Microphones


 * __MICROPHONES__**

__Definition:__ - A microphone is an instrument that converts sounds waves into an electric current that is usually fed into an amplifier, or in our case, a computer.

__Other Information:__ - A microphone is an input device as it allows computer users to input audio onto their computer. - Microphones can come in various styles however, they all serve a similar purpose and use the same technology behind it.




 * __SMART CARD READERS__**

__Definition:__ - A smart card reader is a device that is able to read external data from various mediums such as SD cards, these can be referred to as the smart card.

__Other information:__ - In order for smart card readers to work they need to read data stored in the RFID chip in a smart card. - Smart cards include things such as: credit cards, hotel room cards and health insurance cards. - The microprocessor on the smart card is there for security. The host computer and card reader actually "talk" to the microprocessor. The microprocessor enforces access to the data on the card. - Smarts cards may have up to 8 kilobytes of RAM.