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Transcript

  • 1. COMPUTER PROJECT
  • 2. VOICE INPUT & RECOGNITION SYSTEM BARCODE READER TOUCH SCREEN SCANNER LIGHT PEN MOUSE KEYBOARD PUNCHED CARD INPUT DEVICES
  • 3. Input Devices.
    • Introduction
    • Punched card
    • Keyboard
    • Mouse
    • Light Pen
    • Scanner
    • Touch screen
    • Barcode Reader
    • Voice Input & Recognition System
    • Printers
    ----By Hemal..Dagli FYBMS-A Rno-07
    • Introduction
    • Punched card
    • Keyboard
    • Mouse
    • Light Pen
    • Scanner
    • Touch screen
    • Barcode Reader
    • Voice Input & Recognition System
    • Printers
    ----By Hemal..Dagli FYBMS-A Rno-07
  • 4. Introduction
    • Those peripheral devices which supply information i.e. data & program from the outside world to the computer are the Input Devices
    • Those peripheral devices which give information from the computer to the user or store them in secondary storage devices are the Output Devices
  • 5. Punched Card
    • Advantages:
    • They are cheaper
      • Unlike magnetic tape and magnetic disk they are human readable.
      • If an error occurs data can be changed simply by replacing the wrong card with a correct card unlike magnetic tape.
    • Disadvantages:
      • Cards cannot be erased and reused.
      • A card deck needs careful handling and storage.
      • Low data density
      • They are bulky
      • Folded, stapled or mutilated cards are not accepted by a card reader.
  • 6. Keyboard
    • Keyboard are on line devices that are used for entering data directly into the computer.
    • Keyboard is similar to typewriter keyboard.
    • The keys on the keyboard include
      • Type writer keys – alphabets, numbers, shift, ctrl, alt, special symbols, comma etc.
      • Function Keys – F1 to F12
      • Cursor Control Keys – Four arrow keys
      • Control Key Pad – pg up, pg down, home, end etc.
      • Numeric cum cursor pad
  • 7. Mouse
    • Mouse is a pointing device.
    • It is used to control and manipulate cursor movement on the screen.
    • The mouse usually has three buttons on it and a roller ball which signals the movement.
    • It is specially used for graphic applications and for cursor movement.
    • Buttons on the top of the mouse has predefined functions .
  • 8. LIGHT PEN
    • A Light Pen is a pointing device shaped like a pen and is connected to a VDU.
    • The tip of the light pen contains a light-sensitive element (photocell) which, when placed against the screen, detects the light from the screen enabling the computer to identify the location of the pen on the screen.
    • Light pens have the advantage of 'drawing' directly onto the screen (CAD)
  • 9. SCANNER
    • Scanners allow information such as a photo or text to be input into a computer memory directly.
    • A scanner scans an image and transforms the image to the code used by a computer.
    • Scanner are of two types-
      • Flatbed scanner
      • Roller fed scanner
  • 10. TOUCH SCREEN
    • A Touch Sensitive Screen is a
    • pointing device that enables the user to interact with the computer by touching the screen.
    • By touching the screen the user can make a selection or move a cursor.
    • Touch screens are used in airline and railway reservation counter, ATM etc.
  • 11. BARCODE READER
    • Barcode Reader reads special lines or bar codes.
    • Data is represented in bar code by the width of the bars and the distance between them. The most common bar code is the Universal Product Code found in most of the grocery items.
    • The bars are read by a hand held wand reader or by a fixed scanner. The computer system identifies the product, its brand name and other information.
    • The latest software available for bar code is Bar Code Pro.
  • 12. VOICE INPUT & RECOGNITION SYSTEM
    • This is an input device, consisting of a microphone that converts human speech into electrical signals.
    • These signal pattern is transmitted to the computer where it is attached against pre stored pattern known as vocabulary to identify the input.
    • The system is initially operated in training mode to train the system to recognize the voice pattern and then it operates.
    • It reduces the cost of data entry.
  • 13. OUTPUT DEVICE
  • 14. PRINTERS
    • Impact Printers
    • Non Impact Printers
    Commonly used because their functioning is relatively easy multiple copies can be produced at the same time with the help of carbon paper. Dot Matrix Printers, Line printers, daisy wheel printers They uses thermal, chemical, electrostatic and inkjet technologies for printing. Laser printers, DeskJet printers
  • 15. TYPES OF PRINTERS Dot Matrix Printer Daisy Wheel Daisy Wheel Printer
  • 16. Line Printer Drum Printer Chain Printer
  • 17. Ink Jet Printer Las e r Printer