Coffee Posted March 8, 2018 Share Posted March 8, 2018 Will 10 meters long USB cable, create an input lag/ latency especially playing VST instruments ? Quote Link to comment Share on other sites More sharing options...
AlenK Posted March 8, 2018 Share Posted March 8, 2018 I doubt it. Latency in MIDI over USB is not a function of cable length. (OTOH, if cable length is too long you can get actual communication errors.) It's mainly a function of the software at either end of the connection. While MIDI over USB has much greater throughput than MIDI over the original DIN connectors, I have always heard that the former has inherently greater latency than the latter because of the software overhead associated with USB. Quote Link to comment Share on other sites More sharing options...
Coffee Posted March 8, 2018 Author Share Posted March 8, 2018 Ah, i recognized another problem... USB 2.0 standard allows up to 5 meters. If we want more, we must buy repeater cable. Quote Link to comment Share on other sites More sharing options...
Coffee Posted March 13, 2018 Author Share Posted March 13, 2018 I bought (USB 2.0) 5 meters long cable with active repeater. No problems such as latency. Quote Link to comment Share on other sites More sharing options...
- T - Posted March 14, 2018 Share Posted March 14, 2018 From "Propagation Delay between Host Transceivers and Downstream Ports" http://www.usb.org/developers/docs/whitepapers/Propagation_Delay_between_Host_Transcievers_and_Downstream_Ports.pdf "Section 7.1.19 of the USB 2.0 Specification discusses delays. There you will find that signals in a cable must travel from connector to connector within 26ns (5.2ns/m max.). This is why standard detachable cables are limited to 5 meters." As Alen has already stated, as long as you remain within the 5 meter requirement, the bulk of the latency in any USB 2.0 system is going to come from the software and processing speed of the devices at either end of the cable. There are any number of folks out there, who would be more than happy to get their VST latency figures down to the range of nanoseconds, when they are typically dealing with it in the range of milliseconds. That is a factor of one million difference. 5.2ns/m is about 64% of, or a little less than 2/3, the speed of light in a vacuum. That's pretty quick, but you have to realize that with state of the art devices, you are dealing with processors at either end of that cable that are just as quick, and when they do not receive a packet of data when they expect it, they start issuing time-out errors, and everything goes down the proverbial drain from there. - T - 1 Quote Link to comment Share on other sites More sharing options...
Display Name Posted March 14, 2018 Share Posted March 14, 2018 I'd move the computer and keyboard rig to be closer together Quote Link to comment Share on other sites More sharing options...
Coffee Posted March 15, 2018 Author Share Posted March 15, 2018 On 14.03.2018 at 7:11 PM, Scott Hamlin said: I'd move the computer and keyboard rig to be closer together My room is not suitable for that right now. Quote Link to comment Share on other sites More sharing options...
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