additive

[McIntosh, Malcolm]

Hi,

This is a subject I have been thinking about with no idea how to
implement.

Would it be possible to use frequency multiplication and one really good
sine wave VCO for limited additive synthesis?  Would it be necessary to
have 64 or 128 harmonics if you just wanted to make some really nice
sounds but not be totally imitative?  Could you get away with 16 or
maybe 8 (!) harmonics to make really interesting non-imitative sounds?

Forgive anything I have over looked.

Malcolm

P.S This is the 2'nd time I sent this because the first time it didn't
seem to show up.

> -----Original Message-----
> From:	Haible Juergen [SMTP:Juergen.Haible at nbgm.siemens.de]
> Sent:	Thursday, August 13, 1998 3:32 AM
> To:	DIY
> Subject:	AW: additive
> 
> If you want to make analogue additive synthesis (rather)
> simple, you might try this:
> 
> Start with a triangle VCO, and derive as many triangle
> "harmonics" as possible with waveshaping.
> Then use 3080's or similar OTAs for creating sine waves
> from the triangles. Use the control input of the same OTAs
> to get the VCA function. Connect all OTA outputs directly
> together.
> Try simple Envelopes. A 1ms-attack / variable decay
> might be enough for higher harmonics, if you have a master
> VCA at the end with a standard envelope.
> 
> Just an idea - haven't tried it.
> 
> JH.