Chapter 5 Input and Output

Chapter 5 Objectives List the characteristics of a keyboard Summarize how these pointing devices work: mouse, trackball, touchpad, pointing stick, joystick, wheel, light pen, touch screen, stylus, and digital pen Describe other types of input, including voice input; input devices for PDAs, Tablet PCs, and smart phones; digital cameras; voice input; scanners and reading devices; terminals; and biometric input Describe the characteristics of CRT monitors, LCD monitors, and LCD screens Summarize the various types of printers Explain the characteristics of speakers and headsets, fax machines and fax modems, multifunction peripherals, and data projectors Identify input and output options for physically challenged users Next

What Is Input? What is input? p. 156 Fig. 5-1 Next  Input device is any hardware component used to enter data or instructions  Data or instructions entered into memory of computer

Keyboard and Pointing Devices What is a keyboard? p. 157 Fig. 5-2 Next  Input device containing keys users press to enter data into a computer  Includes typing area, numeric keypad, and function keys  Can be cordless or built-in

Keyboard and Pointing Devices How do you use a mouse? p. 158 Fig. 5-3 Next Step 1. Place the mouse toward the right of the mouse pad. Step 2. Move the mouse diagonally toward the left until the pointer is positioned on the Microsoft Outlook icon.  As you move mouse, pointer on screen moves

Keyboard and Pointing Devices What is a mouse? p. 158 Fig. 5-4a Next  Pointing device that fits under palm of hand  Pointing device controls movement of pointer, also called mouse pointer  Mechanical mouse has rubber or metal ball on underside mouse buttons wheel button mouse pad ball Click to view Web Link, click Chapter 5, Click Web Link from left navigation, then click Mouse below Chapter 5

Keyboard and Pointing Devices What is an optical mouse? p. 159 Fig. 5-4b Next  No moving mechanical parts inside  Senses light to detect mouse’s movement  More precise than mechanical mouse  Connects using a cable, or wireless

Keyboard and Pointing Devices What is a trackball? p. 159 Fig. 5-5 Next  Stationary pointing device with a ball on its top  To move pointer, rotate ball with thumb, fingers, or palm of hand

Keyboard and Pointing Devices What are a touchpad and a pointing stick? p. 160 Figs. 5-6—5-7 Next  Touchpad is small, flat, rectangular pointing device sensitive to pressure and motion  Pointing stick is pointing device shaped like pencil eraser positioned between keys on keyboard

Keyboard and Pointing Devices What are a joystick and a wheel? p. 160 Fig. 5-8 Next  Joystick is vertical lever mounted on a base  Wheel is steering-wheel-type input device  Pedal simulates car brakes and accelerator

Keyboard and Pointing Devices What is a light pen? p. 161 Fig. 5-9 Next  Handheld input device that can detect light  Press light pen against screen surface and then press button on pen

Keyboard and Pointing Devices What is a touch screen? p. 161 Fig Next  Touch areas of screen with finger  Often used with kiosks

Keyboard and Pointing Devices What is a stylus and a digital pen? p. 161 Fig Next  Looks like a ballpoint pen, but uses pressure to write text and draw lines  Used with graphics tablets, flat electronic boards Click to view Web Link, click Chapter 5, Click Web Link from left navigation, then click Stylus and Pen below Chapter 5

Other Input Devices What is voice input?  Entering data by speaking into a microphone  Voice recognition or speech recognition is the computer’s capability to distinguish spoken words p. 163 Next Click to view Web Link, click Chapter 5, Click Web Link from left navigation, then click Voice Input below Chapter 5

Other Input Devices p. 163 Fig Next What is audio input?  Entering sounds into a computer - speech, music, and sound effects  MIDI - standard defining how digital musical devices represent sound electronically

Other Input Devices How is a data entered into a PDA? p. 164 Fig Next

Other Input Devices What is a docking station? p. 165 Fig Next  External device that holds mobile computer  Provides connections to peripherals

Other Input Devices What is a smart phone? p. 165 Next  Users can input and send text messages, graphics, pictures, video clips, and sound files

Other Input Devices What is a digital camera? p. 165 Fig Next  Allows you to take digital pictures  Images viewable immediately on camera  Download to computer  Post pictures to Web

Other Input Devices What is resolution? p. 165 Next  Sharpness and clarity of image  The higher the resolution, the better the image quality, but the more expensive the camera  Pixel (picture element) is single point in electronic image  Greater the number of pixels, the better the image quality

