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Glossary

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Term	Description
1080i	1080i is ATSC high definition 1920 x 1080 interlaced video format where a frame of video is delivered in two fields. The first field contains the odd lines of the image, while the second field contains the even lines. Each field is updated every 1/60th of a second resulting in 30 frames of video per second.
1080p	1080p is ATSC high definition 1920 x 1080 progressive scan video format where a complete frame of video is delivered at either 60 or 24 frames per second.
16:09	Aspect ratio of an HDTV signal which is 16 units by 9 units, whatever size those units may be. In the film trade aspect ratios are described in relation to one, which means this aspect ratio is described as 16/9 or 1.78 1.
2:2 pull-down	Method for transferring 24 frame-per-second film to PAL/SECAM video running at 25 frames per second.
3LCD	Common 3 color system for projecting images via LCD or liquid crystal display. Uses dichroic mirrors to separate the RGB components of white light coming from a projection lamp. Each color is feed to separate LCD panels which control the about of colored light that passes through. The light from each LCD is recombined using a dichroic prism before going out the lens and on to a screen.
480i	480i is ATSC Standard Definition Television (SDTV) 720 x 480 or 640 x 480 interlaced video format where a frame of video is delivered in two fields. The first field contains the odd lines of the image and the second field contains the even lines. Each field is updated every 1/60th of a second resulting in 30 frames of video per second.
480p	480p is ATSC Enhanced Definition Television (EDTV) 720 x 480 progressive scan video format where a complete frame of video is delivered at either 30 or 24 frames per second. 480p also refers to a display format comprised of 854 x 480 pixels, 16 9 widescreen.
720p	720p is an ATSC high definition 1280 x 720 progressive scan video format where a complete frame of video is delivered at either 60, 30 or 24 frames per second.
802.11a	An IEEE specification for wireless networking that operates in the 5 GHz frequency range (5.725 GHz to 5.850 GHz) with a maximum 54 Mbps data transfer rate. The 5 GHz frequency band is not as crowded as the 2.4 GHz frequency, because the 802.11a specification offers more radio channels than the 802.11b. These additional channels can help avoid radio and microwave interference.
802.11b	International standard for wireless networking that operates in the 2.4 GHz frequency range (2.4 GHz to 2.4835 GHz) and provides a throughput of up to 11 Mbps. This is a very commonly used frequency. Microwave ovens, cordless phones, medical and scientific equipment, as well as Bluetooth devices, all work within the 2.4 GHz frequency band.
802.11g	Like the earlier 802.11b standard, it operates in the 2.4 GHz frequency range (2.4 GHz to 2.4835 GHz) but provides a throughput of up to 54 Mbps. Compatible with 802.11b devices at the 802.11b data speeds. Many other devices operate in the 2.4 GHz range where there is greater risk of interference. This can affect data throughput adversely.
8VSB	8 level Vestigial Side Band. Amplitude Modulated (AM) broadcast system developed to carry the MPEG 2 transport stream(s) of DTV at 19.2 Mbs. Uses the same 6MHz bandwidth as a normal channel does today but more efficiently.
AC	A form of electrical energy that uses alternating currents. More efficient than DC for carrying energy over long distances Accelerating anode Takes the electrons produced by a cathode and accelerates them before firing them at the back of a phosphor-coated screen
AC-3	Adaptive transform Coder 3, the bitstream designation of Dolby Digital. A variable, lossy audio compression method using perceptual coding to drop sound data you cannot hear. It can be used to deliver from 1 to 5.1 tracks of audio along with metadata on how best to play back a particular recording on a particular system. The '.1' track is a low frequency effects (LFE) track limited to 120 Hz. Metadata can offer control information on down-mixing, dynamic range and level normalization as well as informational data such as artist, copyright etc. The proper ATSC designation is presently A/52A. Encodes audio sampled at 32KHz, 44.1KHz and 48KHz into 32Kbps to 640Kbps data streams. Compression varies with quality with an average of 12 1.
Accelerating anode	Takes the electrons produced by a cathode and accelerates them before firing them at the back of a phosphor-coated screen Active-matrix LCD An LCD screen utilising TFT panels
Active Matrix	A common type of LCD used in laptops, cameras, and LCD projection panels that were produced in the late 1980s to early 1990s. Another name for it is thin-film transistor (TFT). A typical active matrix TFT display is a single panel of LCD glass that controls all three primary colors. TFT displays are noted for their quick response time and their ability to display full motion video and animations without image ghosting.
Active-matrix LCD	An LCD screen utilising TFT panels Anamorphic A true widescreen version of a film contains extra information on the disc that triggers a widescreen set into displaying a wider version of the picture compared to the standard 4 3 ratio picture
AES/EBU	Audio Engineering Society/European Broadcasting Union. Three pin XLR type connector used to send digital audio.
AGC Auto Gain Control.	A feature typically for VCRs that adjust incoming video levels to reasonable levels. Video copy protection routines fool this component into thinking the incoming video is too 'hot' which therefore causes the video to be extremely dim, sometimes to the point where you can’t see anything.
Amplitude Modulation	Amplitude Modulation (AM) is a method of transmitting information using varying signal levels on a non-varying carrier signal. The waveform of the information being sent exists in the difference of signal level between the peak of the first carrier wave to the peak of the next carrier wave and so on.