Audio power is the electrical power transferred from an audio amplifier to a loudspeaker, measured in watts. A meaningful and reliable measure of the maximum power output of an audio amplifier is continuous average sine wave power. The peak power of a sine wave of RMS (root mean square) value X is √2*X; conversely, the RMS value of a sine wave of peak X is (1/√2)*X.
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The aspect ratio of an image is its width divided by its height.
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The Digital Visual Interface (DVI) is a video interface standard designed to provide very high visual quality on digital display devices such as flat panel LCD computer displays and digital projectors.
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S-Video (Separate Video also called Y/C) is an analog video signal that carries video information as two separate signals: luma (luminance, intensity) and chroma (color).
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Channel Labeling allows you to put the Call Letters on the screen along with the station numbers, so you always know what channel you're watching.
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Closed captioning is a term describing the process of displaying text on a television, video screen or other visual display to provide additional or interpretive information to individuals who wish to access it.
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Picture in Picture (PiP) is a feature of some television receivers and similar devices. Oneprogram (channel) is displayed on the full TV screen at the same time as one or more other programs are displayed in inset windows. Sound is usually from the main program only.
More on “PiP” at en.wikipedia.org

Picture by Picture, Picture in Picture

Comb filters implemented in hardware (and occasionally software) for PAL and NTSC television decoders. The filters work to reduce artifacts such as dot crawl.
More on “Comb Filter” at en.wikipedia.org