Other Input Devices What is video input? p. 166 Next  Process of entering full-motion images into computer  Digital video (DV) camera records video as digital signals

Other Input Devices What are a PC video camera and a Web cam? p. 166 Fig Next  PC video camera c — c DV camera used to capture video and still images, and to make video telephone calls on Internet  Also called PC camera  Web cam c — c video camera whose output displays on a Web page Click to view video

Other Input Devices What is video conferencing? p. 166 Fig Next  Two or more geographically separated people who use network on Internet to transmit audio and video data

Other Input Devices What is a scanner? p. 167 Fig Next  Light-sensing device that reads printed text and graphics  Used for image processing, converting paper documents into electronic images Click to view animation Click to view Web Link, click Chapter 5, Click Web Link from left navigation, then click Scanners below Chapter 5

Other Input Devices What is an optical reader? p. 167 Fig Next  Optical character recognition (OCR) reads characters in OCR font  Optical mark recognition (OMR) reads hand- drawn pencil marks, such as small circles  Bar code reader  Device that uses light source to read characters, marks, and codes and then converts them into digital data

Other Input Devices What is a turnaround document? p. 167 Fig Next  Document that you return to the company that sent it  Portion you return has information printed in OCR characters

What is a magnetic-ink character recognition (MICR) reader? Other Input Devices p. 168 Fig Next  Can read text printed with magnetized ink  Banking industry almost exclusively uses MICR for check processing

Other Input Devices What is a point of sale (POS) terminal? p. 169 Fig Next  Records purchases, processes credit or debit cards, and updates inventory  Swipe credit or debit card through card reader c — c reads customer’s personal data from magnetic strip

Other Input Devices What is an automated teller machine (ATM)? p. 170 Fig Next  Self-service banking machine that connects to a host computer through a network What is a smart display?  Thin monitor that detaches from computer to function as portable wireless touch screen

Other Input Devices What is biometrics? p. 170 Fig Next  Authenticates person’s identity by verifying personal characteristic  Fingerprint scanner captures curves and indentations of fingerprint  Hand geometry system measures shape and size of person’s hand Click to view video Click to view Web Link, click Chapter 5, Click Web Link from left navigation, then click Biometric Input below Chapter 5

Other Input Devices What are examples of biometric technology? p. 171 Fig Next  Voice verification system compares live speech with stored voice pattern  Signature verification system recognizes shape of signature  Iris recognition system reads patterns in blood vessels in back of eye  Biometric data is sometimes stored on smart card, which stores personal data on microprocessor embedded in card

What is Output? What is output? p. 172 Fig Next  Data that has been processed into a useful form, called information  Output device is any hardware component that can convey information to user

Display Devices What is a display device? p. 173 Next  Output device that visually conveys information  Information on display device sometimes called soft copy  Monitor houses display device as separate peripheral

Display Devices What is a CRT monitor? p. 174 Fig Next  Contains cathode-ray tube (CRT)  Screen coated with tiny dots of phosphor material  Each dot consists of a red, blue, and green phosphor  Common sizes are 15, 17, 19, 21, and 22 inches  Viewable size is diagonal measurement of actual viewing area

Display Devices What is resolution? p. 174  Sharpness and clarity of image  Refresh rate is speed at which monitor redraws images on screen  Higher resolution makes image sharper, displays more text on screen, makes some elements smaller Next

Display Devices How does video travel from the processor to a CRT monitor? p. 175 Fig Next Step 1. The processor sends digital video data to the video card. Step 2. The video card’s digital-to-analog converter (DAC) converts the digital video data to an analog signal. Step 3. The analog signal is sent through a cable to the CRT monitor. Step 4. The CRT monitor separates the analog signal into red, green, and blue signals. Step 5. Electron guns fire the three color signals to the front of the CRT. Step 6. An image is displayed on the screen when the electrons hit phosphor dots on the back of the screen.  Video card (also called a graphics card) converts digital output from computer into analog video signal

Display Devices What is a flat panel display? p. 176 Fig Next  Uses liquid crystal display  Also called LCD monitor  Consumes less than one-third the power  Mobile devices that contain LCD displays include  Notebook computer, Tablet PC, PDA, and Smart Phone Click to view Web Link, click Chapter 5, Click Web Link from left navigation, then click LCD Technology below Chapter 5

