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 Forum index » DIY Hardware and Software » Developers' Corner
Compressor/limiter for DIY vocoder?
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electrospeaker



Joined: Jun 30, 2006
Posts: 20

PostPosted: Mon Oct 13, 2014 4:21 pm    Post subject: Compressor/limiter for DIY vocoder?
Subject description: Adding a compressor/limiter circuit to a vocoder's mic inputs
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I'm working on a vocoder (the ETI/Powertran 14-channel vocoder from around 1980/81)
Posted Image, might have been reduced in size. Click Image to view fullscreen.

...and having experienced how easy it was to distory the mic input of a Roland VP-330 vocoder I was wondering if adding a compressor/limiter to the mic-level inputs would be a useful modification?
I need to rebuild the input amps again anyway, so I might as well get them redesigned if that'll be an improvement. Any opinions/comments on tis? Here's the vocoder block diagram and the existing input amplifier circuitry (same circuit for both speech and excitation).
Posted Image, might have been reduced in size. Click Image to view fullscreen.

Posted Image, might have been reduced in size. Click Image to view fullscreen.

NOTE: for some reason the images got resized when uploaded. Hopefully their reduced sizes are still readable. Sorry about that.
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L´Andratté



Joined: Sep 23, 2012
Posts: 60
Location: Hamburg, Germany
Audio files: 5

PostPosted: Wed Oct 15, 2014 2:45 pm    Post subject: Reply with quote  Mark this post and the followings unread

There´s only one way two find out- Wink

http://www.thatcorp.com/datashts/dn107.pdf
http://users.ece.gatech.edu/mleach/papers/limiter.pdf
http://www.forsselltech.com/media/attachments/SideChain_B.PDF

Nice project btw!
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L´Andratté



Joined: Sep 23, 2012
Posts: 60
Location: Hamburg, Germany
Audio files: 5

PostPosted: Wed Oct 15, 2014 2:55 pm    Post subject: Reply with quote  Mark this post and the followings unread

Or the simpler version for not losing focus on vocoding:

http://www.thatcorp.com/datashts/dn125.pdf
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