Pertemuan 3 Understanding Input Peripherals

1. Pertemuan 3Understanding Input Peripherals Matakuliah : J0282 / Pengantar Teknologi Informasi Tahun : 2005 Versi : 02/02

2. Learning Outcomes Pada akhir pertemuan ini, diharapkan mahasiswa akan mampu : • menjelaskan tentang contoh-contoh perangkat input pada komputer

3. Outline Materi • Pointing Devices • Voice Input • Input Devices for Mobile User • Scanners

4. What Is Input? • What isinput? • Data or instructions entered into memory of computer • Input device is any hardware component used to enter data or instructions

5. What Is Input? • What are the two types of input? • Data • Unprocessed text, numbers, images, audio, and video • Instructions • Programs • Commands • User responses

6. The Keyboard • How is the keyboard divided? • Typing area • Numeric keypad • Function keys, special keys that issue commands

7. The Keyboard • What is acordless keyboard? • Communicate with a receiver attached to a port on the system unit

8. mouse buttons wheel button ball mouse pad Pointing Devices • What is amouse? • Pointing device that fits under palm of hand • Pointing device controls movement of pointer, also called mouse pointer • Mechanical mousehas rubber or metal ball on underside

9. Pointing Devices • What is anoptical mouse? • No moving mechanical parts inside • Senses light to detect mouse’s movement • More precise than mechanical mouse • Connects using a cable, or wireless

10. Other Pointing Devices • What is atrackball? • Stationary pointing device with a ball on its top • To move pointer, rotate ball with thumb, fingers, or palm of hand

11. Other Pointing Devices • What are atouchpadand apointing stick? • Touchpadis small, flat, rectangular pointing device sensitive to pressure and motion • Pointing stickis pointing device shaped like pencil eraser positioned between keys on keyboard

12. Other Pointing Devices • What are ajoystickand awheel? • Joystickis vertical lever mounted on a base • Wheelis steering-wheel-type input device • Pedal simulates car brakes and accelerator

13. Other Pointing Devices • What is alight pen? • Handheld input device that can detect light • Press light pen against screen surface and then press button on pen

14. Other Pointing Devices • What is atouch screen? • Touch areas of screen with finger • Often used with kiosks

15. Other Pointing Devices • What is astylus? • Looks like a ballpoint pen, but uses pressure to write text and draw lines • Used withgraphics tablets, flat electronic boards

16. Other Pointing Devices • Where is a stylus used? • Some desktop computers • Many mobile computers and devices • Handwriting recognition software translates handwriting into characters that computer can process

17. Step 1. A user dictates text into a microphone. 10010111010110101100001101 Step 4. To narrow a list down, software presents user with a list of choices or uses a natural language component to predict most likely match. User may correct any selection made by software. Step 3. Software compares spoken measurements with those in its database to find a match or list of possible matches. Natural Language Engine Matches Voice Input • How does voice recognition work? Step 2. An analog-to-digital converter (ADC) translates sound waves into digital measurements computer can process. Measurements include pitch, volume, silences, and phonemes. Phonemes are sound units such as aw and guh.

18. Voice Input • What is aMIDI (musical instrument digital interface)? • External device, such as electronic piano keyboard, to input music and sound effects

19. PDAs, Tablet PCs, and Smart Phones • How is a data entered into a PDA?

20. PDAs, Tablet PCs, and Smart Phones • What is aportable keyboard? • Full-sized keyboard you conveniently attach to and remove from PDA

21. Virtual Keyboard

22. PDAs, Tablet PCs, and Smart Phones • What is asmart phone? • Users can input and send text messages, graphics, pictures, video clips, and sound files • Many have a built-in or attachable camera

23. Digital Cameras • What is adigital camera? • Allows you to take digital pictures • Images viewable immediately on camera • Download to computer • Post pictures to Web

24. Video Input • What isvideo input? • Process of entering full-motion images into computer • Video capture cardis adapter card that converts analog video signal into digital signal that computer can use • Digital video (DV) camerarecords video as digital signals

25. Video Input • What are aPC video cameraand aWeb cam? • PC video camerac—cDV camera used to capture video and still images, and to make video telephone calls on Internet • Also called PC camera • Web camc—cvideo camera whose output displays on a Web page

26. Video Input • What isvideo conferencing? • Two or more geographically separated people who use network on Internet to transmit audio and video data • Whiteboard is another window on screen that can display notes and drawings simultaneously on all participants’ screens

27. Flatbed Pen or Handheld Sheet-fed Drum Scanners and Reading Devices • What is ascanner? • Light-sensing device that reads printed text and graphics • Used for image processing, converting paper documents into electronic images

28. Scanners and Reading Devices • What is anoptical reader? • Device that uses light source to read characters, marks, and codes and then converts them into digital data • Optical character recognition (OCR)reads characters in OCR font • Optical mark recognition (OMR) reads hand-drawn pencil marks, such as small circles • Bar code scanner

29. Scanners and Reading Devices • What is abar code reader? • Uses laser beams to read bar codes

30. Scanners and Reading Devices • What is adata collection device? • Obtains data directly at location where transaction or event takes place • Transmits data over network or Internet

31. Terminals • What is apoint of sale (POS) terminal? • Records purchases, processes credit or debit cards, and updates inventory • Swipe credit or debit card through card readerc—creads customer’s personal data from magnetic strip

32. Terminals • What is anautomated teller machine (ATM)? • Self-service banking machine that connects to a host computer through a network

33. Terminals • What is asmart display? • Thin monitor that detaches from computer to function as portable wireless touch screen

34. Biometric Input • What isbiometrics? • 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

35. Biometric Input • What are examples of biometric technology? • Voice verification system compares live speech with stored voice pattern • Signature verification system recognizes shape of signature • Iris recognition systemreads 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

36. Source : Shelly, Gary B. Discovering Computers (2004/2005/2006). Thomson Course Technology. PPT for Chapter 5.