Display Devices What is a gas plasma monitor? p. 177 Fig Next  Displays image by applying voltage to layer of gas  Larger screen size and higher display quality than LCD, but much more expensive

Printers What is a printer? p. 177 Fig Next  Output device that produces text and graphics on paper  Purchasing a printer Click to view animation

Printers What is an impact printer? p. 178 Fig Next  Forms characters by striking mechanism against inked ribbon that contacts paper  Dot-matrix printer produces printed images when tiny wire pins strike ribbon  Line printer prints entire line at a time

Printers What is a nonimpact printer? p. 178 Fig Next  Forms characters and graphics without striking paper  Ink-jet printer sprays tiny drops of liquid ink onto paper  Prints in black-and-white or color on a variety of paper types Click to view Web Link, click Chapter 5, Click Web Link from left navigation, then click Ink-Jet Printers below Chapter 5

Printers What is a photo printer? p. 180 Fig Next Step 2. Insert media card into card reader on photo printer. Step 3. Use menu to select desired image to print, view it on LCD screen, edit if necessary, select size of the print, and then print image. Step 4. Remove printed photo from the printer.  Color printer that produces photo-lab-quality pictures media cards photo printer Click to view video Step 1. Take photograph with digital camera and store it on media card in the camera. media card

Printers What is a laser printer? p. 181 Fig Next  High-speed, high-quality nonimpact printer Click to view Web Link, click Chapter 5, Click Web Link from left navigation, then click Laser Printers below Chapter 5  Prints text and graphics in very high-quality resolution, ranging from 600 to 2,400 dpi  Typically costs more than ink-jet printer, but is much faster

Printers What is a thermal printer? p. 181 Fig Next  Generates images by pushing electrically heated pins against heat-sensitive paper  Dye-sublimation printer, (also called a digital photo printer) uses heat to transfer dye to specially coated paper

Printers What is a mobile printer? p. 182 Fig Next  Small, lightweight, battery-powered printer that allows mobile user to print from notebook computer, Tablet PC, or PDA while traveling

Printers What is a plotter? p. 182 Fig Next  Sophisticated printer used to produce high-quality drawings  Large-format printer creates photo-realistic-quality color prints

Printers What is wireless printing? p. 182 Next  Output transmitted to printer wirelessly via infrared light waves or radio waves  Bluetooth printing uses radio waves  Devices need to be within 30-foot range

Other Output Devices What is an audio output device? p. 183 Fig Next  Computer component that produces music, speech, or other sounds  Speakers and headsets are common devices Click to view Web Link, click Chapter 5, Click Web Link from left navigation, then click Speakers and Headsets below Chapter 5

Other Output Devices What is voice output? p. 183 Fig Next  Computer talks to you through speakers on computer  Internet telephony allows you to have conversation over Web

Other Output Devices What is a facsimile (fax) machine? p. 184 Fig Next  Device that transmits and receives documents over telephone lines What is a fax modem?  Modem that allows you to send and receive electronic documents as faxes

Other Output Devices What is a multifunction peripheral? p. 184 Fig Next  Provides functionality of printer, scanner, copy machine, and fax machine

Other Output Devices What is a data projector? p. 185 Fig Next  Device that takes image from computer screen and projects it onto larger screen

Putting It All Together What are suggested output devices for the home user? p. 186 Fig Next

Putting It All Together What are suggested output devices for the small office/home office user? p. 186 Fig Next

Putting It All Together What are suggested output devices for the mobile user? p. 186 Fig Next

Putting It All Together What are suggested output devices for the large business user? p. 186 Fig Next

Putting It All Together What are suggested output devices for the power user? p. 186 Fig Next

Input and Output Devices for Physically Challenged Users What input devices are available for those with physical limitations? p. 187 Fig Next  Keyboards with larger keys  Head-mounted pointer controls pointer on screen

Input and Output Devices for Physically Challenged Users What other output options are available for visually impaired users? p. 187 Fig Next  Change Window settings, such as increasing size or changing color of text to make words easier to read  Blind users can work with voice output  Braille printer outputs information in Braille onto paper Click to view video

Processing and organizing input into output Summary of Input and Output Data and instructions Various techniques of input Commonly used input devices Various methods of output Commonly used output devices Chapter 5 Complete