This one was spotted on Muff's from JanneI and sent in via M Me.
Jurgen Haible started work on the design back in 2009, prototype boards came in 2010, and he unfortunately passed away in 2011. His site is gone, however I was able to find his page on the Living Vocoder at the Internet Archive's Wayback Machine here."The Filterbank funktion will have 3 modes:
1) On
The Filterbank will always be mixed with the vocoded sound, acording to how you set the Filterbank sliders.
2) Off
Basic Vocoder function
3) Silence Bridging
The Filterbank function will fade in when there is no speech. So there is always a coloured Excitation signal. While you speak, the colour is set by the speech. When you don't speak, the colour is set by the 20 Filterbank sliders. This allows a seamless blend of ariticulated and non-articulated sound.
You can set the threshold - how many dBs down the speech signal is, before the filterbank is engaged -, and the attack and release time of the filterbank fade in/out, with 3 potentiometers.
Capacitors
I have reduced the expensive, 1% capacitors to two values: 10nF and 47nF.
That way, you can buy them in larger quanities and they won't be that expensive.
You will need about 150 pieces of 47nF 1% and 150 pieces of 10nF 1%.
They are available at www.rs-components.de , order number 169-326 and 166-6421 (These are bags of 10 pieces.)
You'll need a lot of other capacitors as well, of course, butthese can be 5% tolerance - not so hard to source."
You can find additional details and links to schematics here.
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