[sdiy] Anyone built the ELEKTOR VOCODER?

[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

>
> Nevertheless, if you look at the central freqs of the 30 bands, and if you
> consider
> the spectrum of human voice (roughly 100 Hz to 2 KHz), there's 14 bands in
> that
> range.
>
> JB
>
>