H. J. L. Struycken was a Dutch otolaryngologist, phonetician, and acoustician. After studying medicine in Groningen, in 1893 he started working at the Voorburg psychiatric hospital near Vught, where he attempted to distinguish psychiatric conditions from neurological speech disorders. His interest in phonetics and acoustics took Struycken to France and Germany, to visit clinics and approach instrument makers who could produce tuning forks for him to use in his clinical research.
Adriaan Daniël Fokker was a prominent Dutch theoretical physicist. He is known in theoretical physics for the Fokker-Planck equation and his work on the theory of relativity. In the years around 1930, however, Fokker also became interested in room acoustics and the tuning of musical instruments. He designed several sound reflectors, which amplify the sound reaching the audience, especially in churches, but his work on musical instrument tuning is what made him more widely known.
Cornelis Zwikker was a Dutch physicist and one of the initiators of the Dutch Sound Foundation. After studying chemistry, mathematics, and physics in Amsterdam, he worked with Philips in Eindhoven until 1929, when he was appointed professor of theoretical and applied physics at the Delft University of Technology. Zwikker was responsible for the acoustic design of many buildings, among them the studios of the Dutch broadcasting organization AVRO.
Jules Antoine Lissajous was a high-school teacher, then held prestigious administrative posts in the education system of various parts of France. He had trained in physics, and defended his dissertation on vibratory phenomena in 1850.
The Dutch Sound Foundation (Nederlandse Geluidstichting) was established in 1934 by scientists and engineers at the Society for Materials Research and the Royal Academy for Engineers, who also invited representatives of local and national government, car drivers, housewives, architects, aircraft manufacturers, and clergy to participate.
“Telstaat Rijkswaterstaat, Directie Wegenverbetering, Verkeerswaarnemingen 1935. [Counting List, State Department For The Maintenance Of Dikes, Roads, Bridges And Canals, Directorship Road Improvement, Traffic Observations 1935]”. 1935. [Counting List, State Department For The Maintenance Of Dikes, Roads, Bridges And Canals, Directorship Road Improvement, Traffic Observations 1935].
The Watkins Electric Music (WEM) Copicat tape echo creates audible repetitions of sounds by using an endless tape loop. As an electronic effect for rock musicians, it was popular during the 1960s, undergoing a series of modifications in the decades following its creation by Charles Watkins in 1958. It is notable for its successful combination of several distinct areas of audio technology: electronic recording, the use of endless loops, and the use of an intermediate storage medium (tape) to achieve delayed playback.