Chapter 5 Input and Output

What Is Input? What is input? p. 166 Fig. 5-1 Next  Input device is any hardware component used to enter data or instructions into a computer  Data or instructions entered into the memory of computer

Keyboard and Pointing Devices What are a touchpad and a pointing stick? p. 170 Figs. 5-5—5-6 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 is a touch screen? p. 171 Fig. 5-9 Next  Touch areas of screen with finger  Often used with kiosks

Keyboard and Pointing Devices What is a stylus and a digital pen? p. 172 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 Pen Input 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. 173 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. 173 Fig Next What is audio input?  Entering sounds into a computer - speech, music, and sound effects  MIDI - (Musical Instrument Digital Interface) standard defining how digital musical devices represent sound electronically

Other Input Devices What is resolution? p. 175 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 a scanner? p. 177 Fig Next  Light-sensing device that reads printed text and graphics  Used for image processing, converting paper documents into electronic images 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 a magnetic stripe card reader? p. 179 Fig Next  Reads the magnetic stripe on the back of a credit card  Exposure to a magnetic field can erase the contents of a card’s magnetic stripe

Other Input Devices What is biometrics? p. 181 Fig Next  Authenticates person’s identity by verifying a personal characteristic  Fingerprint scanner captures curves and indentations of fingerprint 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. 181 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. 182 Fig Next  Data that has been processed into a useful form, called information  Output device is any hardware component that can convey information to one or more people

Display Devices What is an LCD monitor? p. 184 Fig Next  Uses liquid crystal display  Have a small footprint  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

Other Output Devices What is voice output? p. 194 Next  Computer talks to you through speakers on computer  Internet telephony allows you to have conversation over Web

Input and Output Devices for Physically Challenged Users What input devices are available for those with physical limitations? p. 197 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. 197 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