2 modules ideas

[patchell]

    Sounds cool.  I was working a bit at one time to make a voltage controlled
formant filter with 3 filters.  I was trying to use peicewise linear fitting to
generate the functions that would create specific vowels at specific voltages.
This was one of those projects that didn't go too far because it just got too
complicated.  I even thought of maybe using a micro, but decided I did not want
such a function that badly.

    I like your idea of having a record mode.  Makes sort of almost the ultimate
vocoder in some ways.  Good luck and keep us posted.

Fraser, Colin J wrote:

>
>
> -----Original Message-----
> From: jbv
> Sent: Thu 10/08/2000 19:53
> To: Synth-DIY
> Cc:
> Subject: 2 modules ideas
>
> 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.
>
> 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...
>
> I've been thinking about that one for a while.
>
> You could add a bunch of rectifiers and envelope followers on the individual
> filter outputs.
>
> Record the spectral dynamics of one sound, store these digitally in a
> 'spectral sequence' bank, then replay them to vocode another sound.
>
> Perhaps you could even perform FFT analysis of a sampled wave over time then
> have an algorithm to generate the control transients for your formant filter
> bank, with added dynamic reconfiguration of centre frequencies and Qs to
> provide the best quality vocoding.
>
> Spectral resynthesis ?
>
> Probably a lot of work...
>
>
>
> Colin f
>
> (sorry 'bout the html - no choice with outlook web access on exchange 2k)

--
 -Jim
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