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## Input Devices ### Magnetic Strip Codes A magnetic strip is a narrow length of ferro-magnetic plastic tape embedded in the back or front of a credit card or payment card. It acts as a "key" when reading data from the strip. The card is swiped by a reader that has a magnetic head. The strip w...

## Input Devices ### Magnetic Strip Codes A magnetic strip is a narrow length of ferro-magnetic plastic tape embedded in the back or front of a credit card or payment card. It acts as a "key" when reading data from the strip. The card is swiped by a reader that has a magnetic head. The strip was the first hotel can use the card holder's bank account to verify hotel charges. It can quickly identify and allow cards to enable many enterprises, including banking transactions. There are now many systems that allow the card's phone number to be used for service payments. The magnetic stripe includes phone alerts and debit cards for purchases. The money is put on these cards continuous information about the transaction about the card. ### Audio and Video Input Devices The different types of audio and video input devices include the following: * Voice data entry or voice recognition systems * Sound capture devices * Microphones * Digital video cameras * Smart cards * Motion-sensing devices ### Voice Data Entry or Voice Recognition Systems Voice recognition systems require the use of a microphone. This system accepts the spoken word as input data or commands. Human speech is complex because it carries tones, inflections and emphasis of various parts of words and phrases. The computer is programmed to recognize certain patterns of speech. Using a microphone, human speech is coded into a sequence of electronic signals. These signals are compared to a set of stored patterns. If they match, the command or data being entered is accepted by the computer and processed. Simple commands can be used to control machines or even "type" letters in a word processor. Voice recognition has become important in many areas of our lives. It has made life easier for people with movement difficulties, such as those who are paralysed, and who, with suitable equipment, can now operate a wheelchair, lighting and even open doors using voice commands.