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

rsdio at audiobanshee.com rsdio at audiobanshee.com
Sat Dec 29 03:05:56 CET 2018

Fiber-optic cable will attenuate signals significantly in proportion to bending of the cable, among other causes. That’s why digital signals are used, since an attenuated “1" is still distinct from a “0.” This sort of thing doesn’t happen with copper cables.

I doubt that you could get analog signals to work properly over fiber without using frequency modulation to remove the amplitude sensitivity.

On Dec 28, 2018, at 5:51 PM, Ben Lincoln <blincoln at eventualdecline.com> wrote:
> You could, but is there any hardware that does that, or would it involve designing and building custom fiber-optic communication circuitry? 
> Even if one did that, it seems like it would still involve appreciable losses bouncing between electrical analogue and optical analogue at every patch point, but that's not my area of expertise, so I could be wrong. 
> On 28 December 2018 17:16:33 GMT-08:00, Joel B <onephatcat at earthlink.net> wrote:
>> Not sure why you couldn’t send analog signals via fiber - probably use the wave angle to multiplex over the same cable just like networking signals do, and convert the amplitude or frequency back to an electrical signal.
>> Joel
>> Sent from my iPhone 
>> On Dec 28, 2018, at 4:46 PM, Ben Lincoln <blincoln at eventualdecline.com> wrote:
>>> Your original post included a suggestion of using fiber-optic connections, which - unless I'm greatly mistaken - inherently means converting between analogue and digital at every patch point.
>>> Maybe it would make more sense, and maybe you'd get answers you were happier with, if you explicitly stated what you were hoping to end up with. A working analogue modular polysynth that you built yourself? A design to have someone else build? A theoretical design that you want to patent and hope to license? Etc. 
>>> On 28 December 2018 14:17:59 GMT-08:00, cheater00 wrote:
>>>> In case someone wants to mention some other more or less obscure type
>>>> of cable, PLEASE DON'T, I really considered them all.

I’ve you’re already considered all of the options, why are you asking questions? It’s not very convincing when you claim to know everything about an aspect of the problem, but still need help.

>>>> Can we please have the thread return to the original question, which is below:
>>>> Can we please NOT talk about whether this is feasible, provide good
>>>> results, or be cheap. Can we please not talk about crossbar ICs,
>>>> digital transmission, or multi-conductor cables. If you want, you can
>>>> start your own thread, thanks. We've had those exact conversations on
>>>> this mailing list a dozen times over the last 20 years at least,
>>>> please look in the archives. There's absolutely nothing new to be said
>>>> here.
>>>>  W dniu 2018-12-25 o 20:49, cheater00 pisze:
>>>>> 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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