The field of communications encompasses transmission of information by electromagnetic signals through wired and wireless links and networks. The information may be voice, images (still photographs and drawings), video, data, software, or text messages. The closely related field of signal processing involves manipulating electromagnetic signals so that they can be transmitted with greater accuracy, speed, reliability, and efficiency. Communications engineers design and develop equipment and systems for a great variety of applications, including digital telephony, cellular telephony, broadcast TV and radio, satellite communications, optical fiber communications, deep space communications, local-area networks, and Internet and World Wide Web communications. Signal processing engineers direct their attention to data compression, modulation systems, radar, sonar, computer-aided tomography (CAT), ultrasound imaging, and magnetic resonance imaging (MRI).
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