[sdiy] Patchable polyphonic synth with FM or AM transmission idea

cheater00 cheater00 cheater00 at gmail.com
Fri Dec 28 23:10:11 CET 2018


I don't know Roman, I can receive more than 16 FM stations over the
air and they're all pretty listenable and have more than 3.4 kHz
bandwidth.

On Thu, Dec 27, 2018 at 2:55 PM Roman Sowa <modular at go2.pl> wrote:
>
> Frequency domain multiplexing was used long time ago in telephony.
> How nice and easy solution this was can be simply put in two questions:
> - why nobody remembers that?
> - why it was abandonned so quickly?
>
> I mean you have ready to use multichannel digital standards and
> multichannel ADc and DACs, why bother using an ancient idea that was so
> troublesome to manage that even 0.3-3.4kHz bandwith audio was a challenge.
> And if you want full analog, I'd go with multipin connectors, there are
> lots to choose from. OK expensive patch cable then, but still a tiny
> fraction of the price of any 16-voice module.
>
> Polysynths are hardwired for a reason.
>
> Roman
>
> W dniu 2018-12-25 o 20:49, cheater00 cheater00 pisze:
> > Hi everyone,
> > I was thinking again about how you could do a modular polysynth well,
> > and it occurred to me that you might be able to use frequency domain
> > multiplexing (FDM) to put several signals over a single conductor
> > pair. A quick search found the Si4710 which is a bit pricey at ~$12 on
> > digikey but it's a tiny 3x3mm QFN device that performs complete FM
> > transmission. In a 16 voice system, at about 5 output functions per
> > module, and 12 modules, you can easily use up ~1000 of those, which
> > drops the price to $4. I was wondering what everyone thinks about this
> > sort of scheme.
> >
> > Given that metal patch cables could function as antennas and cause
> > both cross talk and external signal pick up, one could also use
> > multimode glass fiber and transmit signals this way. The question is,
> > does anyone know whether support electronics could be found that are
> > integrated enough (small in footprint) and inexpensive? The idea would
> > be to build an electronics module that takes 16 analog audio channels
> > and outputs a signal that can be then converted to glass media
> > signalling.
> >
> > Merry Christmas everyone!
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> >



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