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Input: From Person to Processor Input: From Person to Processor Input: From Person to Processor Output: From Pulses to People Output: From Pulses to People Output: From Pulses to People

Slide 12

Chapter 3 Input: From Person to Processor

Audio digitizers Digitize sounds from  Microphones  Other input devices Digital signals can be  Stored  Further processed with specialized software  A digital signal processing chip compresses the stream of bits before it is transmitted to the CPU © 2006 Prentice-Hall, Inc. Slide 13

Chapter 3 Input: From Person to Processor

Speech recognition software Converts voice data into words that can be edited and printed © 2006 Prentice-Hall, Inc. Slide 14

Chapter 3 Input: From Person to Processor

Sensors Designed to monitor physical conditions  Temperature, humidity, pressure Provide data used in:  Robotics  Environmental climate control  Weather forecasting  Medical monitoring  Biofeedback  Scientific research © 2006 Prentice-Hall, Inc. Slide 15

Chapter 3 Output: From Pulses to People

Screen 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 © 2006 Prentice-Hall, Inc. Slide 16

Chapter 3 Output: 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 © 2006 Prentice-Hall, Inc. Slide 18

Chapter 3 Output: 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 © 2006 Prentice-Hall, Inc. Slide 19

Chapter 3 Output: From Pulses to People

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