[sdiy] Buchla many-sinewave module

[Sean Costello]

OK, this is late, but I was looking up "Buchla" on the list and found this
post.

Anyway, if it hasn't been mentioned yet, it sounds like the Buchla 148
harmonic generator is simply a sine wave generator, and nine balanced
modulators:

harmonic1 = sineGenerator;
harmonic2 = harmonic1*harmonic1;
harmonic3 = harmonic2*harmonic1;
harmonic4 = harmonic2*harmonic2;
harmonic5 = harmonic4*harmonic1; // or harmonic3*harmonic2
harmonic6= harmonic3*harmonic3;

and so on. This is a fairly cheap way to generate harmonics in the digital
domain, although once you add in the weightings and summings, it might be
cheaper to compute Chebyshev coefficients, and use them to generate a
wavetable.

Sean Costello

----- Original Message ----- 
From: "Aaron Lanterman" <lanterma at ece.gatech.edu>
To: "Synth DIY List" <synth-diy at dropmix.xs4all.nl>
Sent: Friday, March 24, 2006 11:26 PM
Subject: [sdiy] Buchla many-sinewave module


>
> On Sat, 25 Mar 2006, Rykhaard D.A.M.I.A.N. wrote:
>
> > I'd love to find something like that as well, as Additive Synthesis
> > IS, one of my big dreams, within my machine. :O  Keeping all of the
> > required oscillators in tune though, could be hellish. :O  (And I have
>
> I think the Buchla 100 series actually had some wild module that did that.
>
> Ah - Buchla 148 harmonic generator. Wouldn't it be fun to see thee
> schematics on that???
>
> http://www.vasulka.org/Kitchen/PDF_Eigenwelt/pdf/096-099.pdf
>
> ------
>
> Model 148 Harmonic Generator
>
> Generates a fundamental and its first nine harmonics (harmonic numbers 1 -
> 10). Fundamental frequency is continuously variable from 5 cps to 5 kc and
> may be controlled internally or with an externally applied voltage. There
> is provision for wide- band frequency modulation. The 148 is frequently
> used in conjunction with mixers (106, 107), gates (110), and attack
> generators (180) to enable precise programmed envelope control of
> individual overtones.
>
> -----
>
> In the words of Neo, "whoa."
>
> - Aaron
>
> --------------------------------------------------------------------------
---
>
> Dr. Aaron Lanterman, Asst. Prof.
> and Demetrius T. Paris Junior Prof.    Voice:  404-385-2548
> School of Electrical and Comp. Eng.    Fax:    404-894-8363
> Georgia Institute of Technology        E-mail: lanterma at ece.gatech.edu
> Mail Code 0250                         Web:
users.ece.gatech.edu/~lanterma
> Atlanta, GA 30332                      Office: Centergy 5212
>