input and output

Computer has play in important role in modernization era. This technology inventions has been improving since it first introduce d to the world. Computer make works become more easier and comfort for users. Many items on computer such as input and output.
Input is a data or instruction entered into the memory of computer. Input device is any hardware component that allows users to enter data and instructions. While output is a data that has been processed into useful form. Input device is any hardware that can conveys information to one or more people.
The other types of input is voice input, audio input, PDA, smart phone, tablet PC, digital camera, resolution, video input, PC video camera and a Web cam, video conferencing, scanner, turnaround document, optical reader, RFID reader, magnetic stripe card reader, MICR reader, POS terminal, ATM, and biometrics. While the other types of output device are audio output device, voice output, facsimile(fax) machine, multifunction peripheral and data projector.
Voice input is entering input by speaking into a microphone. Voice recognition or speech recognition is the computer’s capability to distinguish spoken words. Audio input is entering sounds into a computer-speech, music, and sound effects. MIDI- standard defining how digital musical devices represent sound electronically. Users can input and send text messages, graphics, pictures, video clips, and sound files on the smart phone. Tablet PC is a mobile computer. Primary input device is a pressure-sensitive digital pen. Digital camera allows you to take digital pictures. Images viewable immediately on camera such as download to computer and post pictures to web. Resolution is a number of horizontal and vertical pixels in a display device. Resolution range from 3 million to more than 16 million pixels (MP). Pixels (picture element) is smallest element in electronic image. Video input is a process of capturing full-motion images and storing them on a computer’s storage medium. PC video camera is DV camera used to capture video and still images and to make video telephone calls on internet. Web cam is a video camera that displays its output on a Web page. Video conferencing have two or more geographically separated people who used a network or the internet to transmit video and audio data. Scanner is a light-sensing device that reads printed text and graphics. Turnaround document is a document that you return to the company that sent it. Device that uses light source to read characters, marks, and code and then converts them into digital data as optical reader. RFID reader used to reads information on the tag via radio waves. Magnetic stripe card reader can reads the magnetic stripe on the back of a credit card. MICR reader can reads text printed with magnetic ink. POS terminal can records purchases, processes, credit or debit cards and updates inventory. ATM machine self-service banking machine that connects to a host computer through a network. Biometrics is a authenticates person’s identifying a personal characteristic. Example of biometric technology are voice verification, signature verification and iris recognition system.
Example of output device is computer component that produces music, speech or other sound. Voice output make computer talks to you through speaker on computer. Facsimile(fax) machine device that transmit and receives over telephone lines. Multifunction peripheral provides functionality of a printer, scanner, copy machine and fax machine. Data projector device that takes the text and image from computer screen and projects it onto larger screen.