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LECTURE #2 FUNDAMENTAL COMMUNICATIONS COMMUNICATION SYSTEMS 1. All electronic communication systems have a transmitter, a communication channel or medium, and a receiver. a) A transmitter converts the information or intelligence into electromagnetic waves (electric and magnetic fields). b) The communication channel moves electromagnetic energy from one point to another. c) The three popular communication channels are i) free space (radio). ii) wire. iii) fiber optic cable. d) The receiver converts the electromagnetic waves back into information or intelligible. 2. All communication systems are also subject to noise in the communication channel and in the receiver. Noise is a serious problem.
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3. What is noise? Noise is random, undesirable electronic energy that enters the communication system via the communicating medium to interfere with the transmitted message. 4. Examples of External Noise: a) atmosphere (e.g. from lightning, which produces static) b) from outer space, where the sun and other stars emit various kinds of radiation
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This note was uploaded on 11/14/2011 for the course ECT 350 taught by Professor Brom during the Summer '11 term at N.C. A&T.

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