Black level of component video signal ( YPrPb, YCrCb )?

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spktu

Joined: 03 Jan 2004
Posts: 90

21 Jan 2005 8:57 black level in video signal

Is there a standard defining the black level of component video signals ( YPrPb, YCrCb )?
Should it be 0V for each three of them or 1-2 V is also acceptable?

IanP

Joined: 05 Oct 2004
Posts: 6492
Helped: 1542
Location: West Coast

21 Jan 2005 9:14 Re: Black level of component video signal ( YPrPb, YCrCb )?

Component (YCrCb) Y - 1vpp
Cr – 700mv pp
Cb – 700mv pp

SDTV Cr=0.713(R-Y), Cb= .564(B-Y) For black, grey or white both signals are +350 mV For the strongest colours a maximum of 350 mV will be added or subtracted depending on the colour.

HDTV Pr=.6349(R-Y), Pb=.5389(B-Y) For black, grey or white both signals are +350 mV For the strongest colours a maximum of 350 mV will be added or subtracted depending on the colour.

spktu

Joined: 03 Jan 2004
Posts: 90

21 Jan 2005 9:42 I asked about "black level" voltage a the front po

I asked about "black level" voltage a the front porch, not peak-to-peak voltages!

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ynhe

Joined: 28 May 2001
Posts: 326
Helped: 4
Location: China

21 Jan 2005 11:54 Re: Black level of component video signal ( YPrPb, YCrCb )?

Hi
see EIA-770.2 "Standard Definition TV Analog Component Video Interface"

ynhe

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VVV

Joined: 26 Nov 2004
Posts: 1584
Helped: 290

22 Jan 2005 7:21 Re: Black level of component video signal ( YPrPb, YCrCb )?

Generally this level does not matter, since most video inputs are AC coupled, followed by a DC restoration circuit. So under these circumstances, even with 1-2VDC measured at the video output, things should be OK.