Definitions of DTV, HDTV & 3DTV Terms

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Term Definition

Active LCD Glasses 3D glasses which alternatively cover the view in each eye in sync with the display source so that each eye sees the alternating images required to create the 3D illusion. The rapid shuttering is faster than the brain can detect, so it isn't noticeable to the viewer. (The alternative to Active LCD Glasses are Polarized Light 3D Glasses.)
Adapters Additional equipment/devices needed to attach an existing Twin Lead antenna wire to a digital-to-analog converter box.
Anaglyph 3D The "old" way of creating a 3D image using color filters (usually red/blue) to show a different image to each eye. This method is being replaced because it compromises the actual colors of the presentation.
Analog TV Analog television encodes television picture and sound information and transmits it as an analog signal (one in which the message conveyed by the broadcast signal is a function of deliberate variations in the amplitude and/or frequency of the signal). All systems preceding DTV (e.g. NTSC) are analog television systems. Analog technology has been in use for the past 50 years to transmit conventional TV signals to consumers.
Analog Channel A communications path that carries voice or video in analog form � as a varying range of electrical frequencies (See Analog Signal).
Analog Pass-Through Digital converter box capability, which allows analog broadcast signals to pass through the converter box to be tuned by your analog TV.
Analog Signal A type of signal that encodes voice, video, or data transmitted over wire or over-the-air that is commonly represented as an oscillating wave. An analog signal may vary in frequency in response to changes in physical phenomena, such as sound, light, heat, position, or pressure.
Analog Spectrum A traditional range of frequencies used for radio and television transmission. This is a less-efficient and lower-quality system that uses Radio Frequency (RF) waves to transmit and display pictures and sound.
Analog Transition Date In the US, this refers to June 12, 2009, which was the DTV Transition deadline mandated by Congress for the turnoff of analog broadcasting by full-power TV stations. Other countries have also set deadlines for the transition from analog to digital broadcasting.
Antenna Device designed to receive the radio waves broadcast by television stations.
Aspect Ratio Screen's width as compared to its height. For example, for 4:3, the traditional TV aspect ratio, a 32-inch TV would be 25� inches wide and 19 inches tall. A 16:9 widescreen 32-inch TV is closer to a movie screen than a traditional TV, and would be 28 inches wide and 16 inches tall.
ATSC Advanced Television Systems Committee. This is the name of the DTV system used by broadcasters in the U.S.
ATSC Tuner Often called an ATSC receiver or HDTV tuner, allows reception of DTV signals broadcast over-the-air by TV stations. May be integrated into a television set, VCR, DVR, or set-topbox.
Autostereoscopic 3D "True 3D" which does not require glasses to create the 3D image.