Steps to Achieve Perfection – Colorspace,
Resolution, Refresh, and Overscan
Colorspace, or “Why Do I Need a Converter?”
Few people are aware of the differences in various video signal types,
assuming “video is video”. This couldn’t be further from the truth.
VGA is a generic term sometimes applied to “HD-15” connectors, which are
15-pin connectors. VGA connections are generally carrying an RGBHV
signal. “RGBHV” signal is sometimes abbreviated as RGB.
RGBHV stands for Red/Green/Blue/Horizontal Sync/Vertical Sync. It requires
five pathways to pass its signal
.
Component video uses the “YPbPr”
colorspace, and its three cables are often terminated with RCA or BNC plugs.
Component video is sometimes erroneously referred to as RGB due to the
common red, green, and blue coloration of its RCA jacks. RGB is not
component video.
YPbPr includes luminance (black and white information) and sync (Y), blue
image data (Pb), and red image data (Pr), and needs three pathways to pass these signals. Green is generated from a
complex mathematical formula, and does not exist natively on the cables. The “green” cable is luminance and sync, and
includes no color.
RGB and YPbPr are completely different colorspaces, and are incompatible with each other in their native states.
Simple “VGA to Component” cables are not capable of active signal conversion – they simply can’t work in such an
application because they only switch the connector type, leaving the actual signal unchanged.
Solution: To address this issue, a quality converter, like our Audio Authority Model 9A60, Model 1366, or Model 1385
must be purchased to convert the colorspace.
Resolution Compatibility
The next step in making a computer’s output viewable on an
HD television is to convert the computer’s output resolution to
one compatible with the television’s inputs.
Examine the video output settings on your computer. You will
likely see a resolution such as 1024x768, 800x600, or perhaps
1440x900.
Most of today’s HDTVs will not accept the above resolutions
via their component video or HDMI inputs. Those connections
expect standard consumer electronics video resolutions, not
computer standards. Component inputs often only support
480i, 480p, 720p, and 1080i signals. HDMI inputs often
accept only 480p, 720p, 1080i, and 1080p signals. Check
your display device’s manual for its supported resolutions.
Solution: Manually select a computer resolution that is
directly compatible with the HDTV set (1280x720, for
example), or use a third party software program (PowerStrip,
DisplayConfigX) to achieve such a resolution.
A simpler option would be to use an outboard video scaler
(like the Audio Authority Model 1366 or Model 1385) that can
be used to make both the resolution and refresh rate
compatible without adjusting the computer’s video output.
RGBHV “Breakout” cable with BNC plugs and
HD-15 connector
Component video cable (YPbPr) with RCA plugs
ASD
“The Best of Both Worlds: Viewing a PC on an HDTV”
Page 2 of 5
(1 pages)
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