This classic electrical engineering text by a prominent educator is consistently praised not only for its wealth of information but also for a level of detail seldom found in other contemporary books. Frequently cited as a valuable reference for instructors and professionals, the treatment is enhanced throughout with extremely useful examples and problems. AUTHOR: Athanasios Papoulis (1921-2002) was a Greek-American engineer and applied mathematician. He taught for many years at the Polytechnic Institute of Brooklyn - now the Polytechnic Institute of New York University - where he was named University Professor. His main focus was in the area of communications and signal processing. He wrote over 150 scholarly papers and several highly regarded and widely used texts for electrical engineering students.