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College of Computer and Information Science
Chapter 7
Input and Output
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College of Computer and Information Science 7-2
Key Words & Terms• active matrix monitor: 主动矩阵监视器• bar code: 条形码• bar code reader: 条形码读码器 • bar code scanner: 条形码扫描仪• cathode ray tube monitor (CRT): 阴极射线管监视器• clarity: 清晰度• combination key: 组合键• cordless mouse: 无线鼠标• data projector: 数字投影仪• digital camera: 数字相机• digital media player: 数字媒体播放器• digital music player: 数字音乐播放器• digital video camera: 数字摄像机• display screen: 显示屏• dot-matrix printer: 点阵式打印机
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College of Computer and Information Science 7-3
Key Words & Terms• dot pitch: 点距• dots-per-inch (dpi): 每英寸点数• dual-scan monitor: 整体扫描显示器• dumb terminal: 哑终端• e-book: 电子图书• ergonomic keyboard: 保健键盘• fax (facsimile) machine: 传真机• flat-panel monitor: 平板显示器• flatbed scanner: 平板式扫描仪• flexible keyboard: 便携式键盘• handwriting recognition software: 手写识别软件• Headphones: 耳机• high-definition television (HDTV): 高清电视• ink-jet printer: 喷墨式打印机• intelligent terminal: 智能终端• Internet telephone: 网络电话• Internet telephony: 网络电话传输
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College of Computer and Information Science 7-4
Key Words & Terms• IP Telephony: 网络电话传输• joystick: 游戏杆• keyboard: 键盘• laser printer: 激光打印机• light pen: 光笔• liquid crystal display (LCD): 液晶显示器• magnetic card reader: 磁卡读卡机• Magnetic-ink character recognition (MICR): 磁墨符号
识别• mechanical mouse: 机械鼠标• monitor: 监视器• mouse: 鼠标• mouse pointer: 鼠标指针• multifunction device (MFD): 多功能设备• network terminal: 网络终端
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College of Computer and Information Science 7-5
Key Words & Terms• multifunction device (MFD): 多功能设备• network terminal: 网络终端• numeric keypad: 数字键区• optical character recognition (OCR): 光学符号识别• optical-mark recognition (OMR): 光学标记识别• optical mouse: 光电鼠标• optical scanner: 光学扫描仪• passive-matrix monitor: 被动矩阵监视器• PDA keyboard: PDA 键盘• personal laser printer: 个人激光打印机• photo printer: 照片打印机• pixel (picture element): 象素• pixel pitch: 象素点距• platform scanner: 平板扫描仪• plotter: 绘图仪• pointing stick: 点击杆• portable printer: 便携式打印机
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College of Computer and Information Science 7-6
Key Words & Terms• portable scanner: 便携式扫描仪• printer: 打印机• radio frequency card reader: 无线电频卡读卡机• radio frequency identification (RFID) :无线电频识别• refresh rate: 刷新率• resolution: 分辨率• roller ball: 滚动球• shared laser printer: 共享式激光打印机• speakers: 扬声器• stylus: 尖笔(用于输入)• technical writer: 技术文档制作者• telephony: 电话学,电话传输• terminal: 终端• thermal printer: 热感式打印机• thin client: 网络终端
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College of Computer and Information Science 7-7
Key Words & Terms• thin film transistor monitor (TFT): 主动矩阵显示器• toggle key: 触发键• touch pad: 触摸板• touch screen: 触摸屏• trackball: 轨迹球• traditional keyboard: 传统键盘• Universal Product Code (UPC): 通用产品代码• voice-over IP (VoIP): 网络电话传输• voice recognition system: 语音识别系统• wand reader: 条形码识别器• WebCam: 网络摄像机• wheel button: (鼠标)滚轮• wireless mouse: 无线鼠标
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College of Computer and Information Science 7-8
Competencies (Page 1 of 2)
• Define input• Describe keyboard entry, pointing devices, and
scanning devices• Discuss image capturing devices, including digital
cameras, digital video cameras, and audio input devices
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College of Computer and Information Science 7-9
Competencies (Page 2 of 2)
• Define output• Describe monitors, printers, and audio output
devices• Discuss combination input and output devices,
including fax machines, multifunctional devices, Internet telephones, and terminals
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College of Computer and Information Science 7-10
Introduction
Do you ever wonder how information gets into your computer and comes out in a form you can use? Input devices convert what we understand into what the system unit can process. Output devices convert what the system unit has processed into a form that we can understand. Input and output devices are the focus of this chapter.
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College of Computer and Information Science 7-11
What is Input?
