| Author |
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Guest
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 Posted:
Sun Jan 02, 2005 6:47 am Post subject:
YCbCr and YPbPr--whats the difference? |
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Ive got 2 Dish Network hi-def boxes and a TV that has one of each
inputs, one YCbCr and one YPbPr. The Dish boxes put out YPbPr.
To toggle between boxes or use PIP, do I need a tv with 2 YPbPr inputs?
The tv manual is pretty unhelpful other than naming what buttons are
for--no descriptions HOW to hook anything up or how to do PIP or POP or
toggle between sources. If I use one of the S-video or composite
inputs, so I can toggle, I loose my hd on that one signal.
Are these modes totally non interchangeable?
The tv is a Vizio L30, a Sams Club $1200.00 30 incher.
Thanks in advance
Bri
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Jeff Rife
Guest
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| Posted:
Sun Jan 02, 2005 8:24 am Post subject:
Re: YCbCr and YPbPr--whats the difference? |
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(whirled_peas_man@yahoo.com) wrote in alt.tv.tech.hdtv:
| Quote: | Ive got 2 Dish Network hi-def boxes and a TV that has one of each
inputs, one YCbCr and one YPbPr. The Dish boxes put out YPbPr.
|
Your TV is labeled wrong. Most are somewhat incorrect, but yours is really
way off.
YCb'Cr' is digital component video. It's basically what is stored on
a DVD, or inside an HD MPEG stream. There isn't any connector/cable in
common home video use that carries YCb'Cr'.
YPb'Pr' is analog component video. This is what all "component video"
connections carry. Many devices have this labeled as YPbPr, which isn't
technically correct, since it is a difference signal (which is what the
prime marks [apostrophes] mean).
My guess is that your TV uses YCbCr to mean "HD-capable component video" and
YPbPr to mean "not-HD component video".
--
Jeff Rife | "I'm mad as hell, and I'm not going
| to take pan & scan anymore." |
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Sonic
Guest
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| Posted:
Sun Jan 02, 2005 6:12 pm Post subject:
Re: YCbCr and YPbPr--whats the difference? |
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Y Cb Cr is 480i only and will not work with other signals, uses the tv's
hardware to deinterlace. Y Pb Pr works with progressive signals 480p and
others dependent on the tv.
<whirled_peas_man@yahoo.com> wrote in message
news:1104630440.082507.212800@z14g2000cwz.googlegroups.com...
| Quote: | Ive got 2 Dish Network hi-def boxes and a TV that has one of each
inputs, one YCbCr and one YPbPr. The Dish boxes put out YPbPr.
To toggle between boxes or use PIP, do I need a tv with 2 YPbPr inputs?
The tv manual is pretty unhelpful other than naming what buttons are
for--no descriptions HOW to hook anything up or how to do PIP or POP or
toggle between sources. If I use one of the S-video or composite
inputs, so I can toggle, I loose my hd on that one signal.
Are these modes totally non interchangeable?
The tv is a Vizio L30, a Sams Club $1200.00 30 incher.
Thanks in advance
Bri
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Leonard Caillouet
Guest
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| Posted:
Mon Jan 03, 2005 10:16 pm Post subject:
Re: YCbCr and YPbPr--whats the difference? |
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"Sonic" <ergoacess@yahoo.com> wrote in message
news:C9adnWnxVo2ibkrcRVn-gQ@comcast.com...
| Quote: | Y Cb Cr is 480i only and will not work with other signals, uses the tv's
hardware to deinterlace. Y Pb Pr works with progressive signals 480p and
others dependent on the tv.
|
Why in the world would the label it this way?
Leonard |
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Sonic
Guest
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| Posted:
Tue Jan 04, 2005 5:24 am Post subject:
Re: YCbCr and YPbPr--whats the difference? |
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"Leonard Caillouet" <nospam@noway.com> wrote in message
news:A2fCd.10187$7N4.4678@bignews5.bellsouth.net...
| Quote: |
"Sonic" <ergoacess@yahoo.com> wrote in message
news:C9adnWnxVo2ibkrcRVn-gQ@comcast.com...
Y Cb Cr is 480i only and will not work with other signals, uses the tv's
hardware to deinterlace. Y Pb Pr works with progressive signals 480p and
others dependent on the tv.
Why in the world would the label it this way?
Leonard
I've got a LCD tv with this type connection. SD sets that have a connection |
labeled Y Pb Pr that accept interlaced only and HD sets accepting
progressive on the same inputs makes me go huh.
YCbCr is a colour space used in video systems. Y is the luminance component
and Cb and Cr the chrominance components. It is often confused with the YUV
colour space, and sometimes the terms YCbCr and YUV are used
interchangeably, leading to confusion. YCbCr is sometimes abbreviated to
YCC.
YCbCr signals are created from an original RGB (red, green and blue) source
as follows.
Y = + 0.299R + 0.587G + 0.114B
Cb = +(B - Y) / 1.772 + 0.5
= - 0.168736R - 0.331264G + 0.5B + 0.5
Cr = +(R - Y) / 1.402 + 0.5
= + 0.5R - 0.418688G - 0.081312B + 0.5
Here, R, G and B are assumed to range from 0 to 1, with 0 representing the
minimum intensity and 1 the maximum.
YCbCr was defined in the ITU-601 (formerly CCIR-601) standard for use with
digital component video. The same colour space for use in analogue component
video was called YPbPr, although the term YCbCr is often used for both
systems. |
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