Composite video, also called CVBS (Composite Video Blanking and Sync), is the format of an
analog television (picture only) signal before it is combined with a sound signal and
modulated onto an
RF carrier. Composite video is often designated by the CVBS acronym, meaning any of "
Color,
Video,
Blank and
Sync", "Composite Video Baseband Signal", "Composite Video Burst Signal", or "Composite Video with Burst and Sync".It is usually in a standard format such as
NTSC,
PAL, or
SECAM. It is a composite of three source signals called Y, U and V (together referred to as
YUV) with sync pulses. Y represents the brightness or luminance of the picture and includes synchronizing pulses, so that by itself it could be displayed as a monochrome picture. U and V between them carry the color information. They are first mixed with two orthogonal phases of a color carrier signal to form a signal called the chrominance. Y and UV are then combined. Since Y is a
baseband signal and UV has been mixed with a carrier, this addition is equivalent to
frequency-division multiplexing.
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