| A B C D E F G H I J K L M N O P Q R S T U V W X Y Z |
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| 1080p |
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The number 1080 represents 1,080 lines of vertical display resolution, while the p stands for progressive scan or non-interlaced. 1080p is considered a high definition video mode.
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3 Top |
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| 3:2 Pull down |
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Film is usually recorded at 24 frames per second. NTSC video (North America) is 30 frames (60 fields) per second. In order to get smooth motion, the film frames are broken into video fields in a 3-2-3 sequence. 3 fields for the first film frame, 2 fields for the second film frame, and so on. If a line doubler doesn't compensate for the extra field during playback on a progressive-scan display, the image will have noticeable motion artefacts. A line doubler with 3:2 Pull down recognition can see this sequence in the signal and correct for it by making sure the last field in the first frame isn't mixed with the first field of the second frame
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4 Top |
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| 480p |
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480p is the short-hand name for a video display resolution. The p stands for progressive scan, i.e. non-interlaced, while 480 denotes a vertical resolution of 480 vertical scan lines, which is not high enough to qualify as high definition.
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A Top |
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| Aliasing |
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(1)Aliasing occurs when smooth curves and lines become rough or jagged because of a lower resolution device, or by an event. (2) In analog video, aliasing is typically caused by interference between the luma and chroma frequencies or between the chroma and field scanning frequencies. It appears as a moir or herringbone pattern, straight lines that become wavy, or rainbow colors. (3) In digital video, insufficient sampling or poor filtering of the signal causes aliasing. Defects typically appear as jagged edges on diagonal lines and twinkling or brightening in picture detail. |
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| Ambient Light |
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Light within the room or space coming from non-projector related sources (windows, overhead lights…etc.). The higher the Ambient Light present, the higher ANSI Lumen rated projector needed
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| Artifacts |
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Artifacts are visible corruption of the image or undesirable elements or defects in a video picture. These may occur naturally in the video process but must be eliminated to produce a high quality picture. The most common reasons for video artifacts are cross color and cross luma.
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| Auto Source |
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The ability of the projector to automatically recognize and synchronize to the horizontal and vertical scan frequencies of an input signal for proper display.
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B Top |
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| Bandwidth |
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The speed at which data can be sent across a network. LANs usually run at 10 or 100 million packets per second, which means that the data can be transferred at up to 100 million packets per second. A WAN usually transfers data at up to 1.5 to 45 million packets per second, but can go much faster.
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| Black level |
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More commonly referred to as "brightness", the black level is the level of light produced on a video screen. The level of a picture signal corresponding to the maximum limit of black peaks. The bottom portion of the video wave form, which contains the sync, blanking and control signals. The black level is set by the "brightness" control.
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| BNC |
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Bayonet Neill-Concelman. A cable connector used extensively in television and named for its inventor. A cylindrical bayonet connector that operates with a twist-locking motion. To make the connection, align the two curved grooves in the collar of the male connector with the two projections on the outside of the female collar, push and twist. This allows the connector to lock into place without the need for tools.
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C Top |
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| Carl Zeiss |
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Famed and renowned manufacturer of high quality lenses for cameras and projectors
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| Colour wheel |
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Colour wheels are used in DLP technology. A wheel through which light passes, turning the light to different colours alternately. The speed at which the alternate colours are displayed results in a full colour image being perceived by the brain. A faster Colour wheel or one with a higher number of colour segments results in less 'rainbox effect' - a break-up of colours perceived by some people as the eye moves. |
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| Component Video |
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Component Video is a type of analog video information that is transmitted or stored as two or more separate signals (red, green, blue). Component Video can be contrasted with Composite video in which all the video information is combined into a single signal such as a TV broadcast. Currently, Component Video connections are gradually being superseded by the higher quality digital DVI and HDMI interface.
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| Composite video |
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An all-in-one video signal - lowest video quality
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| Connectivity |
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Refers to the input and output ports and wireless ability of the product
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| Contrast Ratio |
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The measurement of the difference in light intensity between the brightest white and the darkest black. Higher Contrast Ratios generally result in richer images, and are particularly preferable for home cinema use.
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D Top |
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| DDR SDRAM |
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DDR SDRAM is an evolutionary next-generation memory built upon the stable architecture of current PC100/PC133 technology. DDR SDRAM activates output on both the rising and falling edge of the bus clock. By performing 2 operations per clock cycle, DDR SDRAM effectively doubles the memory bandwidth of its single rate counterpart. PC1600 DDR DIMMs run at a clock rate of 100MHz (like PC100) with an effective data rate of 200MHz. PC2100 DDR DIMMs run at a clock rate of 133MHz (like PC133) with an effective data rate of 266MHz. All Christie FRC-5000 display wall controllers include PC2100 DDR SDRAM.
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| Decoder |
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A device used to separate the RGBS (red, green, blue and sync) signals from a Composite video signal.
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| DVD |
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Digital Versatile Disc. Same physical size as a compact disc but has a capacity to hold a minimum of 4.7GB of data, 9.4GB if dual layer and/or dual sided. DVD-Video discs can hold about 4 hours of video on a dual layer disc depending upon the amount of compression applied. It uses MPEG-2 compression at a maximum rate of 9.2 Mbps with most video compressed at about 4Mbps at 720x480 pixels. All players support AC-3 (Dolby Digital), PCM, and MPEG-2 audio with up to 8 separate tracks. DTS is usually supported but isn't mandatory to the format. DVD-Audio supports up to 6 channels of 24 bit, 192KHz sampled PCM audio.
