Project work ofcomputer science Topic of project-Output device
Output deviceAn output device is any piece of computer hardwareequipment used to communicate the results of dataprocessing carried out by an information processingsystem (such as a computer) which converts theelectronically generated information into human-readable form
Types of outputSome types of output are text, graphics, tactile, audio, andvideo. Text consists of characters(letters, numbers, punctuation marks, or any other symbolrequiring one byte of computer storage space) that areused to create words, sentences, and paragraphs. Graphicsare digital representations of nontext information such asdrawings, charts, photographs, and animation (a series ofstill images in rapid sequence that gives the illusion ofmotion). Tactile output such as raised line drawings may beuseful for some individuals who are blind. Audio ismusic, speech, or any other sound. Video consists ofimages played back at speeds to provide the appearanceof full motion
AudioSpeech output systems can be used to read screentext to computer users. Special software programscalled screen readers attempt to identify andinterpret what is being displayed on the screen
Computer speakerComputer speakers, or multimedia speakers, are speakers externalto a computer, that disable the lower fidelity built-in speaker. Theyoften have a low-power internal amplifier. The standard audioconnection is a 3.5 mm (approximately 1/8 inch) stereo jack plugoften color-coded lime green (following the PC 99 standard) forcomputer sound cards. A plug and socket for a two-wire (signal andground) coaxial cable is widely used to connect analog audio andvideo components. Rows of RCA sockets are found on the backs ofstereo amplifier and numerous A/V products. The prong is 1/8" thickby 5/16" long. A few use an RCA connector for input. There are alsoUSB speakers which are powered from the 5 volts at 500 milliampsprovided by the USB port, allowing about 2.5 watts of output power
HeadphonesHeadphones are a pair of small loudspeakers whichare designed to be held in place close to a users ears.Headphones have wires which allow them to beconnected to a signal source such as an audioamplifier, radio, CD player, or portable media player.They are also known as stereophones or, colloquially,cans. The in-ear versions are known as earphones orearbuds. In the context of telecommunication, theterm headset is used to describe a combination ofheadphone and microphone.
Computer monitorA monitor or display (also called screen or visualdisplay unit) is an electronic visual display forcomputers. The monitor comprises the display device,circuitry, and an enclosure. The display device inmodern monitors is typically a thin film transistorliquid crystal display (TFT-LCD) thin panel, while oldermonitors use a cathode ray tube (CRT) about as deepas the screen size.
Originally, computer monitors were used for dataprocessing while television receivers were used forentertainment. From the 1980s onwards, computers(and their monitors) have been used for both dataprocessing and entertainment, while televisions haveimplemented some computer functionality. Thecommon aspect ratio of televisions, and thencomputer monitors, has also changed from 4:3 to 16:9(and 16:10).
projectorImage projector, a device that projects an image on asurfaceVideo projector, a device that projects a video signal fromcomputer, home theater system etc.Movie projector, a device that projects moving picturesfrom a filmstripSlide projector, a device that projects a still image with atransparent baseOverhead projector, a device that projects a transparentimage
Opaque projector, a predecessor to the overhead projectorPlanetarium projector, a device that projects images of skyobjectsMagic lantern (projector), a historic projection deviceCamera obscura, the historic ancestor to projection devicesEnlarger, a device used to produce photographic prints fromnegativesCeiling projector, a device used to measure the height of cloudsProjection (linear algebra), a linear transformation of a vectorspace
PrinterIn computing, a printer is a peripheral which produces atext or graphics of documents stored in electronic form,usually on physical print media such as paper ortransparencies. Many printers are primarily used as localperipherals, and are attached by a printer cable or, in mostnew printers, a USB cable to a computer which serves as adocument source. Some printers, commonly known asnetwork printers, have built-in network interfaces, typicallywireless or Ethernet based, and can serve as a hard copydevice for any user on the network. Individual printers areoften designed to support both local and networkconnected users at the same time
. In addition, a few modern printers can directlyinterface to electronic media such as memory cards,or to image capture devices such as digital camerasand scanners; some printers are combined withscanners or fax machines in a single unit, and canfunction as photocopiers. Printers that include non-printing features are sometimes called multifunctionprinters (MFP), multi-function devices (MFD), or all-in-one (AIO) printers. Most MFPs include printing,scanning, and copying among their many features.