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40 IRE of Color burst…..
I have a delivery requirement on Digibeta that has some
rather strict standards to adhere.2 that I’m not familiar with (at least the wording)
40 IRE of color burst….I take that to mean don’t exceed 40 on a vector scope?
40 IRE of sync……??? what does that mean?
2 others:
horizontal blanking width to meet RS 170A requirements?
Record in 2 field for DBC.
anyone?
I’ve delivered countless TV spots over the last 8 years and a few network shows (no rejections) , but these “terms” have me a little stumped.
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2 Replies
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If you look on a Waveform monitor, the Color Burst signal should measure 40 ire units from top to bottom. I usually put the bottom of the burst signal on the 0% line and then make sure that the top is at +40 ire on the scope. Make sense?
It’s the same with the sync signal. It should extend from the 0% line and then down to -40 ire again on the waveform monitor.
The horizontal blanking is the area that extends from a line of active video and includes the front porch, the blanking pulse, the breezeway, the color burst pulse and the back porch. Really, I’m not making this up!
As for the 2-field requirement, I’m not sure about that one. Possible it might have to do with having your record machine set to a 2-field reference rather than locked to a 4-field sequence. Just a guess on this one.
Google “Tektronix” or go to:https://www.tek.com/Measurement/App_Notes/NTSC_Video_Msmt/glossary.html
for a good diagram of the horizontal blanking standards.
Man, I haven’t used this stuff for years! I’m surprised that I still remember it all. And they said I’d never have to use this stuff.
Tom -
thanks Tom!
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