Comb filter - A circuit in NTSC sets that separates the color information from the brightness information.
CRTC - Canadian Radio-television and Telecommunications Commission, the federal regulatory body for television programming and broadcasting in Canada.
Down Converting - Process by which a high-definition signal is converted to a standard definition picture.
Aspect Ratio - the ratio of image width to image height. The term may apply to the display device configuration, or the shape of the content being displayed. (See Letterboxing) HDTV uses an aspect ratio of 16 units wide by 9 units high. Conventional television programming and displays are at an aspect ratio of 4 - 3. Digital SDTV programs may aspect ratios from 4 - 3 to 16 - 9, dependant on content and its source (e.g. upconverted NTSC is likely to be 4 - 3).
Letterbox - The full display of a wide aspect ratio 16 - 9 picture on a display of aspect ratio 4 - 3 will result in black bars above and below the picture. This arrangement is referred to as "Letterbox" and is often seen during movies shown on television.
HDTV - (High Definition TV) - A TV that displays 1280x720 pixels or better.
Pan-and-scan - A method of broadcasting a wide screen film on a 4:3 channel. Most of the time just the center of the image is shown. (The right and left edges are clipped off.)
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