[sdiy] SpeakJet Module possibilities

[Grant Richter]

The current Speakjet is a fine product for speech synthesis. The current
version is based on a PWM modulated carrier of 8 kHz. So your max bandwidth
is 4 kHz. The manufacturer has stated the Speakjet 2 will have a more
"normal" synthesizer architecture (like ADSR) and higher bandwidth.

So we are waiting for the second version of the chip before doing module
design. Using a microprocessor with A/D inputs to convert voltages to
controls strings allows a kind of babble box which is fun.

From: "J. Larry Hendry" <jlarryh at iquest.net>
Date: Wed, 4 Aug 2004 12:05:14 -0500
To: <Robotboy8 at aol.com>
Cc: "synth DIY" <synth-diy at dropmix.xs4all.nl>
Subject: Re: [sdiy] SpeakJet Module possibilities


This has already been done.  Brice Hornback had one in his PSIM-1 module at
AHMW 2004 this past spring.  It was set up doing a random babble that was
very vowel like.  If I am not mistaken, you must drive it serially.  Direct
voltage control is not possible.  It sure works well with the PSIM-1 (which
gives you 4 programmable input voltages).
 
Brice can be found at:
bdh at cyberbound.net
 
His website with some speakjet info is at:
http://www.synthmodules.com/
 
Larry H
----- Original Message -----
From: Robotboy8 at aol.com
To: synth-diy at dropmix.xs4all.nl
Sent: Wednesday, August 04, 2004 10:54 AM
Subject: [sdiy] SpeakJet Module possibilities

Has there been any serious thought into using a SpeakJet in module?  Someone
seems to mention them on this list every couple of weeks, but nobody seems
to have taken the idea anywhere.  I've looked at the manual and it seems
like you could pretty much use the thing as a VCO with vowel sounds instead
of waveforms, but I'm not too sure about that (I also don't know if it'd be
linear or expo, though since I have no other modular equipment that isn't so
big of a deal for me as many others on this list).

      -eric 



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