Envelope followers for vocoder.

[Jezz Brookes]

> Subject:       Re: Envelope followers for vocoder.

>      I'd suggest trying a simple one-diode peak detector, with a resistor 
>      bleeder, followed by a buffer. Although a truly well-designed envelope 
>      follower needs to respond properly over a wide frequency range, you 
>      can probably get away with such a simple solution because you can 
>      tweak the R/C values for each band differently.

I've got a schematic for an envelope follower qround which I'll try to 
scan in some time in the next few weeks.

It's basically a full wave precision rectifier followed by a low pass 
filter, cut off about 40Hz. I've modelled the idea in a program which 
generated vocoder waveforms on a PC and it worked fine.

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     Jezz @ http://homepages.enterprise.net/jezz/    
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