<html aria-label="message body"><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body style="overflow-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;">That reminds me of an old project I ported to NeXTSTEP back in 1994. It was called rsynth, an early open-source text-to-speech system that converts text to phonemes. It generates speech using a Klatt-style parametric formant synthesizer.<div><br></div><div>So, certainly not a discrete solution, but it was very small and fairly intelligible. Reminded me a bit of the Votrax and TI voices. I wonder if it could run on a modern microcontroller at reasonable speed. My NeXTcube had a 25 MHz 68040, and it wasn’t a real time experience...</div><div><br></div><div>I see it has been updated as recent as 2005 ;-) <a href="https://sourceforge.net/projects/rsynth/">https://sourceforge.net/projects/rsynth/</a></div><div><br></div><div>Ben</div><div><br><div><div><br><blockquote type="cite"><div>On 1 Sep 2026, at 12:18, Tom Wiltshire <tom@electricdruid.net> wrote:</div><br class="Apple-interchange-newline"><div><div>Certainly there's lots of stuff out there on Linear Predictive Coding, the compression method TI used to get (vaguely!) intelligible speech into the tiny amount of ROM they had available. Beyond that, the LPC model could be done with analogue tech - a "source" oscillator representing the vocal cords, a series of formant filters to create the resonances of the throat and mouth, and then perhaps something to create noise and pops for plosives and such. The trouble is getting hold of the required data to *control* such a thing and make it produce something that sounds like talking. That problem would remain even if you did the entire production chain digitally. Or perhaps I'm wrong and there's loads of LPC datasets freely available now?<br><br>Tom<br><br><blockquote type="cite">On 1 Sep 2026, at 10:09, ulfur hansson via Synth-diy <synth-diy@synth-diy.org> wrote:<br><br>hi list!<br><br>does anyone have information how one could possibly build a classic Speak n Spell chip analogue using currently available parts?<br><br>using AI or microcontrollers is not something that gets me going - i'd love to explore vocal synthesis using discrete logic and readily available jellybean parts -well..... perhaps a daisy to run arrays or tables etc... but im keen to see if anyone has legacy schematics or literature on vocal synthesis.<br><br>your thoughts are greatly appreciated!<br><br>best,<br>-ú<br><br>Sent from outer space<br>________________________________________________________<br>This is the Synth-diy mailing list<br>Submit email to: Synth-diy@synth-diy.org<br>View archive at: https://synth-diy.org/pipermail/synth-diy/<br>Check your settings at: https://synth-diy.org/mailman/listinfo/synth-diy<br>Selling or trading? Use marketplace@synth-diy.org<br></blockquote><br><br>________________________________________________________<br>This is the Synth-diy mailing list<br>Submit email to: Synth-diy@synth-diy.org<br>View archive at: https://synth-diy.org/pipermail/synth-diy/<br>Check your settings at: https://synth-diy.org/mailman/listinfo/synth-diy<br>Selling or trading? Use marketplace@synth-diy.org<br><br></div></div></blockquote></div><br></div></div></body></html>