Interlaced scan - Historically, TV CRTs are interlaced, while computer CRTs are not. Interlaced means that the electron beam skips every other horizontal line, filling in the missing lines on the next pass. A frame is composed of 2 fields. One field is all of the odd numbered lines, and the other field is all of the even numbered lines.

4 - 3 - Aspect ratio of traditional NTSC TV screens, with 4 unit width by 3 unit height.

Metadata - Informational data about the data, included in a signal's data stream.

Native format - Some DTVs will convert the 18 ATSC formats into 1 or 2 formats and will draw only those. For these sets, the `native' format is - 1. the formats the set will draw or - 2. the original format. (These are contradictory definitions, but they reflect current practice. 1 is probably the preferred meaning.)

PVP-UAB - Protected Video Path User-Accessible Bus. Encrypts video content as it passes over the PCI Express bus from the high-def disc to prevent other PCI Express devices from intercepting the video stream.

Barn Doors - A term used in television production to describe the effect that occurs when a 4:3 image is viewed on a 16:9 screen. When this happens, viewers see black bars on the sides of the screen or "barn doors."

Aspect ratio - The ratio of screen width to screen height. For TVs it is either 4:3 (1.33:1) or 16:9 (1.78:1). Theater film uses many different aspect ratios, some as high as 2.5:1.

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