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Thread: Two Separate Digital Recorders Can't Be Sync'd

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    Just wanted to add my gratitude to all who replied. This was very informative for me!

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    It isn't that the drift isn't linear, it's that the time stretch algorithm won't be linear.
    Jay Walsh
    Farview Recording. I am also the forum spokesmodel for Terasyne Amplification

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    Quote Originally Posted by garww View Post
    Ya, that is normal, and maybe with even two of the same.

    Here's two interfaces synced from the spdif of my word clock, so you did pretty good : )
    Well, if they were actually synced they wouldn't be so far off.

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    Quote Originally Posted by bouldersoundguy View Post
    Well, if they were actually synced they wouldn't be so far off.
    I guess I'm accepting "synced" as a relative term here. Because I know absolutely nothing about word clocks I had just assumed that, like the internal clocks of the recorders, there will be variance. If anything, it does tell me to expect variation, as you've already said...But I can't go anywhere beyond a naive and purely theoretical assumption of what I was seeing in that shot.

    Quick edit: The tracks look to me about 15 minutes out-of-sync with each other (just by quickly eyeballing). That's enough for me to stop worrying about timings on my humble equipment! At least I know what to expect...But there's a need for more experimentation to find out how my clocks are drifting out of sync and hopefully be able to fit that data to some sort of curve. But that's a new ball of wax.
    Last edited by Elmer23; 04-21-2017 at 11:08.

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    No, if the clocks are synced, they are synced. There will be no drift. If that weren't the case, digital audio and video simply wouldn't work.
    Jay Walsh
    Farview Recording. I am also the forum spokesmodel for Terasyne Amplification

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    Quote Originally Posted by Farview View Post
    No, if the clocks are synced, they are synced. There will be no drift. If that weren't the case, digital audio and video simply wouldn't work.
    So garww posted a screenshot of unsynced tracks? Hey, my average 1.25 seconds per hour isn't so bad after all. I'm glad I don't have to worry about this stuff on a regular basis since my Philips doesn't have SPDIF in.
    But I appreciate what you are saying: "synced" should be taken as "synced," and there's less-than-little tolerance for error when evaluating timing equipment.
    Last edited by Elmer23; 04-21-2017 at 15:55. Reason: changed: minutes to seconds

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    Quote Originally Posted by Elmer23 View Post
    So garww posted a screenshot of unsynced tracks.
    Yes. Even if he thought the machines were synced, they clearly were not.
    Jay Walsh
    Farview Recording. I am also the forum spokesmodel for Terasyne Amplification

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    Quote Originally Posted by Farview View Post
    No, if the clocks are synced, they are synced. There will be no drift. If that weren't the case, digital audio and video simply wouldn't work.
    Right, they will be locked sample-for-sample for however long the recording lasts.

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    Quote Originally Posted by bouldersoundguy View Post
    Well, if they were actually synced they wouldn't be so far off.
    You mean they could be less far off : ) The discussion is fairly old about MFG & mags suggesting we only get decent clocking with internal. I suspect the same round of testing on my analog wordclock would be better. This was just black channel testing on a budget and one mid-line interface.

    In my case, I just need to sync some random s/pdif with my Akai DR8. So, I wanted to see how random that could be. haha
    Attached Thumbnails Attached Thumbnails p1120294_crop_700-jpg  

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    Quote Originally Posted by garww View Post
    You mean they could be less far off : )
    If they were actually synced they would not be off at all.

    Quote Originally Posted by garww View Post
    The discussion is fairly old about MFG & mags suggesting we only get decent clocking with internal.
    The findings published by Sound on Sound are that internal clocking is optimal and external clocking is only slightly worse. It counters the unsubstantiated claims of the superiority of expensive external clocks. Both qualify as more than just decent.

    Does Your Studio Need A Digital Master Clock?

    Quote Originally Posted by Sound on Sound
    Overall, it should be clear from these tests that employing an external master clock cannot and will not improve the sound quality of a digital audio system. It might change it, and subjectively that change might be preferred, but it won't change things for the better in any technical sense. A‑D conversion performance will not improve: the best that can be hoped for is that the A‑D conversion won't become significantly degraded. In most cases, the technical performance will actually become worse, albeit only marginally so.

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