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<blockquote data-quote="Arthur Skudra" data-source="post: 56141" data-attributes="member: 131"><p>Re: Dual Channel FFT</p><p></p><p>Mark, even with matched pairs of channels, you still need clock synchronization between input and output, and between multiple interfaces, for your dual channel measurements to be valid. Read that sentence carefully again and again and again until it sticks in your brain. Put together any digital audio system using multiple devices, and you MUST have a word clock master and a bunch of word clock slaves in order for things to cooperate with each other in the digital audio realm. With dual channel measurements it's no different. At present, using only one computer audio interface is a constraint due to differing word clocks between multiple interfaces that are typically designed for a project studio where only one interface is used at any time. If you use multiple interfaces, one needs to be set as the master clock, the rest of them slaved to the master clock, a feature that is not available on most common computer audio interfaces. Yeah, maybe you can mess around with aggregate device managers, or there are exceptions... The new Smaart I/O box has an external clock bus that allows multiple interface boxes to be synchronized, same with the Systune Aubion interface box, and maybe the high end RME stuff and the Roland Octacapture, but everything else is a crap shoot for synchronization.</p><p></p><p>You are also making a lot of ASSumptions on what goes on behind the scenes, the majority of the delay with an internal loopback signal is due to the ASIO or CoreAudio drivers and how the computer audio interface interacts with those drivers, not Smaart itself. I'm not a programmer, nor did I stay at a Holiday Inn Express last night, but you can probably glean some insight in this thread, maybe converse with an experienced programmer like Adam about this:</p><p><a href="http://www.rationalacoustics.com/forums/showthread.php?951-new-to-both-USBPre2-and-SMAART7&highlight=internal+loopback" target="_blank">new to both USBPre2 and SMAART7</a></p><p></p><p>With regards to calibration curves, how would you go about making these without a reference to refer to? In this situation, kinda the chicken before the egg scenario. Why make things more complicated than they need to be? You can get a decent interface for cheap, without having to go through that nonsense!</p></blockquote><p></p>
[QUOTE="Arthur Skudra, post: 56141, member: 131"] Re: Dual Channel FFT Mark, even with matched pairs of channels, you still need clock synchronization between input and output, and between multiple interfaces, for your dual channel measurements to be valid. Read that sentence carefully again and again and again until it sticks in your brain. Put together any digital audio system using multiple devices, and you MUST have a word clock master and a bunch of word clock slaves in order for things to cooperate with each other in the digital audio realm. With dual channel measurements it's no different. At present, using only one computer audio interface is a constraint due to differing word clocks between multiple interfaces that are typically designed for a project studio where only one interface is used at any time. If you use multiple interfaces, one needs to be set as the master clock, the rest of them slaved to the master clock, a feature that is not available on most common computer audio interfaces. Yeah, maybe you can mess around with aggregate device managers, or there are exceptions... The new Smaart I/O box has an external clock bus that allows multiple interface boxes to be synchronized, same with the Systune Aubion interface box, and maybe the high end RME stuff and the Roland Octacapture, but everything else is a crap shoot for synchronization. You are also making a lot of ASSumptions on what goes on behind the scenes, the majority of the delay with an internal loopback signal is due to the ASIO or CoreAudio drivers and how the computer audio interface interacts with those drivers, not Smaart itself. I'm not a programmer, nor did I stay at a Holiday Inn Express last night, but you can probably glean some insight in this thread, maybe converse with an experienced programmer like Adam about this: [url=http://www.rationalacoustics.com/forums/showthread.php?951-new-to-both-USBPre2-and-SMAART7&highlight=internal+loopback]new to both USBPre2 and SMAART7[/url] With regards to calibration curves, how would you go about making these without a reference to refer to? In this situation, kinda the chicken before the egg scenario. Why make things more complicated than they need to be? You can get a decent interface for cheap, without having to go through that nonsense! [/QUOTE]
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