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Digital/HDTV Terms that Begin with F

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Field
In interlaced-scan video, each complete frame is split into 2 sequential fields, each of which contains half the scanning lines of the frame. One field contains the odd scanning lines, and the other field the even lines.

Flat-panel TV
Any ultra-thin, relatively lightweight TV — especially those which can be wall-mounted. Current flat-panel TVs use either plasma or LCD technology.

FM
Frequency Modulated.

Frame
A complete, individual picture in a movie film. In a video signal, a frame contains all of the picture's scanning lines. The frame rate of a progressive-scan format is twice that of an interlaced-scan format.

Frame Rate
The rate at which frames are displayed. The frame rate for movies is 24 frames per second (24 fps). In regular NTSC video, the frame rate is 30 fps. The frame rate of a progressive-scan format is twice that of an interlaced-scan format — example: the frame rate for 480i DVD is 30 fps (or 60 interlaced fields per second); for progressive-scan DVD at 480p, it's 60 fps.

Frequency
The number of times per second that a signal fluctuates. The international unit for frequency is the hertz (Hz). One thousand hertz equals 1 KHz (kilohertz). One million hertz equals 1 MHz (megahertz). One billion hertz equals 1 GHz (gigahertz). Television is broadcast in frequencies ranging from 54 MHz to 216 MHz (VHF) and 470 MHz to 806 MHz (UHF).

Frequency Response
A measure of what frequencies can be reproduced and how accurately they are reproduced. A measurement of 20 to 20,000 Hz ± 3dB means those frequencies between 20 and 20,000 Hz can be reproduced no more than 3 dB above or below a reference frequency level. 

Front-projection TV
A 2-piece display system consisting of a separate front projector (typically placed on a table or ceiling-mounted) and screen. Front-projection systems can display images up to 20 feet across, or larger. Traditionally, CRT projectors were found only in high-end home theaters, but compact digital projectors using DLP or LCD technology have lowered the cost of front-projection systems considerably.

Full-Range
A speaker designed to reproduce the full range (20 Hz to 20 kHz) of audio frequencies.