25 Dec
2015
25 Dec
'15
1:38 p.m.
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