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Analog Audio in Control Panel
In the “Control” tab of the AJA Control Panel, there is a box called “Analog Audio Level”. There are 2 choices: “+18 dBu FSD” or “+24 dBu FSD.”
1. What do these settings mean?
2. What is “dBu FSD?”
3. What should I have it set to, in which circumstances?My system:
Dual G4 1.42 GHz
2 GB RAM
OS 10.3.9
FCP 4.5
QT Pro 6.5.2
Compressor 1.2.1
AJA Io with Driver v2.0 and Firmware Update v23-28
AJA ProIO Control Panel v 1.0.0
Uncompressed 8-bit 4:2:2 via SDI to/from DVW-A500massachi
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8 Replies
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FSD refers to Full Scale Digital. According to Wikipedia it is “The maximum amplitude a digital system can represent.” They go on to say “Once a signal has reached full scale all headroom has been utilized, and any further increase in gain results in an error known as clipping.” I would imagine that most decks and small mixers would conform to the 18dbu FSD specification. If you hear distortions on peaks then you can try the 24dbu FSD setting.
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On Wikipedia they talk about FSD in regards to digital audio. But the place on the Io Control Panel that I see this setting is in the area called “Analog Audio Level”. Does that mean that you can set the analog output level to be the equivalent of a digital audio setting with 18 dBu of head room or 24 dBu of head room? Does that make sense?
What is the difference between dBu and dB?
massachi
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It makes sense to me because although you’re bringing the audio in via analog, it has to eventually go through the Io
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Thanks a lot, Lee. Very helpful post.
massachi
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Your are welcome massachi. I also learned something myself as I did not know what FSD and dbu referred to until I looked it up.
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where do you find this control panel?
thanks -
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Ok thank you for your help
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