[sdiy] Anyone built the ELEKTOR VOCODER?

[jbv]

Theo  :

> Hi JB,
>
> a small remark, but I think you are already aware of this.
>
> 100 Hz to 2kHz is roughly the tone range of the "singing" voice.
> The range of the harmonics that are important to recognize (understand)
> speech is much larger.
> Although from 8kHz up or so a shelving filter may do.
> With out the harmonics between roughly 2kHz up it becomes hard to understand
> speech.
> While with out the harmonics below 2kHz the voice sounds funny, but is
> perfectly understandable.
>
> Just my 2cnts,
> Theo
>

Yes, you're right. The Elektor vocoder for instance features 8 bands
from 260 to 3900 Hz.
In my project, there are 17 bands in the 100 / 4000 Hz range, which is
even better.
Freqs above that will be handled by the white noise generator & the
voice/devoice detector.

JB