haehnel.pdf

They look at Leopold Mozart's book on early classical/baroque articulations, and do some measurements of instruments. So I thought I'd have a stab at a circuit in SPICE. Here is it, in case anyone is interested.

Basically, we run the ADSR through a multiplier and then into the same kind of sine shaper diode circuit that VCOs use. The result is that at low velocity, a linear ADSR input comes out err linear. But at higher velocity, the input is bent into a curved shape, filling out the note without altering the timing.

Anyway, attached is the circuit, a sound simulation (synthedit), and an eg waveshape.


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emdot_ambient



Joined: Nov 22, 2009
Posts: 669
Location: Frederick, MD

PostPosted: Mon Feb 21, 2011 3:48 pm    Post subject: Reply with quote  Mark this post and the followings unread

It's a really simple circuit...would be interesting to hear it built and tested on a synth voice articulating it with something other than veolcity (like a sequencer output).
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