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Old 05-09-2017, 04:02 PM   #1
wcardone
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Default ADVC-G1 Audio Out Greatly Reduced

Product: ADVC-G1 Any In to SDI

Input: 480i video/audio
Video Port: Y/CVBS

Problem Statement:
The audio output embedded in the SDI OUT is objectionably reduced. I don't remember the numerical magnitude but would estimate it is -18 to -20dB. The audio can be restored to 0dB in post using any ordinary audio editing tool and appears to be satisfactory.

I have confirmed that the problem is not with the original audio source by downloading the same video using another device (ADVC-300).

The ADVC-G1 +4dB DIP switch option is engaged. If it makes a difference it is too small to see without careful editing inspection.

Note: the G1 BNC output is being fed to an Epiphan AV.io-SDI device which delivers USB 3.0 video. I have not confirmed that the loss does not occur in this device. it just didn't occur to me to check but I would not expect it to be the source of the problem.
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Old 06-14-2017, 11:44 PM   #2
wcardone
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That was back in May when I posted this. Still nobody has anything to say.

The DIP switch 4 allows a selection of +0dBu or +4dBu audio gain. The position of this switch makes no difference in the captured audio.

We've got to do better than this, folks.
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Old 06-15-2017, 02:28 AM   #3
wcardone
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MY WORKAROUND:

Some might call this a solution but I will call it figuring out how to make something deficient provide satisfactory results.

I insert a stereo amplifier between the G1 and the A2D converter. It was actually a mixer board not intended to provide any gain so I am wondering if we are talking an impedance mismatch.

Anyhow, I don't have to normalize the audio as a second step after the download.
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Old 06-15-2017, 06:20 AM   #4
GrassValley_PS
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I am guessing that very few people here have that device. I do have it and have never had any audio problem with it.
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Old 06-15-2017, 06:54 AM   #5
antonsvideo
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if using analog audio inputs from semi pro or domestic decks, 0db will give you a much louder capture sound than +4db

+4db is suitable for pro and broadcast players that have XLR balanced output only
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