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A historical report is given on the invention of active noise control which is related to the person of Paul Lueg, a doctor of philosophy and medicine, who worked as a physicist for many years. He… Continue Reading
Generalizing the concept of active sound absorption, a system for active impedance control has been developed, so far for plane waves at normal incidence. The active reflector is a loudspeaker driven… Continue Reading
A short historical review of active noise control is followed by brief discussions of the physical principles and basis concepts of technical realisations, grouped by the geometrical system topology… Continue Reading
For active noise control of sound propagating down a duct in the fundamental mode commercial systems are available. Cancellation of sound also propagating in higher‐order modes adds the requirement… Continue Reading
Experimental and theoretical studies of certain types of multimode acoustical (like the wa= vepropagation in the SOFAR-Channel in deap sea ) and electromagnetic (especially in optical fibers )… Continue Reading