What did Paul Lueg's 1933 patent explicitly detail for noise suppression?

Answer

Using phase-advancing waves to suppress sinusoidal tones in ducts.

Paul Lueg's initial patent application from 1933, which was granted in 1936, specifically outlined a theoretical feedforward analog concept for active noise control. His vision involved detecting noise, processing the signal electronically to invert its polarity, and then using a loudspeaker to emit a canceling wave. The core mechanism detailed was the use of phase-advancing waves designed to destructively interfere with and suppress sinusoidal tones contained within ducts. This analog concept, while theoretically sound, required electronics far more precise than the available vacuum tube technology could offer at that time, rendering it commercially inert until later digital advancements.

What did Paul Lueg's 1933 patent explicitly detail for noise suppression?

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