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SDI audio levels

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david davidson
SDI audio levels
on Jul 21, 2005 at 6:47:50 am

When sending perfectly mastered audio over an SDI channel--be it HD or SD--would there ever be an occasion that a deck would show overmodulation of signals? We've sent a SDI stereo pair to a D5 w/ the PCM input channels to unity using a blackmagic HD card w/ a FCP 4.5 system. I'm curious to know, if the digital audio is properly limited, would sending audio via SDI need any level adjustment on the deck?

FCP doesn't add any gain whatsoever--as far as we know--because mastering Digibeta via SDI produces excellent repeatable results for audio.

Has anyone had such an experience where SDI audio was overmodulated or peaked? Sorry for cross-posting!


David Davidson
Visual Effect Supervisor
solventdreams, llc
4222 santa monica blvd
los angeles, ca 90028
323 906 9700

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Jon Zanone
Re: SDI audio levels
on Jul 26, 2005 at 12:28:21 pm

Audio is seperate from an SDI signal, no? My experience with SDI is that it's a seperate signal from audio. In my case, I'm sending out SDI video, and analog audio (it is possible to send digital audio, but we're not set up that way...).

If you are sending out a proper signal from your deck, you should be getting good audio. Is there a DA somewhere in the signal path? Is it possible you are sending an analog audio signal, but seeing a digital signal in your meters?


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Re: SDI audio levels
on Jul 27, 2005 at 8:54:30 pm

We use SDI for audio all the time. It's great. no messing with levels necessary what comes out goes in. The advantage of Digital.

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