Vocoder design

[mark verbos]

the detector should compare the highest band to the lowest band. I forget which one needs to be higher for the noise to kick in though.

mark

jorgen.bergfors at idg.se wrote:

> Hi Scott, thanks for the formulas. I'll try to enter them in Excel.
> Last night I did some PCB layout. It seems quite possible to fit eight channels on one 100x160 mm board. That would make it 2 1/2 boards for the entire vocoder.
> One thing missing in the vocoder is a voiced/unvoiced detector. Any of you gurus have any idea how one would work?
> I would imagine that the circuit would crossfade in a certain amount of noise, when the detector exceeds a certain threshold.
> The noise would go through the filter bank too, of course. You could also patch another signal instead of the white noise, if you wanted.
> I think a circuit like this would add really interesting possibilities. The question is how the detector would operate.
> How could you determine if the signal is pitched or unpitced? Maybe it could be considered unpitched if several adjacent bands are "on"? But I doubt that it would work in all situations.
> Let's hear some better ideas!
>
> /Jorgen

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mark verbos

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