• Any data or instructions used by a computer• Input devices
– Hardware• Keyboards• Pointing devices• Scanning devices• Other devices
– Translates data into a form that the system unit can process
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College of Computer and Information Science 7-12
Keyboard Entry (Page 1 of 2)
• Keyboards– Traditional keyboards– Flexible keyboards– Ergonomic keyboards– Wireless keyboards– PDA keyboards
• Features– Typewriter keyboard with numeric keypad– Special purpose keys
• Toggle and combination keys
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College of Computer and Information Science 7-13
Keyboard Entry (Page 2 of 2) Traditional Keyboard
Return
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College of Computer and Information Science 7-14
Pointing Devices (Page 1 of 2)
• Mice– Mechanical– Optical – Cordless
or wireless
• Three similar devices to mice– Trackball– Touch pads– Pointing stick
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College of Computer and Information Science 7-15
Pointing Devices (Page 2 of 2)
• Joystick
• Touch Screen
• Light Pen
• Stylus
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Return
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College of Computer and Information Science 7-16
Scanning Devices (Page 1 of 2)
• Optical scanners– Flatbed scanners– Portable scanners
• Card Readers– Magnetic card readers– Radio Frequency card readers
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College of Computer and Information Science 7-17
Scanning Devices (Page 2 of 2) • Bar code readers
– Handheld wand readers or platform scanners
– Contain photoelectric cells that read bar codes • Character and mark recognition devices
– Magnetic ink character recognition (MICR)– Optical-character recognition (OCR)– Optical-mark recognition (OMR)
Return
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College of Computer and Information Science 7-18
• Digital cameras– Images recorded digitally on a disk – Images can be downloaded to a computer
• Digital video cameras– Records motion digitally – Can take still images as well– WebCams
• Specialized digital video cameras• Broadcast images over the Internet
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Image Capturing Devices
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College of Computer and Information Science 7-19
Webcams And Instant Messaging
• Exchange messages and files with friends
• Voice and video capabilities
• Application sharing
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College of Computer and Information Science 7-20
Audio-Input Devices
• Voice recognition systems– Use a microphone, a
sound card, and special software
– Users can operate computers and create documents using voice commands
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College of Computer and Information Science 7-21
What is Output?
• Processed data or information• Types of output
– Text– Graphics/Photos– Audio & video
• Output devices– Monitors– Printers– Other Devices
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College of Computer and Information Science 7-22
Monitors (Page 1 of 2)
• Known as screens or display screens• Output referred to as soft copy • Features
– Resolution/pixels– Dot pitch– Refresh rate– Size
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College of Computer and Information Science 7-23
Monitors (Page 2 of 2)
• Cathode-ray tube (CRT) monitors• Flat-panel monitors
– Require less power to operate– Portable and thinner than CRTs
• Other monitors– E-books– Data projectors– High-definition television (HDTV)
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College of Computer and Information Science 7-24
Printers (Page 1 of 2)
• Translates information that has been processed by the system unit
• Output referred to as hard copy• Features
– Resolution– Color capability– Speed– Memory
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College of Computer and Information Science 7-25
Printers (Page 2 of 2)
• Ink-jet printer • Laser printer
– Personal laser printers
– Shared laser printers • Thermal printer• Other printers
– Dot-matrix printers– Plotters– Photo printers– Portable printers
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College of Computer and Information Science 7-26
Audio-Output Devices
• Translates audio information from the computer into sounds that people can understand
• Common devices– Speakers– Headphones
• Digital Music Players– iPod– iRiver
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College of Computer and Information Science 7-27
Multifunctional Devices (MFD)
• Many devices combine input and output capabilities and offer cost and space advantages
• Fax machines• Internet telephones
– known as Internet telephony– IP telephony– and Voice-over IP (VoIP)– Three approaches
• Terminals
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College of Computer and Information Science 7-28
Internet Telephone Approaches• Computer-to computer
– Free long distance calls– Requires computers to be connected to the Internet– MSN is most widely used software
• Computer-to traditional telephone– Place the call from a computer to a phone – Requires an Internet phone service provider
• Software requirements• Small monthly and/or per-minute fee
• Traditional telephone-to-traditional telephone– Does not require a computer– Subscription required to a special Internet phone service provider
• Special hardware adapter• Cost is similar to the computer-to-traditional telephone approach
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College of Computer and Information Science 7-29
Terminals
• An input and output device• Connects to a mainframe or server• Types of terminals
– Dumb terminal – Intelligent terminal– Network terminal
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College of Computer and Information Science 7-30
Discussion Questions (Page 1 of 2)
• Define input and input devices.• Describe the different types of pointing,
scanning, image capturing, and audio-input devices.
• Describe the three categories of output devices.
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College of Computer and Information Science 7-31
Discussion Questions (Page 2 of 2)
• Define output and output devices.• What are combination input and output
devices? Describe four such devices.
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College of Computer and Information Science 7-32
End of Chapter 7