2 modules ideas

[Paul Maddox]

JBV,

> 
> 1) "additive" synthesis
> 
> the square output of a VCO is fed into a logic divider
> (CMOS or TTL) with at least the following outputs :
> F/2, F/4, F/8, F/16, all squares and in sync.
> Each of these SQ outputs is sent to a Square-to-sine
> converter, which should give synched and octave
> tuned sines.
> Then, each sine is followed by a VCA (the hex-VCA
> recently discussed here could be a cheap solution).
> 
> The idea is to use various CVs to drive the VCAs
> and perform some sort of additive synthesis (or
> at least play with harmonics)...
> 

Look at Walsh function synthesis... very very similar concept..

> 
> 2) formant synthesis
> 
> the CEM3350 is a double VC BP filter with
> VC bandwidth and VC resonnance...
> 
> The idea is to put several of those in parallel
> and perform some formant synthesis by
> controlling all CVs from a uC.
> 

ooo, nice...

> AFAIK, 7 to 8 formants are sufficiant for
> acceptable speech synthesis. Therefore, putting
> 4 CEM3350 in parallel could allow some
> speech / singing synthesis with white noise
> or any VCO output...
> 

could we bypass the use of CEMs?
Id buy/build one of these most deffinatly.

Paul Maddox