Apparatus, system and/or method for acoustic road noise peak frequency cancellation

Patent metadata

Field	Value
Publication number	US-11990112-B2
Application number	US-202217971377-A
Country	US
Kind code	B2
Filing date	Oct 21, 2022
Priority date	Oct 21, 2022
Publication date	May 21, 2024
Grant date	May 21, 2024

Abstract

In at least one embodiment, an active noise cancellation (ANC) system is provided. The ANC system includes at least one loudspeaker, at least one microphone, and a reference generator. The at least one loudspeaker projects anti-noise sound within a cabin of a vehicle based at least on an estimated reference signal and an anti-noise signal. The at least one microphone to provide a first error signal indicative of noise and the anti-noise sound within the cabin. The at least one filter controller programmed to receive the first error signal and the estimated reference signal; and to control at least one adaptive filter to generate the anti-noise signal based at least on the first error signal and the estimated reference signal. The reference generator is programmed to generate the estimated reference signal based at least on one of vehicle speed, temperature of a tire of the vehicle, or tire pressure.

First claim

What is claimed is:

1. An active noise cancellation (ANC) system comprising:
at least one loudspeaker to project anti-noise sound within a cabin of a vehicle based at least on an estimated reference signal and an anti-noise signal;
at least one microphone to provide a first error signal indicative of noise and the anti-noise sound within the cabin; and
at least one filter controller programmed to:
receive the first error signal and the estimated reference signal; and
control at least one adaptive filter to generate the anti-noise signal based at least on the first error signal and the estimated reference signal;

a reference generator programmed to generate the estimated reference signal based at least on one of vehicle speed, temperature of a tire of the vehicle, or tire pressure; and
a frequency downmixer programmed to convert a full bandwidth signal of one of the estimated reference signal and the first error signal into a sub-band frequency range prior to the at least one filter controller controlling the at least one adaptive filter to generate the anti-noise signal based at least on the first error signal and the estimated reference signal.

2. The ANC system of claim 1 , wherein the reference generator is further programmed to generate the estimated reference signal having a frequency range of interest based at least on one of the vehicle speed, the temperature of the tire of the vehicle, or the tire pressure.

3. The ANC system of claim 1 , wherein the reference generator is further programmed to generate the estimated reference signal independent of information from an accelerometer.

4. The ANC system of claim 1 further comprising memory including a look up table (LUT) to store a frequency value to provide the estimated reference signal to the at least one filter controller based on at least one of the vehicle speed, the temperature of the tire of the vehicle, or the tire pressure.

5. The ANC system of claim 4 , wherein the LUT stores the frequency value based on the at least one of the vehicle speed, the temperature of the tire of the vehicle, or the tire pressure for each tire in the vehicle.

6. The ANC system of claim 5 , wherein the reference generator includes a mixer to sum each frequency value for each tire in the vehicle to provide the estimated reference signal as a single estimated reference signal.

7. The ANC system of claim 1 , wherein the reference generator includes a trained model that provides a spectral envelope of a frequency range of interest for the estimated reference signal based on environmental parameters.

8. The ANC system of claim 7 , wherein the environmental parameters correspond to the at least one of the vehicle speed, the temperature of a tire of the vehicle, or the tire pressure.

9. The ANC system of claim 7 , wherein the trained model represents a historical set of data for the vehicle speed, the temperature of the tire, and the tire pressure and corresponding frequency value.

10. The ANC system of claim 1 , wherein the frequency downmixer includes:
a first aliasing filter programmed to attenuate one of the estimated reference signal and the first error signal to provide a first output;
a first decimator programmed to lower a sampling rate of the first output to provide a second output;
a multiplier circuit programmed to receive a reference frequency and the second output to provide a complex exponential signal;
a second aliasing filter programmed to provide to remove frequencies from the reference frequency that are outside of a predetermined frequency range; and
a second decimator programmed to provide a decimate a third output from the second aliasing filter to increase a frequency resolution of the one of the estimated reference signal and the first error signal.

11. A method for performing active noise cancellation (ANC), the method comprising:
transmitting anti-noise sound within a cabin of a vehicle based at least on an estimated reference signal and an anti-noise signal;
providing a first error signal indicative of noise and the anti-noise sound within the cabin;
receiving by at least one filter controller, the first error signal and the estimated reference signal;
controlling at least one adaptive filter, via the at least one filter controller, to generate the anti-noise signal via the at least one filter controller based at least on the first error signal and the estimated reference signal;
generating the estimated reference signal based at least on one of vehicle speed, temperature of a tire of the vehicle, or tire pressure;
storing a frequency value to provide the estimated reference signal in a lookup table (LUT) to provide the estimated reference signal to the at least one filter controller based at least on one of the vehicle speed, the temperature of the tire of the vehicle, or the tire pressure;
storing the frequency value in the LUT based on the at least one of the vehicle speed, the temperature of the tire of the vehicle, or the tire pressure for each tire in the vehicle; and
summing each frequency value for each tire in the vehicle with a mixer to provide the estimated reference signal as a single estimated reference signal.

12. The method of claim 11 , wherein generating the estimated reference signal further includes generating the estimated reference signal having a frequency range of interest based at least on one of the vehicle speed, the temperature of the tire of the vehicle, or the tire pressure.

13. The method of claim 11 , wherein generating the estimated reference signal further includes generating the estimated reference signal independent of information from an accelerometer.

14. An active noise cancellation (ANC) system comprising:
at least one loudspeaker to project anti-noise sound within a cabin of a vehicle based at least on an estimated reference signal and an anti-noise signal;
at least one microphone to provide a first error signal indicative of noise and the anti-noise sound within the cabin; and
at least one filter controller programmed to:
receive the first error signal and the estimated reference signal; and
control at least one adaptive filter to generate the anti-noise signal based at least on the first error signal and the estimated reference signal; and

a reference generator programmed to generate the estimated reference signal based at least on one of vehicle speed, temperature of a tire of the vehicle, or tire pressure;
wherein the reference generator includes a trained model that provides a spectral envelope of a frequency range of interest for the estimated reference signal based on environmental parameters; and
wherein the trained model represents a historical set of data for the vehicle speed, the temperature of the tire, and the tire pressure and corresponding frequency value.

15. The ANC system of claim 14 further comprising a frequency downmixer programmed to convert a full bandwidth signal of one of the estimated reference signal and the error signal into a sub-band frequency range prior to the at least one filter controller controlling the at least one adaptive filter to generate the anti-noise signal based at least on the first error signal and the estimated reference signal.

16. The ANC system of claim 14 further comprising memory including a look up table (LUT) to store a frequency value to provide the estimated reference signal to the at least one filter controller based on at least one of the vehicle speed, the temperature of the tire of the vehicle, or the tire pressure.

17. The ANC system of claim 16 , wherein the LUT stores the frequency

Assignees

• Harman Int Ind

Inventors

• Trumpy David
• Adari Santosh

Classifications

• G10K2210/3028

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

• G10K11/17879

  using both a reference signal and an error signal · CPC title

• G10K11/17854 Primary

  the filter being an adaptive filter · CPC title

• G10K11/17825

  Error signals · CPC title

• G10K11/17823

  Reference signals, e.g. ambient acoustic environment · CPC title