Systems and methods for noise-cancellation using microphone projection

Patent metadata

Field	Value
Publication number	US-10629183-B2
Application number	US-201816120171-A
Country	US
Kind code	B2
Filing date	Aug 31, 2018
Priority date	Aug 31, 2018
Publication date	Apr 21, 2020
Grant date	Apr 21, 2020

Abstract

A noise-cancellation system includes a noise-cancellation filter configured to generate a noise-cancellation signal based on a noise signal received from a noise sensor; an actuator disposed at a first location within a predefined volume and configured to receive the noise-cancellation signal and to transduce a noise-cancellation audio signal within the predefined volume; a reference sensor disposed at a second location within the predefined volume and to output a reference sensor signal, the reference sensor signal being representative of an undesired noise at the second location; a filter configured to filter the noise-cancellation signal and the reference sensor signal to output a filter output signal, the filter output signal representing an estimate of the undesired nose at a third location remote from the first location and the second location; and an adjustment module configured to adjust the noise-cancellation filter, based on the filter output signal, such that the noise-cancellation audio signal destructively interferes with the undesired noise at the third location.

First claim

What is claimed is:

1. A noise-cancellation system, comprising:
a noise-cancellation filter configured to generate a noise-cancellation signal based on a noise signal received from a noise sensor;
an actuator disposed at a first location within a predefined volume and configured to receive the noise-cancellation signal and to transduce a noise-cancellation audio signal within the predefined volume;
a reference sensor disposed at a second location within the predefined volume and to output a reference sensor signal, the reference sensor signal being representative of an undesired noise at the second location;
a filter configured to filter the noise-cancellation signal and the reference sensor signal to output a filter output signal, the filter output signal representing an estimate of the undesired nose at a third location remote from the first location and the second location; and
an adjustment module configured to adjust the noise-cancellation filter, based on the filter output signal, such that the noise-cancellation audio signal destructively interferes with the undesired noise at the third location.

2. The noise-cancellation system of claim 1 , wherein the filter output signal is based on an estimate of a relationship between the first location and the third location and based on an estimate of a relationship between the second location and the third location.

3. The noise-cancellation system of claim 1 , wherein the filter comprises a first filter configured to estimate a relationship between the second location and the third location, the first filter being configured to receive and filter the reference sensor signal and to output a first filter output signal, the first filter output signal being an estimate of the undesired noise at the third location.

4. The noise-cancellation system of claim 3 , wherein the filter further comprises a second filter configured to estimate a relationship between the first location and the third location, the second filter being configured to receive and filter the noise-cancellation signal and to output a second filter output signal, the second filter output signal being an estimate of the noise-cancellation audio signal at the third location, wherein the second filter output signal is configured to cancel a portion of the first filter output signal based on the noise-cancellation audio signal received at the reference sensor, when the first filter output signal and the second filter output signal are summed.

5. The noise-cancellation system of claim 1 , wherein the filter comprises at least one predictive filter such that the estimate the undesired noise at the third location is an estimate of the undesired noise at the third location at a future point in time.

6. The noise-cancellation system of claim 5 , wherein the at least one predictive filter is a Wiener filter.

7. Program code stored on a non-transitory storage medium that, when executed by a processor, comprises the steps of:
generating, with a noise-cancellation filter, a noise-cancellation signal based on a noise signal received from a noise sensor;
providing the noise-cancellation signal to an actuator disposed at a first location for transduction of a noise-cancellation audio signal within a predefined volume;
receiving a reference sensor signal from a reference sensor disposed at a second location within the predefined volume, the reference sensor signal being representative of an undesired noise at the second location;
filtering, with a filter, the noise-cancellation signal and the reference sensor signal to output a filter output signal, the filter output signal representing an estimate of the undesired noise at a third location remote from the first location and the second location; and
adjusting the noise-cancellation filter, based on the filter output, such that the noise-cancellation audio signal destructively interferes with the undesired noise at the third location.

8. The program code of claim 7 , wherein the filter output signal is based on an estimate of a relationship between the first location and the third location and based on an estimate of a relationship between the second location and the third location.

9. The program code of claim 7 , wherein the filter comprises a first filter configured to estimate a relationship between the second location and the third location, the first filter being configured to receive and filter the reference sensor signal and to output a first filter output signal, the first filter output signal being an estimate of the undesired noise at the third location.

10. The program code of claim 9 , wherein the filter further comprises a second filter configured to estimate a relationship between the first location and the third location, the second filter being configured to receive and filter the noise-cancellation signal and to output a second filter output signal, the second filter output signal being an estimate of the noise-cancellation audio signal at the third location, wherein the second filter output signal is configured to cancel a portion of the first filter output signal based on the noise-cancellation audio signal received at the reference sensor, when the first filter output signal and the second filter output signal are summed.

11. The program code of claim 7 , wherein the filter comprises at least one predictive filter such that the estimate the undesired noise at the third location is an estimate of the undesired noise at the third location at a future point in time.

12. The program code of claim 7 , wherein the at least one predictive filter is a Wiener filter.

13. A noise-cancellation method, comprising the steps of:
generating, with a noise-cancellation filter, a noise-cancellation signal based on a noise signal received from a noise sensor;
providing the noise-cancellation signal to an actuator disposed at a first location for transduction of a noise-cancellation audio signal within a predefined volume;
receiving a reference sensor signal from a reference sensor disposed at a second location within the predefined volume, the reference sensor signal being representative of an undesired noise at the second location;
filtering, with a filter, the noise-cancellation signal and the reference sensor signal to output a filter output signal, the filter output signal representing an estimate of the undesired noise at a third location remote from the first location and the second location; and
adjusting the noise-cancellation filter, based on the filter output, such that the noise-cancellation audio signal destructively interferes with the undesired noise at the third location.

14. The method of claim 13 , wherein the filter output signal is based on an estimate of a relationship between the first location and the third location and based on an estimate of a relationship between the second location and the third location.

15. The method of claim 13 , wherein the filter comprises a first filter configured to estimate a relationship between the second location and the third location, the first filter being configured to receive and filter the reference sensor signal and to output a first filter output signal, the first filter output signal being an estimate of the undesired noise at the third location.

16. The method of claim 15 , wherein the filter further comprises a second filter configured to estimate a relationship between the first location and the third location, the second filter being configured to receive and filter the noise-cancellation signal and to output a second filter output signal, the second filter output signal being an esti

Assignees

• Bose Corp

Inventors

• Torres Wade
• Bernstein Eric
• Jain Ankita

Classifications

• G10K2210/3011

  Single acoustic input · CPC title

• G10K2210/3028

  Filtering, e.g. Kalman filters or special analogue or digital filters · CPC title

• G10K11/17881

  the reference signal being an acoustic signal, e.g. recorded with a microphone · CPC title

• G10K2210/3055

  Transfer function of the acoustic system · CPC title

• G10K2210/3026

  Feedback · CPC title