[sdiy] Formant filters, yay!

Quincas Moreira quincas at gmail.com
Mon Mar 13 18:18:25 CET 2017

This filter and the Vowel patch shown may be relevant to this convo :)


On Sat, Mar 11, 2017 at 8:05 PM, <rsdio at audiobanshee.com> wrote:

> On Mar 11, 2017, at 1:23 AM, Tony K <weplar at gmail.com> wrote:
> > All this talk of vocal filters made me nostalgic for S.A.M. in the Apple
> ][+ playing through a 1408 DAC board.
> > I don't have have Chamberlain's MAM anymore but I believe there was  a
> good coverage of the topic in there . I seem to recall VOSIM software.
> > Would have loved to know who wrote that original Apple program.
> > The later Atari version of SAM was also good but never quite sounded as
> impressive or 'demented' as the Apple version. Used that as my first drum
> machine in phoneme mode.
> >
> > Sorry if this is completely irrelevant.
> It seems quite relevant for DIY Synthesis - at least it was for my
> experience. It even seems relevant, still, in terms of today's embedded
> audio synthesis platforms.
> The Apple ][+ community seemed to be 99% piracy. People had no qualms
> about photocopying the manual and duplicating the disks. I never actually
> did this for myself, because I never actually saw any original software
> packages, and yet people often volunteered to give me copies when I was
> young. The strangest was when someone copied the S.A.M. manual and disk for
> me, because I realized that the software was useless without the hardware.
> Fortunately, the last few pages of the S.A.M. (Software Automatic Mouth)
> software has the schematic for their hardware. I hand-etched a double-sided
> Apple ][ peripheral card with the DAC and op-amps and managed to get the
> thing working!
> The S.A.M. vocal synthesis was reasonably interesting, but I quickly found
> that I preferred writing non-vocal audio synthesis algorithms for myself. I
> ended up with a linear FM program that was quite impressive (but only one
> voice of two operators). The analog output was a couple of watts, so it
> could directly drive a large speaker without an amp.
> I would also like to know who wrote the original Apple S.A.M. software.
> Perhaps I can find the ancient photocopy of the manual and look for the
> author's name, if it's even mentioned in addition to the software company
> name.
> You are correct that Chamberlain's "Musical Applications of
> Microprocessors" includes a chapter that covers VOSIM. It's Chapter 13,
> Digital Tone Generation Techniques, in the final section for "other," and
> it literally stands for VOcal SIMulation. I never realized that VOSIM is
> related to FM - not in exact technique so much as similar processing
> complexity.
> Later voice simulators seemed to be based on dedicated chips where there
> was no direct access to the DAC. By being exposed to S.A.M. and building
> the DAC board, I was able to learn a lot more about digital audio synthesis
> on my own (I didn't read MAM until decades later). Of course, several years
> later computers like the Amiga had 8-bit DAC features built in, and the
> Apple //gs actually included the Ensoniq ESP chip, but by that time I had
> moved on.
> Brian Willoughby
> Sound Consulting
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Quincas Moreira
Test Pilot at VBrazil Modular
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