[sdiy] Analog Modeling, with a computer!

[Sean Costello]

Roland seems like they have a good spring reverb model in their RV-5. I did a spring reverb emulation last summer at a Banff workshop, using a few hundred cascaded first-order allpass stages to simulate the dispersion of the spring. It sounded great, and only took up 70% of a 2.66 GHz Pentium 4! OK, it was not programmed optimally, but even so, using 200+ allpasses is not very efficient.

Check the press releases at the upcoming AES conference for some spring emulation news (I think - it is not my company that is working on the emulation, so I don't know when they will make the announcement). 

As far as the "boing" when you kick it, you would probably want an accelerometer in your box with the computer/DSP, and use that to generate a rounded impulse that gets fed into the reverb input. I don't think this will make it into the above product, but it has been discussed.

Sean Costello
  ----- Original Message ----- 
  From: megaohm 
  Cc: synth-diy 
  Sent: Wednesday, September 14, 2005 1:34 PM
  Subject: Re: [sdiy] Analog Modeling, with a computer!


  Just curious. Has anyone modelled a reverb tank? I want to be able to get that boooiiinnngg sound everytime  I kick my computer. Perhaps in the future we could model the actual flow of electrons instead of mere components. 

  peng

   
  On 9/14/05, Antti Huovilainen <ajhuovil at cc.hut.fi> wrote: 
    On Wed, 14 Sep 2005, Richard Wentk wrote:

    > This *will* affect the sound, often noticeably. So the only way to really 
    > model a physical circuit is to replace all the ideal components with nominal
    > R+L+C+noise network models, and then add some extra mostly-C, some R and

    I often hear statements like this, but I've yet to see any of them backed 
    up by hard data (such as a listing with values for a typical poly*
    capacitor at audio frequencies). So excuse me, if I remain skeptical.

    Antti

    "No boom today. Boom tomorrow. There's always a boom tomorrow" 
      -- Lt. Cmdr. Ivanova


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