Dell M409WX User Manual

Also see for M409WX: Specification sheet User guide User guide

42 GlossarydB— decibel—A unit used to express relative difference in power or intensity,usually between two acoustic or electric signals, equal to ten times the commonlogarithm of the ratio of the two levels.Diagonal Screen— A method of measuring the size of a screen or a projectedimage. It measures from one corner to the opposite corner. A 9FT high, 12FTwide, screen has a diagonal of 15FT. This document assumes that the diagonaldimensions are for the traditional 4:3 ratio of a computer image as per the exampleabove.DLP ®— Digital Light Processing™—Reflective display technology developed byTexas Instruments, using small manipulated mirrors. Light passes through a colorfilter is sent to the DLP mirrors which arrange the RGB colors into a pictureprojected onto screen, also known as DMD.DMD— digital Micro- Mirror Device— Each DMD consists of thousands oftilting, microscopic aluminum alloy mirrors mounted on a hidden yoke.Focal Length— The distance from the surface of a lens to its focal point.Frequency— It is the rate of repetition in cycles per seconds of electrical signals.Measured in Hz.HDMI— High Definition Multimedia Interface, carry both uncompressed highdefinition video along with digital audio and device control data in a singleconnector.Hz — Hertz, unit of frequency.Keystone Correction— Device that will correct an image of the distortion(usually a wide-top narrow-bottom effect) of a projected image caused byimproper projector to screen angle.Laser pointer— A small pen or cigar sized pointer that contains small batterypowered laser, which can project small, red (typically), highly intensity beam oflight that is immediately very visible on the screenMaximum Distance— The distance from a screen the projector can be to cast animage that is useable (bright enough) in a fully darkened room.Maximum Image Size— The largest image a projector can throw in a darkenedroom. This is usually limited by focal range of the optics.Minimum Distance— The closest position that a projector can focus an imageonto a screen.NTSC— National Television Standards Committee. North American standard forvideo and broadcasting, with a video format of 525 lines at 30 frames per second.PAL— Phase Alternating Line. A European broadcast standard for video andbroadcasting, with a video format of 625 lines at 25 frames per second.http://www.pureglare.com.au

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