Audio Recording Crackles / Pops / Stutters

Hi All,
I didn't quite know under which category to put this post. Moderator, please feel free to re-assign it to the appropriate forum.
The title explains my situation pretty clearly. The details are that When I use the built-in mic in my web cam for things like Rosettastone (languages), or ScreenFlow (making screencast recordings), the audio always pops. Not just once and a while, either, but with almost every word picked up.
I'm using a UVC USB web cam (Rosewill RCM-3201V) plugged directly into my mini. Previously I had it plugged into the USB hub, thinking that may cause some irregularities, but plugging it directly into the mini didn't fix it either.
Any ideas what can be done to address this?

Hi DaddyPaycheck,
As I mentioned, this is a UVC camera, which means it doesn't require drivers and is compatible with all operating systems. That being the case, I have not needed to install any drivers or software to run the web cam.
http://en.wikipedia.org/wiki/USBvideo_deviceclass
From other threads I have seen it appears that this might be a sample-rate issue, where the camera is providing a different sample rate than my Mini is expecting. But I have no idea where I would begin to find out if they are different, and then how to adjust them.
-Mike

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    Message was edited by: progressia

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    My 12 minute short has developed annoying audio
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  • 1212M Crackling/Popping - New Drivers

    I'm kind of cranky about this problem. Read on because I actually know exactly what the problem is (at least for most of us and only Creative/EMU can fix it).
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    - Starts with a few minor crackle/pops per second and gradually gets progressively worse over several minutes with nothing else changing in the system (ie not running new software or changing anything).
    - After a while (can be a long while) the crackling can actually go away again and you have clean audio. Then the crackling returns. Once again with no changes in system load in between.
    - You can make the crackling go away instantly and every time by simply resetting the clock on the card. There are several ways to do this. In Patchmix go to the System tab under Session Settings and switch the clock between internal/external (whatever you have it on, go to the other and back again). Another way is the change the ASIO Buffer Latency milliseconds in your host software's ASIO control panel.
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    Once we understood the problem, in our next version we modified our software to use a larger buffer. This eliminated the problem for some of our customers whose hardware clock was only very slightly out spec. However, for other customers the problem remained, although by increasing the buffer size it made it take longer for the pointers to reach each other and the crackling to begin. This is the what I suspect EMU has done with the new Win7 beta drivers. With the new drivers my crackling takes longer to appear. In these forums we see reports from some long-time sufferers of the problem that the new driver fixed their problem and from others we hear that they are still having the problem.
    Since we still had unhappy users of our video/audio application software, we kept working on the issue and eventually came up with a fix that solved the problem for all users and all audio hardware. It was hard to implement but this is what EMU/Creative needs to have their driver engineers do to actually fix the problem (short of replacing an enormous amount of hardware).
    The problem can be solved in the driver (yes, my old company actually embedded our own low level generic driver in our application software). Since EMU/Creative is making their driver themselves they can just implement this fix there. The secret is for the driver to actually keep track of where the write and read pointers are and each time they get too close to each other it stretches or shrinks the next packet of data by averaging the audio samples in that packet to the exact size needed to put the pointers 180 degrees apart again. It then resets the pointers as it writes that new data. The data shrink or stretch prevents a single pop or click from happening when the pointers are reset to their correct positions. Frankly, this was hard to implement but it worked perfectly. We actually hired a consultant to figure this audio problem out who was a former Microsoft engineer who wrote the WDM kernal mode drivers.
    EMU SUPPORT please let your product manager know that this is what is going on and that he should ask your contract driver engineers to implement this type of solution. Yes, it will cost more in development time (and hence $$$), but it will fix the issue once and for all and not just for this card. You can re-use the code in other drivers.
    If you need specific help, I'll even connect you with the engineers that did it for a more detailed explanation (we sold our company years ago and the team has split up but I'm still in contact with most of them).

    Markran,
    Thank you for the information. I will make sure that it gets routed to the correct people.
    Casey

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