John Renshaw Carson

John Renshaw Carson ( born June 28, 1886 in Pittsburgh, Pennsylvania, † October 31, 1940 in New Hope ( Pennsylvania)) was an American communications engineer. He invented the single-sideband (SSB ).

At Princeton University, he earned his Bachelor of Science in 1907, 1909 and 1912, his Master of Electrical Engineering. 1907/ 08 he was at MIT. From 1912 to 1914 he was professor of physics at Princeton and electrical engineering.

In 1914 he joined the American Telephone & Telegraph (now AT & T) where he participated in experiments on the radio. In 1915 he invented the single-sideband modulation in order to transmit several telephone calls simultaneously through a circuit, and installed the first transmission systems between Pittsburgh and Baltimore.

In 1922 he published a mathematical treatise for frequency modulation, in which he presented the Carson formula for bandwidth. Edwin Howard Armstrong was later able to represent the advantages of frequency modulation.

From 1917 to 1925 he analyzed filter effects for amplitude modulation using the operator calculus to give developers the ability to suppress cross-talk on such multi-way lines.

From 1925 to 1940 he worked as a mathematician and electrical engineer for Bell Laboratories, where he was in 1932 with George C. Southworth led by optic experiments.

Publications

• Electrical Circuit Theory and Operational Calculus; 1926