On Thu, January 24, 2013 5:43 pm, Fons Adriaensen wrote:
> When I was working at BRTN (which was the in analog video era - I've even
Our on air was 2" machines. 5 of them. A very busy place during commercial
For out of station feeds we had a (at the time very expensive) frame store
unit for sync.
And the frame which is actually two vertical scans... at least over here
in NTSC land. (NTSC = Never Twice the Same Colour)
> the sample frequencies match. MADI and ADAT inputs can be designed so they
Yes for audio (MADI, ADAT, AES3 or whatever else) phase is not the problem
it once was for video. I would imagine the video world has added frame
store to all the inputs of the switchers by now.
> For PRO audio the solution is indeed to use a central clock [*]. This can
This is the difference from video. Video can actually be somewhat out
frequency wise as the frame store can "cheat" during the V retrace to keep
things aligned. Audio can't do that, it has to be the same frequency (if
not phase) or there are artifacts.
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