igital and Digital-to-Analog conversion chips that translate the outgoing audio signal from analog to digital and the incoming signal from digital back to analog. There is also a Digital Signal Processor that is highly customized processor designed to perform signal manipulation calculations at high speed.
             The microprocessor controls the keyboard and display and deals with command and control signaling with the base station, it also coordinates the rest of the functions on the board. This microprocessor is as powerful as the super computer of the 70's that took up whole rooms, but is now the size of a finger. By using its arithmetic/logic unit or ALU it can perform all mathematical operation that run many of today features in phones. It is also responsible for the transfer of data throughout the phone. It will also make decisions and then run a new set of instructions. In Appendix C figure 3 a very simple microprocessor is shown. Cell phones use
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