kaini Posted January 25, 2009 Share Posted January 25, 2009 The physical MIDI interface uses DIN 5/180° connectors. Opto-isolating* connections are used, to prevent ground loops occurring among connected MIDI devices. Logically, MIDI is based on a ring network topology, with a transceiver inside each device. The transceivers physically and logically separate the input and output lines, meaning that MIDI messages received by a device in the network not intended for that device will be re-transmitted on the output line (MIDI-OUT). This introduces a delay, one that is long enough to become audible on larger MIDI rings.... *In electronics, an opto-isolator (or optical isolator, optocoupler, photocoupler, or photoMOS) is a device that uses a short optical transmission path to transfer a signal between elements of a circuit, typically a transmitter and a receiver, while keeping them electrically isolated — since the signal goes from an electrical signal to an optical signal back to an electrical signal, electrical contact along the path is broken. Link to comment Share on other sites More sharing options...
BCM Posted January 25, 2009 Share Posted January 25, 2009 jesus christ, what the fuck have you been smoking? Link to comment Share on other sites More sharing options...
Berk Posted January 25, 2009 Share Posted January 25, 2009 Didn't understand a single word of it Link to comment Share on other sites More sharing options...
Guest greenbank Posted January 25, 2009 Share Posted January 25, 2009 when i read the thread title i wtflol'd but actually yes i think they do. it's a single wee chip so don't go imagining lasers or anything complex (they usually use an LED on the chip for hte light source i think but it's fabricated on the chip and fully enclosed with the receiving part). basically it helps prevent mains hum by splitting the physical electric circuit. Link to comment Share on other sites More sharing options...
Guest iep Posted January 25, 2009 Share Posted January 25, 2009 yeah midi connectors are always optocoupled, i wouldn't say they are "optical" tho, that sounds like optical fibre and other futuristic robocop shit, and midi is keeping it steel (copper), no fibres anywhere. optocoupling used to be very common for isolation and in the 80s every designer would throw in an optocoupler chip or two, just as one would use some cheap bypass capacitors for isolation now. a pretty nasty solution actually, since midi is all digital & pulse-based, and seeing as optocoupler chips have significant slew rates, the pulses will get maimed and you might actually start losing bits when daisy-chaining lots of midi ports together. if you connect more than, say, five midi devices with the THRUs and feed them busy complex MIDI-strings you'll see they'll start choking and skipping bits. edit: what greenbank said (i must've choked and skipped his bit) Link to comment Share on other sites More sharing options...
soundwave Posted January 25, 2009 Share Posted January 25, 2009 'Real world' MIDI was cool over 20yrs ago but is shit by today's standards and in many ways has been holding hardware back for far too long. I can see things going USB (not ideal) but its about time we had something new methinks or at least an increased bandwidth or something. Link to comment Share on other sites More sharing options...
Guest greenbank Posted January 25, 2009 Share Posted January 25, 2009 'Real world' MIDI was cool over 20yrs ago but is shit by today's standards and in many ways has been holding hardware back for far too long. I can see things going USB (not ideal) but its about time we had something new methinks or at least an increased bandwidth or something. it's looking like OSC is going to be the new standard of choice for a lot of new gear, quite a few newer programs and controllers use it already (bidule, reaktor, the monome 40h, lemur, max/msp etc.). Link to comment Share on other sites More sharing options...
ryancolecreate Posted January 25, 2009 Share Posted January 25, 2009 ever one be talkin bout this osc bisness. Link to comment Share on other sites More sharing options...
modey Posted January 26, 2009 Share Posted January 26, 2009 why in the hell don't we have wireless midi yet. i want to rock some keytar action. Link to comment Share on other sites More sharing options...
enki Posted January 26, 2009 Share Posted January 26, 2009 why in the hell don't we have wireless midi yet. i want to rock some keytar action. Well, there is this. A rather expensive way to look like a prat on stage, though. Link to comment Share on other sites More sharing options...
mcbpete Posted January 26, 2009 Share Posted January 26, 2009 And this: Link to comment Share on other sites More sharing options...
Guest acridavid Posted January 26, 2009 Share Posted January 26, 2009 And this: ^ That rocks, I tried it out. Link to comment Share on other sites More sharing options...
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