Encoded Video Signals

Encoded Video Signals

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Despite the rise of digital signals, you’re
still going encounter some encoded or limited bandwidth video signals. By the end of this
video, you’ll be able to identify common encoded video signals. Here’s an image of
some outputs on the back of a piece of video equipment, including some encoded analog video
outputs. You’ve probably seen inputs and outputs that look a lot like this on consumer
equipment too. In the center, you see the outputs for a component video signal. A component
signal uses three wires. One wire carries sync and signals for color brightness, called
luminance. Luminance signals have enough image detail to create a black and white version
of the image. The combined luminance and sync signal is known as Y. The other two signals
carry red and blue color difference signals. Basically, these signals are red and blue,
minus luminance. On the bottom center of the panel is an output for S-Video. S-video uses
two signals: Y, the combined luminance and sync information, and C or chroma, the combined
color difference signals. It may be carried on two separate cables, or one cable with
a four-pin connecter. Just to the left of the S-Video, you see an output for composite
video signals. Composite video combines all the video information on one cable. It is
also known as baseband video. Once all the video signals have been combined, it’s difficult
to separate them cleanly. Composite video is therefore prone to artifacts, small disturbances
that reduce signal quality. Finally, on the bottom left, you see a coaxial output for
RF signals. RF signals combine audio and video information on a single radio frequency. RF
signals carry the lowest quality of analog video signals. Analog television signals are
transported this way. The audio and video for each channel are sent to a modulator,
which combines them on a single frequency. When you select an analog television channel,
you’re really selecting a specific radio frequency. You can visualize RF signals as
high-rise building. Each floor of the building is a different frequency or channel. The user
chooses a floor, and finds all the information for that channel, audio and video, packed
in a single space. You’re more likely to encounter some of these signal types than
others. Current digital video standards do not include either S-Video or composite formats. 
You will find digital RGBHV and component video formats, however. RF can also be used
carry digital television signals. These days, though, you’re most likely to use a digital
signal like HDMI than any of these analog formats. Thanks for watching Encoded Analog
Video Signals.

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