ABSTRACT

The first known application of active noise control was concerned with sound propagating in a duct and was conceived by Paul Lueg in Germany in the early 1930s. He filed a patent application in Germany in 1933 and in the United States in 1934. Unfortunately, Lueg was never able to demonstrate his idea successfully, partly because the field of electronics was not sufficiently advanced to enable the required precision amplifiers to be constructed and partly because his proposed system was oversimplified.