I'm considering creating a PCB (or two) that would have all the
additional circuitry needed to make a "modular vocoder". You'd need
two of the JH string filters to make this work (and a few patch cords
to hook it all up). You could build a standalone vocoder and eliminate
all the patching, but then you wouldn't be able to use the JH string
filter "as is". I'd like to at least try it. I designed a vocoder back
in the mid 1980s but never got it completed. The JH string filter
already has the necessary mixer and the filters have 10-turn trimmers
for calibration, that got me thinking it wouldn't be all that much
extra work to make a vocoder.
Here are some other uses for the string filter separate outputs:
1. extracting vocal formants
2. spectral processing of individual bands
3. using specific bands to trigger envelope generators
On 27-Jul-08, at 9:00 PM, John Mahoney wrote:
> At 07:27 PM 7/27/2008, Scott Juskiw wrote:
>> 40 band vocoding.
>
> You must be kidding! Are you kidding? :-)
>
> 40-band vocoding requires two 40-band filters, 40 envelope followers,
> 40 VCAs, a high-pass filter (for sibilants) and a 42-input mixer
> (input signal + sibilants + all 40 encoded bands). (And, it should
> all be calibrated. Why have 40 bands without precision?)
>
> John
>
>
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