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US 5,311,453 AGranted
Variable point sampling
AssigneeNoise Cancellation Technologies, Inc.
InventorsJeffrey N. Denenberg, Roy H. Scott
Life of this patent
Estimating the term…
Abstract
A method and system by which the number of samples used to characterize the noise cycle of an active noise cancellation system varies dynamically as a function of the fundamental operating frequency of the system.
Claims4
In a digital, synchronous, noise cancellation system for canceling the frequency components, the method of maintaining the sampling rate and required processing resources within a small range while the fundamental noise cycle varies over a large range, said method comprising
- determining the highest frequency to be processed,
- determining the current noise cycle rate,
- changing the number of sample points per noise cycle dependent upon the noise cycle rate and the highest frequency to be processed.
Dependencies are inferred from the claim text.