Using Information Technology презентация

Using Information Technology Chapter 6 Hardware: Input & Output

Hardware--Input & Output Taking Charge of Computing & Communications

6.1 Input & Output Input hardware - devices that translate data into a form the computer can process Output hardware - devices that translate information processed by the computer into a form that humans can understand

6.2 Input Hardware Keyboard - a device that converts letters, numbers, and other characters into electrical signals that can be read by the computer’s processor

Keyboards Traditional computer keyboards Specialty keyboards and terminals Dumb terminals Intelligent terminals Internet terminals

Keyboards Specialty keyboards and terminals: Dumb terminal: Airline reservations Intelligent terminal: Automatic teller machine (ATM) Point-of-sale (POS) terminal Internet terminal: Set-top box PDA

Pointing Devices Pointing devices - control the position of the cursor or pointer on the screen Mouse Trackball Pointing stick Touchpad

Pointing Devices The mouse and its variants: Mouse Trackball Pointing stick Touchpad

Pointing Devices The mouse and its variants: Mouse Trackball Pointing stick Touchpad

Pointing Devices The mouse and its variants: Mouse Trackball Pointing stick Touchpad

Pointing Devices

Pointing Devices Pen input: Pen-based computer system - allows users to enter handwriting and marks onto a computer screen by means of a penlike stylus rather than by typing on a keyboard

Pointing Devices Pen input: Light pen - a light-sensitive penlike device that uses a wired connection to a computer terminal

Pointing Devices Pen input: Digitizer - converts drawings and photos to digital data using a mouselike device called a puck

Scanning and Reading Devices Source data-entry devices – create machine-readable data Scanners - use light-sensing equipment to translate images of text, drawings, photos, and the like into digital form

Scanning and Reading Devices Bar-code readers: Bar codes - photoelectric scanners that translate the symbols in the bar code into digital code

Scanning and Reading Devices Mark-recognition and character-recognition devices – sense marks or characters MICR - character recognition system that uses magnetic ink and special characters OMR OCR

Scanning and Reading Devices Mark-recognition and character-recognition devices: MICR OMR - uses a device that reads bubble marks and converts them into computer-usable form OCR

Scanning and Reading Devices Mark-recognition and character-recognition devices: MICR OMR OCR - converts scanned text from images to an editable text format that can be imported into a word processing application and manipulated

Scanning and Reading Devices Fax machine – scans an image and sends it as electronic signals over telephone lines to a receiving fax machine Types of fax machines: Dedicated fax machine Fax modem

Source Data-Entry Devices Types of fax machines: Dedicated fax machine Fax modem

Audio-Input Devices Audio-input device - records analog sound and translates it for digital storage and processing Digitizing an audio signal: sound board MIDI board

Webcams & Video-Input Cards Webcam – a video camera attached to a computer to record moving images that can be posted on a website in real time Video cards: Frame-grabber video card Full-motion video card

Digital Cameras Digital camera - uses a light-sensitive processor chip to capture photographic images in digital form and store them on a small diskette

Speech-Recognition Systems Speech-recognition system - converts a person’s speech into digital signals

Sensors Sensor – an input device that collects specific data directly from the environment and transmits it to a computer

Radio-Frequency Identification Tags RFID tags – based on an identifying tag bearing a microchip that contains specific code numbers

Human-Biology-Input devices Biometrics - the science of measuring individual body characteristics