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Old 12-08-2011, 08:37 PM   #1
rhodebump
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Default ADVC 110 low volumn when capturing problem

Hi,
I have a ADVC 110 that I am using to capture some old camcorder footage using iMovie.

The sound is there, but much too low.

Any tips?
Thanks,
Phillip
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Old 12-09-2011, 02:04 AM   #2
GrassValley_BH
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Need to know a little more about your configuration.

Does the camera have on-screen audio meters, and if so, what level are they showing?

If you're using a lower-end camera, it may only have Monaural output.

If you use a Y-splitter to connect to both left and right, it will drop the signal level significantly.

In that case, run audio only to the Left channel audio input on the ADVC and duplicate the channel in software after capture.
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Old 12-09-2011, 02:04 PM   #3
dpalomaki
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Not specific to the ADVC110, but I ran some test onthe ADVC300 audio section. I suspect the 110 behaves similarly. Results at:
http://forum.grassvalley.com/forum/s...ad.php?t=23415
also see
http://forum.grassvalley.com/forum/s...ad.php?t=23381

The followign may or may nto apply to the specifics of your configuration and gear but it does apply to many "average" situations with consumer and soem prosumer gear.

In general consumer gear audio is recorded at an aveage level of -10 dBV or about 0.3 volts. Passed through the ADVC this will result in a signal that averages about 16 dB below maximum digital record level. (Part of the reason for this large difference is to allow for dymanic range and transients in program material.) However, this may look/sound like a low level if the matrial does not have a wide dynamic range.

One solution is to normalize or amplify the sound when editing in your NLE. Just warch you do not introduce unwanted clipping or other distortions. Using some audio compression, limiting, and amplification can yield a higher average loundess (like TV commercials) while staying under the maximum digital record level. There was a recent discussion of tools to asses audio loudness in the Edius forum.
http://forum.grassvalley.com/forum/s...ad.php?t=24418
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Old 12-09-2011, 05:37 PM   #4
rhodebump
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Thanks for the tips. Makes sense to me.

The camcorder has only one output plug, and I have a splitter that I am running to left/right.

I will look at how to duplicate the channels.
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Old 12-09-2011, 05:51 PM   #5
rhodebump
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Default Buy preamp or use software?

If you had several hours of video to capture in which you need to boost the sound, would it be worth it to get a preamp, or stick with a software solution?

I see pre-amps for $50 on ebay and I am thinking this would be worth it to get it vs. effort.

Thanks again,
Phillip
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Old 12-09-2011, 06:44 PM   #6
dpalomaki
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It would depend on the relative noise floor and other quality factors of the preamp output compared to the ADVC (after post capture gain is added), the capability of your audio editing software, your final product needs, and what you plan for the preamp when the project is done.

If you have a need for a preamp anyway, get one, but be sure it is a decent one. But if this is a one-time job with no need for the pramp after the job is done, I would try a quick test of the software approach on a bit of typical video and if you are satisfied with the results, no need for the preamp.

The quality of a $50 preamp from e-bay would likely be hit or miss - some makes/models are much better than others, and previous owner use/abuse is not always easy to judge.

Whether or not the "Y" splitter is causing an audio level issue depends on the output impedance of the audio source (camcorder) and the input impedance of the ADVC, and may not be well documented. It could be as much as 6 dB difference (worst theoretical case), but is more likely on the order of 0.5 to 2 dB with real world consumer gear.

Last edited by dpalomaki; 12-09-2011 at 06:59 PM.
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Old 12-12-2011, 07:42 PM   #7
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I recommend not using the splitter run it just to the Left input, and using your NLE to duplicate the audio channel to the other side.
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Old 12-13-2011, 02:21 AM   #8
kbosward
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I have used a splitter from a mono camera to ADVC-300 without noticeable drop in audio level. It is much better to do it that way for me because I am using an older computer and an older editor, and duplicating an audio channel in software introduces delays for me in the editing/preview process. It may not be an issue on a newer computer or better video editing software, but my point is that I did not notice a drop in audio level (nor did I need to adjust the audio gain) with my ADVC-300.

Ken.
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