Example image of eyePlorer eyePlorer map for 'Harold Stephen Black': 1898 1983 April 14 December 11 Electrical engineering Negative feedback Electronics Distortion Intermodulation Worcester Polytechnic Institute Bell Labs Western Electric Harry Nyquist Hudson River New Jersey New York City Manhattan Pulse-code modulation Doctor of Engineering National Inventors Hall of Fame Robert H. Goddard Audio Engineering Society Franklin Institute Research Corporation United States Department of War LEAK Negative feedback amplifier Robust control Nyquist rate List of systems scientists Valve amplifier Control theory Cybernetics Feedback 1927 Nyquist–Shannon sampling theorem Timeline of United States inventions