Systems and methods for noise-cancellation with shaping and weighting filters

Patent metadata

Field	Value
Publication number	US-10741165-B2
Application number	US-201816119468-A
Country	US
Kind code	B2
Filing date	Aug 31, 2018
Priority date	Aug 31, 2018
Publication date	Aug 11, 2020
Grant date	Aug 11, 2020

Abstract

A noise-cancellation system, including: a noise-cancellation filter configured to generate a noise-cancellation signal; an actuator configured to receive the noise-cancellation signal and to transduce a noise-cancellation audio signal based on the noise-cancellation signal, the noise-cancellation audio signal destructively interfering with an undesired noise in a noise-cancellation zone in a predefined volume; an error sensor configured to output an error sensor signal, the error sensor signal being representative of residual undesired noise in the noise-cancellation zone; a performance cost filter configured to receive and filter the error sensor signal and to output a performance cost filter signal, the performance cost filter signal being representative of the error sensor signal as weighted by a performance cost function; and an adjustment module configured to receive the performance cost filter signal and to adjust the noise-cancellation filter such that the noise-cancellation audio signal minimizes the performance cost filter signal.

First claim

What is claimed is:

1. A noise-cancellation system, comprising:
a noise-cancellation filter generating a noise-cancellation signal;
an actuator receiving the noise-cancellation signal and transducing a noise-cancellation audio signal based on the noise-cancellation signal, the noise-cancellation audio signal interfering with an undesired noise in a noise-cancellation zone in a predefined volume;
an error sensor outputting an error sensor signal, the error sensor signal being representative of residual undesired noise in the noise-cancellation zone;
a performance cost filter receiving and filtering the error sensor signal and outputting a performance cost filter signal, the performance cost filter signal being representative of the error sensor signal as weighted by a performance cost function; and
an adjustment module receiving the performance cost filter signal and adjusting the noise-cancellation filter such that the noise-cancellation audio signal minimizes the performance cost filter signal.

2. The noise-cancellation system of claim 1 , further comprising: an actuator effort cost filter receiving and filtering the noise-cancellation signal and outputting an actuator effort cost filter signal, the actuator effort cost filter signal being representative of the noise-cancellation signal as weighted by an actuator effort cost function, wherein the adjustment module further receives the actuator effort cost filter signal and adjusts the noise-cancellation filter such that the noise-cancellation audio signal minimizes the actuator effort cost filter signal.

3. The noise-cancellation system of claim 1 , wherein the error sensor is a microphone.

4. The noise-cancellation system of claim 1 , wherein the actuator is a speaker.

5. The noise-cancellation system of claim 1 , wherein the performance cost function increases the interference of a predetermined a frequency.

6. The noise-cancellation system of claim 1 , wherein the performance cost function increases the interference in the noise-cancellation zone and decreases the interference in a second noise-cancellation zone.

7. The noise-cancellation system of claim 2 , wherein the actuator effort cost function penalizes actuator effort within a range of frequencies.

8. The noise-cancellation system of claim 7 , wherein the actuator effort cost function penalizes actuator effort below a first frequency and above a second frequency, wherein the second frequency is higher than the first frequency.

9. A noise-cancellation system, comprising:
a noise-cancellation filter generating a noise-cancellation signal;
an actuator receiving the noise-cancellation signal and transducing a noise-cancellation audio signal based on the noise-cancellation signal, the noise-cancellation signal interfering with an undesired noise signal in a noise-cancellation zone;
an error sensor outputting an error sensor signal, the error sensor signal being representative of residual undesired noise in the noise-cancellation zone;
an actuator effort cost filter receiving and filtering the noise-cancellation signal and outputting an actuator effort cost filter signal, the actuator effort cost filter signal being representative of the noise-cancellation as weighted by an actuator effort cost function;
an adjustment module receiving the actuator effort cost filter signal and adjusting the noise-cancellation filter such that the noise-cancellation audio signal minimizes the actuator effort cost filter signal.

10. The noise-cancellation system of claim 9 , wherein the error sensor is a microphone.

11. The noise-cancellation system of claim 9 , wherein the actuator effort cost function penalizes actuator effort within a range of frequencies.

12. The noise-cancellation system of claim 11 , wherein the actuator effort cost function penalizes actuator effort below a first frequency and above a second frequency, wherein the second frequency is higher than the first frequency.

13. A noise-cancellation method, comprising;
generating, with a noise-cancellation filter, a noise-cancellation signal;
providing the noise-cancellation signal to an actuator for transduction of a noise-cancellation audio signal based on the noise-cancellation signal, the noise-cancellation signal interfering with an undesired noise signal in a noise-cancellation zone;
receiving an error sensor signal from an error sensor, the error sensor signal being representative of residual undesired noise in the noise-cancellation zone;
filtering the error sensor signal with a performance cost filter to output a performance cost filter signal, the performance cost filter signal being representative of the error sensor signal as weighted by a performance cost function; and
adjusting the noise-cancellation filter based on the performance cost filter signal, such that the noise-cancellation audio signal minimizes the performance cost filter signal.

14. The noise-cancellation method of claim 13 further comprising:
filtering the noise-cancellation signal with an actuator effort cost filter that outputs an actuator effort cost filter signal, the actuator effort cost filter signal being representative of the noise-cancellation signal as weighted by an actuator effort cost function, and
adjusting the noise-cancellation filter based on the actuator effort cost filter signal, such that the noise-cancellation audio signal minimizes the actuator effort cost filter signal.

15. The noise-cancellation method of claim 13 , wherein the error sensor is a microphone.

16. The noise-cancellation method of claim 13 , wherein the actuator is a speaker.

17. The noise-cancellation method of claim 13 , wherein the performance cost function increases the interference of a predetermined a frequency.

18. The noise-cancellation method of claim 13 , wherein the performance cost function increases the interference in the noise-cancellation zone and to decrease the interference in a second noise-cancellation zone.

19. The noise-cancellation method of claim 14 , wherein the actuator effort cost function penalizes actuator effort within a range of frequencies.

20. The noise-cancellation method of claim 19 , wherein the actuator effort cost function penalizes actuator effort below a first frequency and above a second frequency, wherein the second frequency is higher than the first frequency.

Assignees

• Bose Corp

Inventors

• Torres Wade

Classifications

• G10K11/1781

  characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions · CPC title

• G10K11/17875 Primary

  using an error signal without a reference signal, e.g. pure feedback · CPC title

• G10K2210/3027

  Feedforward · CPC title

• G10K2210/1282

  Automobiles · CPC title

• G10K2210/3028

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