[sdiy] Vocoder

[Magnus Danielson]

From: patchell <patchell at silcom.com>
Subject: [sdiy] Vocoder
Date: Sat, 26 Apr 2003 19:42:55 -0700

>     I was going to get my new oscilators running today, but, after
> reading about vocoders in EN last night, I got a bug up my....@$$...and
> just had to get the vododer I built back around 1979-80 working again.
> I also decided to modify the filter banks a bit as there were a few good
> hints on what they should look like...minor really, but it ended up
> taking all day (rather than the 1 hour I figured on).

Please don't remind me! I have a stupid problem with mine, and I just can't take the
time and effort to deal with it _properly_. It's an input amplifier (of all the things
that could go wrong) that keeps messing with me. Two phreaking op-amps and some
passives... and I seem unable to get it right.

>     Anyway, here is where you can see a pic of the vocoder:
> 
> http://www.silcom.com/~patchell/pictures/pictures.html

20 channels in your vocoder. MMmm... ;O)

>     And here is a sample:
> 
> http://www.silcom.com/~patchell/pictures/vocoder.mp3

It took me several listenings (hey - I was listening to someones MP3, feel lucky!)
and *think* I could interprent "This is a recording, testing 1 2 3 4 5 6 7 8 9 10"
correct?

The ringing degrades the speech properties, so you might consider backing off some.
However, this may not necessary have to be a bad effect in itself, as long as you can
back off for better speach when you need it.

>     It sounds a lot better now that I modded the filters.  Mostly, just
> increased the Q and also the gain of the filter blocks.  It seems to be
> fairly clear...or, at least, I can understand what I am saying (even
> without a vocoder, most people don't seem to understand what I say ;^P )

Say what??? Could you please repeat that? It seems like the Jello has sucked in the
cranbarriesause now and gewied into your keyboard really tight now...

Cheers,
Magnus - with no sign of either Jello or any form of cranberrys on my birthday...