Computer Confluence 6/e Chapter 3 Output: From Pulses to PeopleSlide 2Slide 4Slide 5Slide 6Slide 7Slide 8Slide 9Slide 10Slide 11© 2005 Prentice-Hall, Inc. Slide 1Computer Confluence 6/e Chapter 3Output: From Pulses to PeopleScreen OutputA monitor or video display terminal (VDT) displays characters, graphics, photographic images, animation and videoVideo adapter—connects the monitor to the computerVRAM or video memory—a special portion of RAM to hold video images the more video memory, the more picture detail is displayed© 2005 Prentice-Hall, Inc. Slide 2Computer Confluence 6/e Chapter 3Output: From Pulses to PeopleMonitor size: Measured as a diagonal line across the screenResolution: The number of pixels displayed on the screen Pixels (or picture elements): tiny dots that compose a pictureThe higher the resolution, the closer together the dotsImage quality is affected by resolution and color depth (or bit depth)Color depth refers to the number of different colors a monitor displays at one time© 2005 Prentice-Hall, Inc. Slide 4Computer Confluence 6/e Chapter 3Output: From Pulses to PeopleMonitor classesCRTs (cathode-ray tubes) LCDs (liquid crystal displays) are now more popular  Overhead projection panels  Video projectors Portable computers© 2005 Prentice-Hall, Inc. Slide 5Computer Confluence 6/e Chapter 3Output: From Pulses to PeoplePaper OutputPrinters produce paper output or hard copy Two basic groups of printers:Impact printersLine printers Dot-matrix printers© 2005 Prentice-Hall, Inc. Slide 6Computer Confluence 6/e Chapter 3Output: From Pulses to PeopleNon-impact printersLaser printersLaser beam reflected off a rotating drum to create patterns of electrical chargesFaster and more expensive than dot matrix printerHigh-resolution outputInkjet printers Sprays ink onto paper to produce printed text and graphic imagesPrints fewer pages/minute than laser printerHigh-quality color costing less than laser printer© 2005 Prentice-Hall, Inc. Slide 7Computer Confluence 6/e Chapter 3Output: From Pulses to PeopleMultifunction printer or MFP combines a scanner, printer and a fax modemPlotter: can produce large, finely scaled engineering blueprints and maps© 2005 Prentice-Hall, Inc. Slide 8Computer Confluence 6/e Chapter 3Output: From Pulses to PeopleFax Machines and Fax ModemsFacsimile (fax) machine Sending: fax machine scans each page, converts the scanned image into a series of electronic pulses and sends those signals over phone lines to another fax machine Receiving: fax machine uses the signals to construct and print black-and-white facsimiles or copies of the original pages Fax modem Translates the document into signals that can be sent over phone wires and decoded by the receiving fax machine© 2005 Prentice-Hall, Inc. Slide 9Computer Confluence 6/e Chapter 3Output: From Pulses to PeopleOutput You Can HearSound card  Enables the PC to:Accept microphone inputPlay music and other sound through speakers or headphonesProcess sound in a variety of waysSynthesizers Used to produce music, noise© 2005 Prentice-Hall, Inc. Slide 10Computer Confluence 6/e Chapter 3Output: From Pulses to PeopleControlling Other MachinesOutput devices take bit patterns and turn them into non-digital movementsRobot armsTelephone switchboardsTransportation devicesAutomated factory equipmentSpacecraftForce feedback joystick© 2005 Prentice-Hall, Inc. Slide 11Computer Confluence 6/e Chapter 3Output: From Pulses to PeopleRules of Thumb: Ergonomics and HealthChoose equipment that’s ergonomically designedCreate a healthy workspaceBuild flexibility into your work environmentRest your eyesStretch to loosen tight musclesListen to your bodySeek help when you need