Noise cancellation using segmented, frequency-dependent phase cancellation

A noise, anti-noise technology used in the field of electronic and automatic noise cancellation to enhance clarity and reduce processing power and memory
CN110383373APending Publication Date: 2019-10-25SILENCER DEVICES LLC
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
SILENCER DEVICES LLC
Publication Date
2019-10-25

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Abstract

Noise abatement within a signal stream containing unwanted signal referred to as noise is performed by acquiring a digitized noise signal and using a digital processor circuit to subdivide the acquired noise signal into different frequency band segments and thereby generate a plurality of segmented noise signals. Then individually for each segmented noise signal, the processor shifts in time the segmented noise signal by an amount dependent on a selected frequency of the segmented noise signal to produce a plurality of shifted segmented noise signals. The precise time shift applied to each noise segment considers the frequency content of the segment and the system processing time. Individually for each segmented noise signal, amplitude scaling is applied. The shifted and amplitude-scaled segmented noise signals are then combined to form a composite anti-noise signal which is output into the signal stream to abate the noise through destructive interference.
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Description

[0001] Cross References to Related Applications

[0002] This application claims priority to U.S. Utility Application No. 15 / 497,417, filed April 26, 2017, and claims the benefit of U.S. Provisional Application No. 62 / 455,180, filed February 6, 2017. The entire disclosure of the above application is incorporated herein by reference. technical field

[0003] This application relates generally to electronic and automatic noise cancellation techniques. More specifically, the present application relates to a noise cancellation technique that produces frequency-dependent anti-noise components in multiple spectral bands, precisely calculated for the system and application. Background technique

[0004] For decades, scientists and engineers have been working on the problem of electronic automatic noise cancellation (ANC). The fundamental physics of wave propagation suggests that it is possible to generate "noise-resistant" waves that are 180 degrees out of phase with a noisy sign...

Claims

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