Satellite TV glossary & definitions – Part 6
One of two colour video signal components used to modulate the colour subcarrier. It represents the colour range from yellowish to green to magenta.
– Quadrature Amplitude Modulation. Type of digital cable tuner.
Radio Frequency (RF):
The approximately 10 kHz to 100 GHz electromagnetic band of frequencies used for man-made communication.
– A potential problem with DLP-based displays characterized by brief streaks of color, especially in fast-moving scenes. The occurrence of these rainbows can be significantly reduced with newer and faster color wheels
The random pattern of illumination seen on a television screen when no video signal is present.
A mechanical switch which uses two thin slivers of metal in a glass tube to make and break electrical contact and thus to count pulses which are sent to the dish actuator controller. The position of the slivers of metal is governed by a magnetic field applied by a bar or other type of magnet.
A highly stable signal used as a standard against which other variable signals may be compared and adjusted.
A ratio of the amount of reflected signal to the total available signal entering a device expressed in decibels.
The blanked-out line traced by the scanning beam of a picture tube as it travels from the end of any horizontal line to the beginning of either the next horizontal line or field.
– TV system where the picture is projected onto the rear of a translucent screen via a series of mirrors and viewed as you would an average television.
– Tendency of the color decoder in many TVs to accentuate the color of red compared to blue and green. Red push is typically introduced intentionally to compensate for an overly blue color temperature.
– The sharpness of a video image, signal or display, generally described either in terms of lines of resolution, or pixels. Visible resolution depends on both the resolution of the display and the resolution of the video signal. Since video images are always rectangle-shaped, they are described with both horizontal and vertical resolution.
– Radiofrequency jack. Audio/video connection commonly used to bring signals from antennas, cable systems, and satellite dishes to components with some type of tuner, such as cable boxes, cable modems, HDTV set-top boxes, VCRs, satellite receivers, TVs, and so on. It can carry video and stereo-audio information simultaneously. When used to connect two components, such as a VCR and a TV, RF provides the lowest video quality of any connection. RF cable connectors usually screw or push onto the jack. Also called F-type, 75-ohm, or coaxial connections.