[LAU] Galvanic isolation (was: Re: pianos with built in recorders?)

[Jonathan E. Brickman]

> USB MIDI has got the risk to cause noticeable MIDI jitter.
>
> Does USB MIDI provide galvanic isolation? Several times I read claims
> that USB MIDI connections aren't galvanically isolated.
>
> Standard MIDI connectors make usage of opto-couplers and shield of the
> MIDI DIN connectors is open.
Certainly all of the USB MIDI connections I have ever tested, are not 
galvanically isolated; I always get trouble with USB signals bleeding 
over where they don't belong.  USB-to-DIN adapters I have used have been 
better, but not perfect.  Is there a make/model of USB-to-DIN (or even 
PCI-to-DIN if it exists anymore) which you know for sure has 
opto-coupling?  That would be a great boon to me. Sooner or later I'm 
going to do optocoupling for audio too, probably using a TOSLink setup.

J.E.B.

-- 
Jonathan E. Brickman   jeb at ponderworthy.com   (785)233-9977
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