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| DVI-D |
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A variant of the DVI (Digital Video Interface) connnection standard. DVI is a very high quality, digital connection which is typically found in higher-end PCs designed for high quality graphics, and Apple Macs. It can be found in some home cinema projectors but HDMI is now becoming a more common standard for this market as it also carries audio.
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E Top |
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| Eco-mode |
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A menu function to extend Lamp life and reduce energy consumption by slightly reducing brightness. Typically a 20% reduction in brightness can increase Lamp life by up to 50 per cent
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H Top |
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| HDCP |
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High-Bandwidth Digital Content Protection. Created by Intel, HDCP is used with HDTV signals over DVI and HDMI connections to prevent unauthorised duplication of copywritten material.
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| HDMI |
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High-Definition Multimedia Interface. A modern, digital connection that carries both video and audio signals. Effectively replaces the old SCART connection in a more compact, higher definition format.
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| High Gain Projection Screen |
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Material that reflects more light than matte material. Increases a projector's light output at the expense of uniformity.
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I Top |
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| I/O |
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Input / Output
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| Infra Red Remote |
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An infra-red (IR) remote control transmits in the spectrum of infra-red light, such as a television remote. Unlike RF remotes, IR remotes must point at the receiver (line of sight). Typical range is limited to 30 feet including the distance to and from reflected surfaces. For example, if you are controlling a projector and you point the remote at the screen which is 12 feet from you and the projector is 10 feet, the total distance is 22 feet. Most projectors have a IR sensor in both the front and rear of the projector, whereas, flatscreens generally have a single IR sensor in the front of the unit. When working at or near the maximum distance, pointing right at the receiver is necessary. IR remotes must have clear path or reflected path to the receiver to operate.
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| Inter-Connects |
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Any cable or wire running between two pieces of A/V equipment. For example, RCA terminated cables connecting pre/pros and amps.
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| Interlaced |
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Process of alternating scan lines to create a complete image. In CRT displays, every second field/frame is scanned between the first field/frame. The first field represents the odd lines; the second field represents the even lines. The fields are aligned and timed so that, with a still image, the human eye blurs the two fields together and sees them as one. Interlace scanning allows only half the lines to be transmitted and presented at any given moment. A 1080i HD signal transmits and displays only 540 lines per 60th of a second. 480i NTSC transmits and displays only 240 lines per 60th of a second. Motion in the image can make the fields noticeable. Interlaced images have motion artefacts when two fields don't match to create the complete frame, often most noticeable in film-based material.
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| Interlacing |
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A video frame is made up of two fields. Interlacing is the process of scanning the picture onto a video screen whereby the lines of one scanned field fall evenly between the lines of the preceding field
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K Top |
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| Keystone Correction |
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Keystone Correction makes a projected image rectangular. This can be accomplished by positioning the projector to be perpendicular to the screen. Since this is not always possible, most projectors are equipped with Keystone Correction that allows the image to be keystone corrected (made rectangular) by adjusting optics, making mechanical adjustments, or applying digital scaling to the image. Keystone Correction can be one or two dimensional and manual or automatic depending on the projector and the manufacturer. Be aware that digital scaling will introduce some artifacts that are more evident when viewing small text and less evident in presentation type material or video.
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L Top |
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| Lamp life |
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| LCD |
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Liquid Crystal Display. A display that consists of two polarising transparent panels and a liquid crystal surface sandwiched in between. Voltage is applied to certain areas, causing the crystal to turn dark. A light source behind the panel transmits through transparent crystals and is mostly blocked by dark crystals.
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| Lens Shift |
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Displacement of the lens with the prism (horizontal or vertical) or vice versa, resulting in the center of the image being offset from the center of the lens. Lens Shift is used to help eliminate key-stoned images and geometrically align images when multiple projectors are used simultaneously.
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M Top |
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| Monitor Loop-through |
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A feature that allows the video signal to be passed through a device relatively unprocessed and sent to a local monitor or other device. The loop-through is separate from the circuits that process a signal for output to the main presentation or recording device
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O Top |
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P Top |
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R Top |
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| Rainbow effect |
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A visual effect sometimes evident when viewing a display that uses DLP technology. Rapid eye movement results in the viewer seeing a rainbow-like blur in the image, particularly with high contrast images. This effect is reduced in projectors with faster Colour wheels, a higher number of Colour wheel segments, or multiple DLP chips.
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| RJ45 |
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A connector typically used for networking computers and networkable devices.
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S Top |
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| SCART |
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Analogue AV connection used commonly across Europe, especially with televisions and DVD players but less commonly with projectors. An advantage of SCART is that it carries both video and audio in one cable. SCART will be overtaken in popularity by its digital equivalent, HDMI.
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| SVGA |
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The projected image is made up of 800 x 600 pixels.
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| SXGA |
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The projected image is made up of 1280 x 1024 pixels
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| SXRD |
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Silicon X-tal Reflective Display : panels with rapid 5msec response time
and over 6 Million pixels with narrow spacing and high density - no screen door effect
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U Top |
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| UXGA |
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The projected image is made up of 1600 x 1200 pixels
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W Top |
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| WUXGA |
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The projected image is made up of 1920 x 1200 pixels
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X Top |
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| XGA |
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The projected image is made up of 1024 x 768 pixels
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Y Top |
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Z Top |