MIDI cables lenght?

Discussion in 'Converters / Interfaces' started by Cresta, Apr 17, 2006.

  1. Cresta

    Cresta Active Member

    Dec 29, 2005
    hello all :)

    could a MIDI cable lenght affect in some way the latency?
  2. Vaylence

    Vaylence Guest

    The midi cable itself probably will not induce any audible latency. If you are running like 100 ft of cable you may get a few microseconds delay, but most people cant notice less than 20 milliseconds. I would wonder what your buffers are set at, and maybe the midi box you are using. Those would be my guesses as to where the delay is coming from.
  3. Cresta

    Cresta Active Member

    Dec 29, 2005
    oh nope nope, I didn't get any latency, it was just a questions arose between friends, and I was only searching for an answer from a true expert. That's all... :)

    thanks very much for the answer :)
  4. Vaylence

    Vaylence Guest

    For a real answer we could go the physics route, lets explore.

    Electricity travels at 186,282.397 miles per second.

    convert to feet to be a little more usefull

    186,282.397 mi | 5280 ft
    ......................s.........1 mi

    this gives us 983,571,056.16 ft/sec

    This means that for you to achieve one second of delay you would have to have a cable that is almost a billion feet long.

    A human moment lasts about 20ms.

    at 1000ms / s that gives us a cord length of about a million feet

    times 20 (cause 1 ms is way to fast for anyone to notice) equals 1,967,142.11232 or almost 2 million feet long.

    So to answer your question with any degree of scientific backing, you would need a MIDI cable almost 2 million feet long to notice a delay. Of course this is all theoretical and actuall resuslt may very, but you get the idea.

    yay for physics
  5. MadTiger3000

    MadTiger3000 Active Member

    Nov 16, 2004
    Good to know for when I collaborate with my interstellar friends.
  6. lk

    lk Guest

    One day man...........
  7. ecc83

    ecc83 Active Member

    Mar 20, 2006
    northampton uk
    Ref MIDI cables. I dont know a lot about midi but I have read that the max reccomended length is 15mtr(50ft to you colonials) and I am sorry but electricitry does NOT move at the speed of light this is a popular misconception. Radio wave move at C and signals in co-ax move at a fair fraction of it, but not electric current. Think about it. electricity is the motion of electrons along a conductor, they"hop" from atom to atom.
    Now an electron has mass.Not much I grant you, about 1/2000th of a proton, but mass nontheless and nothing having mass can move at C.
    If you are reading this on a crt monitor electrons are zooming toward you at a fair lick, but nowhere near the speed of light! This problem of moving electrons ever faster is why we have reached a possible limit on how fast computers can get.
  8. Kev

    Kev Well-Known Member

    Nov 13, 2001

    either way they move way fast enough
    even over great distance
    to land well inside ... 1 midi tick ... as it used to be known as

    the smallest midi word ... so to speak
    which is faster today than it was back in the early 80's when we first started to change from Korg style Clocking to the new fandangled MIDI
    Musical Instrument Data Interface
    later someone decided that D stood for Digital

    OT Kev !!!

    back to the point

    cable length will not cause Midi Latency
  9. djrr3k

    djrr3k Guest

    Easy answer, MIDI cable length doesn't affect transmission speed (31.25kbps if I'm not mistaken). However resistance in the cable is a factor and you will have missed messages if your cable is too long.

  10. Cresta

    Cresta Active Member

    Dec 29, 2005
    oh... so many complicated answers :shock:
    well, the one thing that do really matter is that a "normal lenght cable" do not affect latency :)

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