July 2003
Intermediate to advanced
576 pages
11h 51m
English
Without electromagnetic shielding, power line cables are sensitive to ingress noises from radio frequency devices and other electromechanical equipment. Partially unbalanced wiring resulting from two-phase appliances and three-way switches makes the noise pickup a little worse. On the other hand, many household appliances, except light bulbs, make severe quasi-stationary or transient noise. Some of them are synchronized to the 60-Hz AC cycle, and others are impulses. Many of them can also come from nearby neighbors sharing the same transformer. From time to time, the noise level from a nearby appliance can exceed the transmit signal level. Information needs to be spread in both time and frequency domains ...
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