At 8:28 PM -0800 11/11/06, jdow wrote: >From: "Tony Nelson" <tonynelson@xxxxxxxxxxxxxxxxx> >> At 9:41 PM -0500 11/11/06, Gene Heskett wrote: >>>On Saturday 11 November 2006 21:00, Tony Nelson wrote: >>>>At 4:21 PM -0500 11/11/06, Gene Heskett wrote: >>>> ... >>>> >>>This thread might be of interest to the linux-audio-dev group, so I've >>>added them to the Cc: >>> >>>>>Yup, and its been a constant src of amazement to this old fart that >>>>> when the midi spec was setup, they used a serial port, thats fine, but >>>>> when they set the data rate at only 31,250 baud, ... >>>>> >>>>>Consistently attrocious timeing, with the horns always 1/16 beat late >>>>>unless the actual output order of each instrument is scrambled in the >>>>>order output. That would make it sound a heck of a lot less >>>>> mechanical. And there isn't a heck of a lot that can be done until we >>>>> put midi on an optical circuit running at several megabytes/sec. >>>>> Something like TOS maybe? >>>> >>>>Firewire. Many products already, plenty of speed, almost robust enough. >>>>1/8 millisecond isoch cycle times; each cycle can contain packets from >>>> many senders; each packet can contain lots of notes. >>> >>>More robust IMO than the din connectors now used for midi interconnects, >>>however the cabling itself can't help but be more fragile when subjected >>>to the rigors of a jam session with bodies walking on them all night. >>>And that has to be a consideration else the first users will get >>>discouraged at the high cable failure rates and revert, particularly if >>>they have a tin ear and can't hear what to many of us would be an >>>extremely obvious improvement. >>> >>>But I like that idea, a lot. Maybe some enterprising LAD people could get >>>together and spec something like a midi interface running over firewire, >>>complete with the repeaters so it can be daisy-chained just like midi can >>>be, and hopefully release it into the PD as a new midi-2 interface >>>standard. And design it such that it never, ever gets into the snails >>>trail of the 31,250 baud interface it uses today. >> >> It's already done. MIDI runs over Firewire, along with audio. Google for >> "midi firewire". Buy it now. > >Look at its specs. It is designed to closely mimic wire transport. So >any given chunk of virtual wire is going to be as slow as MIDI wires. >... How can that be? MIDI latency is determined by the bit rate of serial transport. Firewire MIDI latency is improved by the high bit rate, delayed only by the 8 per ms Isoch frame rate. There's no need for greater than 1/4 ms latency on Firewire MIDI for even a large number of MIDI events (notes, aftertouch, what have you). -- ____________________________________________________________________ TonyN.:' The Great Writ <mailto:tonynelson@xxxxxxxxxxxxxxxxx> ' is no more. <http://www.georgeanelson.com/>
