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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

Pending Publication Date: 2019-10-25
SILENCER DEVICES LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Also, despite the greater processing power, automatic noise cancellation using various adaptive filters has an upper frequency limit below approximately 4kHz, with signal attenuation capabilities between 10dB and 30dB

Method used

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  • Noise cancellation using segmented, frequency-dependent phase cancellation
  • Noise cancellation using segmented, frequency-dependent phase cancellation
  • Noise cancellation using segmented, frequency-dependent phase cancellation

Examples

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Embodiment Construction

[0044] Example embodiments will now be described more fully with reference to the accompanying drawings.

[0045]The disclosed muffler devices can be deployed in a variety of different applications. For purposes of illustration, five exemplary embodiments will be discussed in detail herein. It should be appreciated that these examples provide an understanding of some of the different uses for muffler devices. Other uses and other applications are also possible within the scope of the appended claims.

[0046] refer to figure 1 , showing a first exemplary embodiment of a muffler device. This embodiment is designed to provide noise cancellation for an in-air system where incoming ambient noise is sensed and a noise cancellation signal is generated and broadcast to the surrounding area. As shown, this embodiment includes a digital signal processor circuit 10 with an associated memory 12 in which configuration data, referred to herein as application presets, is stored. The d...

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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.

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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Application Information

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IPC IPC(8): G10K11/178
CPCG10K11/17813G10K11/17857G10K2210/3025G10K2210/3057G10K11/1785G10K2210/3044G10K11/17815G10K11/17853G10K11/17881G10K2210/511G10K2210/3026G10K2210/3012G10K2210/1081G10K2210/1282G10K2210/112H04L63/0428G10K2210/12G10K11/178G10K2210/3028
Inventor 尤金·希格里夫让·克洛德·朱诺
Owner SILENCER DEVICES LLC
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