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

Le jeudi 24 décembre 2015, 11:48:07 Bob van der Poel a écrit :
> I believe that the MIDI spec
>
> http://www.midi.org/techspecs/electrispec.php
>
> says that you must have a opto-isolator. Devices without one are probably
> not compliment ... don't know about direct usb connections.
>

MIDI uses an unipolar signaling which is very sensitive to electromagnetic
noises, in particular those ground loop generates. That's why MIDI standard
requires an opto-coupler.

USB uses a differential signaling and can works without any galvanic isolation.

-- 
Yves Guillemot
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