college of computer and information science chapter 7 input and output

College of Computer and Information Science

Chapter 7

Input and Output

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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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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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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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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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

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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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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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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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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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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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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Keyboard Entry (Page 2 of 2) Traditional Keyboard

Return

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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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Pointing Devices (Page 2 of 2)

• Joystick

• Touch Screen

• Light Pen

• Stylus

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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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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)

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• 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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Webcams And Instant Messaging

• Exchange messages and files with friends

• Voice and video capabilities

• Application sharing

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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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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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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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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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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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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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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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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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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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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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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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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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End of Chapter 7