Multiple source self noise cancellation
AssigneeNoise Cancellation Technologies, Inc.
InventorsMichael J. Parrella, Dexter G. Smith
Life of this patent
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Abstract
A repetitive noise cancellation system for multiple noise sources employing a controller (36) which senses radiated noise by reference sensors (35) and the status of the noise sources by position sensors (37, 38) and automatically controls one of the noise sources so that the noises being emitted from the multiple sources cancel one another.
Claims28
A repetitive phenomena canceling controller system for canceling unwanted repetitive phenomena generated by co-located rotating devices comprising
- known frequency determining means for generating a known electrical frequency signal corresponding to the known fundamental frequencies of the unwanted repetition phenomena generated by the co-located rotating devices,
- a means for determining the relative timing of the generation of the fundamental unwanted phenomena using said known electrical frequency signal as a synchronizing signal,
- a single residual sensor for sensing and generating an electrical signal related to the residual unwanted noise,
- a plurality of actuators for providing canceling phenomena signals at a plurality of locations,
- controller means for automatically controlling each of the actuators as a function of the fundamental phenomena and the residual sensors while accommodating the interaction between various sensors and actuators.
A repetitive phenomena canceling controller system for canceling unwanted repetitive phenomena generated by co-located rotating devices comprising
- known frequency determining means for generating a known electrical frequency signal corresponding to the known fundamental frequencies of the unwanted repetition phenomena, wherein the unwanted repetition phenomena is generated by an air-moving device having two or more co-located rotating devices,
- a means for determining the relative timing of the generation of the fundamental unwanted phenomena using said known electrical frequency signal as a synchronizing signal,
- a single residual sensor for sensing and generating an electrical signal related to the residual unwanted noise,
- a plurality of actuators for providing canceling phenomena signals at a plurality of locations,
- controller means for automatically controlling each of the actuators as a function of the fundamental phenomena and the residual sensors while accommodating the interaction between various sensors and actuators.
Dependencies are inferred from the claim text.