Method and apparatus for active reduction of mechanically coupled vibration in microphone signals

Patent metadata

Field	Value
Publication number	US-11563894-B2
Application number	US-202117502013-A
Country	US
Kind code	B2
Filing date	Oct 14, 2021
Priority date	Dec 11, 2019
Publication date	Jan 24, 2023
Grant date	Jan 24, 2023

Abstract

An integrated circuit includes a processor that upsamples a vibration signal. The processor determines a correlation value. The correlation value may be based on a microphone signal, the upsampled vibration signal, or both. The processor determines filter coefficients. The filter coefficients may be determined based on the correlation value being above a threshold. The filter coefficient may be based on the upsampled vibration signal. The processor filters the vibration signal based on the filter coefficients to remove a noise portion and obtain a processed microphone signal. The processor outputs the processed microphone signal.

First claim

What is claimed is:

1. An integrated circuit, comprising:
a processor configured to:
upsample a vibration signal to obtain an upsampled vibration signal, wherein the upsampled vibration signal has one or more axial components;
determine correlation values for the one or more axial components, wherein a respective axial component has a corresponding correlation value based on a microphone signal and the upsampled vibration signal;
based on a correlation value from the correlation values being above a threshold, determine filter coefficients based on the upsampled vibration signal;
filter the axial component corresponding to a determined highest correlation value from amongst the correlation values of the upsampled vibration signal based on the filter coefficients to obtain a processed microphone signal; and
output the processed microphone signal.

2. The integrated circuit of claim 1 , wherein the one or more axial components includes an X-axis accelerometer component, a Y-axis accelerometer component, and a Z-axis accelerometer component.

3. The integrated circuit of claim 1 , wherein the one or more axial components includes an X-axis gyroscope component, a Y-axis gyroscope component, and a Z-axis gyroscope component.

4. The integrated circuit of claim 1 , wherein the processor is further configured to:
upsample the vibration signal to match a sampling rate of the microphone signal.

5. The integrated circuit of claim 1 , wherein the processor is further configured to:
filter the axial component corresponding to the determined highest correlation value to obtain a filtered vibration signal and to remove a noise portion of the microphone signal.

6. The integrated circuit of claim 5 , wherein the processor is further configured to:
remove the filtered vibration signal from the microphone signal to obtain the processed microphone signal.

7. A method, comprising:
upsampling a vibration signal to obtain an upsampled vibration signal, wherein the upsampled vibration signal has one or more axial components;
determining correlation values for the one or more axial components, wherein a respective axial component has a corresponding correlation value based on a microphone signal and the upsampled vibration signal;
determining filter coefficients based on the upsampled vibration signal when a correlation value from the correlation values is above a threshold;
filtering the axial component corresponding to a determined highest correlation value from amongst the correlation values of the upsampled vibration signal based on the filter coefficients to remove a noise portion of the microphone signal and obtain a processed microphone signal; and
outputting the processed microphone signal.

8. The method of claim 7 , wherein the one or more axial components includes an X-axis accelerometer component, a Y-axis accelerometer component, and a Z-axis accelerometer component.

9. The method of claim 7 , wherein the one or more axial components includes an X-axis gyroscope component, a Y-axis gyroscope component, and a Z-axis gyroscope component.

10. The method of claim 7 , wherein upsampling the vibration signal includes matching a sampling rate of the microphone signal to obtain the upsampled vibration signal.

11. The method of claim 7 , wherein the axial component corresponding to the determined highest correlation value is filtered to obtain a filtered vibration signal.

12. The method of claim 11 , wherein the filtered vibration signal is removed from the microphone signal to obtain the processed microphone signal.

13. An image capture device comprising:
a processor configured to:
upsample a vibration signal to obtain an upsampled vibration signal, wherein the upsampled vibration signal has one or more axial components;
determine correlation values for the one or more axial components, wherein a respective axial component has a corresponding correlation value based on a microphone signal and the upsampled vibration signal;
filter the axial component corresponding to a determined highest correlation value from amongst the correlation values of the upsampled vibration signal based on filter coefficients to obtain a processed microphone signal; and
output the processed microphone signal.

14. The image capture device of claim 13 , wherein the filter coefficients are based on the upsampled vibration signal, and wherein filtering the axial component removes a noise portion of the microphone signal.

15. The image capture device of claim 13 , further comprising a vibration sensor.

16. The image capture device of claim 15 , wherein the vibration sensor is an inertial measurement unit (IMU) that includes an accelerometer, a gyroscope, or both.

17. The image capture device of claim 16 , wherein the vibration sensor includes the accelerometer, and wherein the one or more axial components includes an X-axis accelerometer component, a Y-axis accelerometer component, and a Z-axis accelerometer component.

18. The image capture device of claim 16 , wherein the vibration sensor includes the gyroscope, and wherein the one or more axial components includes an X-axis gyroscope component, a Y-axis gyroscope component, and a Z-axis gyroscope component.

19. The image capture device of claim 13 , wherein the processor is further configured to:
upsample the vibration signal to match a sampling rate of the microphone signal.

20. The image capture device of claim 13 , wherein the processor is further configured to:
filter the axial component corresponding to the determined highest correlation value to obtain a filtered vibration signal; and
remove the filtered vibration signal from the microphone signal to obtain the processed microphone signal.

Assignees

• Gopro Inc

Inventors

• Dick Timothy
• Penrod Eric
• Tisch Erich

Classifications

• H04R1/342

  for microphones · CPC title

• H04N5/23254

  Electricity · mapped topic

• H04N5/23258 Primary

  Electricity · mapped topic

• H04N5/2257

  Electricity · mapped topic

• H04N5/2328

  Electricity · mapped topic