On Jul 11, 2014, at 11:17 PM, Mark Spano wrote:
> As far as what they're calling 'blanking', I've had people cite this when they actually mean 'active picture area', in other words, everything inside the 1920x1080 bounds. This can be hard to spot, especially on monitors that have black bevels, since what you're looking for is a line or two of black around the edge.
I offered:
> That's what 'scopes are for. A waveform scope will accurately show you what is part of the picture and what is not.
On Jul 12, 2014, at 2:05 PM, bigfish@pacbell.net wrote:
> Yes they will but do you know of an exact spec like the old composite days? I can look at Y in a two line display and measure from end of active picture to start of active picture. I'm curious why I've not seen an exact number for this duration. Perhaps I've mis interpreted the things I've heard.
I respond:
I honestly can't answer that one either. Part of the reason might be related to the fact that since everything is digital now, there's no actual duration for the sync pulses. Heck, there ARE no actual sync pulses! That info is all in the data stream now.
So, you look at a waveform scope of the digital Y signal and try to find where the picture starts and ends. That's the best I can do . . . ;) But it's got to be more reliable and accurate than going by a picture monitor. Monitors can vary, each one from the next.
Dennis Degan, Video Editor-Consultant-Knowledge Bank
NBC Today Show, New York
NBC Today Show, New York
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Posted by: Dennis Degan <dennyd1@verizon.net>
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