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

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

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

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

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

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

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

Page 186

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

Page 186

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.

Page 187

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

Page 188

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

Page 188

College of Computer and Information Science 7-13

Keyboard Entry (Page 2 of 2) Traditional Keyboard

Return

Page 189

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

Page 190

College of Computer and Information Science 7-15

Pointing Devices (Page 2 of 2)

• Joystick

• Touch Screen

• Light Pen

• Stylus

Page 191

Return

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

Page 192

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

Page 193

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

Page 194

Image Capturing Devices

College of Computer and Information Science 7-19

Webcams And Instant Messaging

• Exchange messages and files with friends

• Voice and video capabilities

• Application sharing

Page 196

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

Page 198

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

Page 198

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

Page 198

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)

Page 199

Return

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

Page 200

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

Page 201

Return

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

Page 203

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

Page 204

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

ReturnPage 215

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

Page 215

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.

Page 214

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.

Page 214

College of Computer and Information Science 7-32

End of Chapter 7