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Glossary
Definition
Automatic Gain Control (AGC)
AGC is a circuit designed to boost the amplitude of a signal to
provide adequate levels of recording.
Aspect Ratio
The width to height ratio of an image. A 4:3 aspect ratio means
the horizontal side is a third wider than the vertical size. Standard
television ratio is 4:3 (or 1.33:1). Wide-screen DTV and HDTV
aspect ratio is 16:9 (or 1.78:1).
Alpha Blending
This is the way of combing two images by blending together at
factor of alpha. Alpha denotes the blending factor.
Caption
A textural representation of the audio information in a video
program. Captions are usually intended for the hearing impaired,
and therefore include additional text to identify the person
speaking, off screen sounds, etc.
Chroma
The color component of a video signal, independent of the luma.
Chrominance
The color component (hue and saturation) of light independent of
luminance. Technically, Chrominance refers to the linear
component of video, as opposed to the transformed non-linear
chroma component.
