Active noise cancellation apparatus and method for improving voice recognition performance

Patent metadata

Field	Value
Publication number	US-9704509-B2
Application number	US-201514812300-A
Country	US
Kind code	B2
Filing date	Jul 29, 2015
Priority date	Jul 29, 2015
Publication date	Jul 11, 2017
Grant date	Jul 11, 2017

Abstract

In at least one embodiment, a vehicle active noise cancellation (ANC) apparatus including an ANC controller is disclosed. The ANC controller is operably coupled to at least one error microphone. The ANC controller is configured to receive a first signal indicative of environmental noise that propagates through a vehicle cabin and that is received at a voice recognition (VR) microphone and to generate a noise cancellation wave to remove the environmental noise, the noise cancellation wave being received at the VR microphone. The ANC controller is configured to receive an audio output from the at least one error microphone that is at least indicative of the environmental noise and the noise cancellation wave received at the VR microphone and to apply at least one correction filter to the audio output to remove the environmental noise and the noise cancellation wave that is received at the VR microphone.

First claim

What is claimed is:

1. A vehicle active noise cancellation (ANC) apparatus comprising:
an ANC controller including memory for being operably coupled to at least one error microphone, the ANC controller being configured to:
receive a first signal indicative of environmental noise that propagates through a vehicle cabin and that is received at a voice recognition (VR) microphone;
generate a noise cancellation wave to remove the environmental noise, the noise cancellation wave being received at the VR microphone;
receive an audio output from the at least one error microphone that is at least indicative of the environmental noise and the noise cancellation wave received at the VR microphone; and
apply at least one correction filter from the memory to the audio output to remove the environmental noise and the noise cancellation wave that is received at the VR microphone; and
generate a virtual error microphone when the at least one error microphone is positioned proximate to the VR microphone.

2. The vehicle ANC apparatus of claim 1 wherein the ANC controller is further configured to generate the virtual error microphone during a tuning phase to characterize the environmental noise and the noise cancellation wave that is present at the VR microphone when the at least one error microphone is placed at a location proximate to the VR microphone.

3. The vehicle ANC apparatus of claim 2 wherein the tuning phase corresponds to a vehicle being driven at a plurality of different speeds and on a plurality of roads.

4. The vehicle ANC apparatus of claim 1 wherein the ANC controller is further configured to store information corresponding to the virtual error microphone in the memory.

5. The vehicle ANC apparatus of claim 1 wherein the ANC controller includes a normalize circuit configured to apply at least one of an amplitude and frequency to each output of the at least one correction filter.

6. The vehicle ANC apparatus of claim 1 wherein the ANC controller includes an adder circuit to receive an output from the at least one correction filter and to receive an output from a transfer function.

7. The vehicle ANC apparatus of claim 6 wherein the adder circuit is configured to remove the environmental noise and the noise cancellation wave that is received at the VR microphone based on the adder circuit adding the output from the at least one correction filter and the output from the transfer function.

8. A method for performing active noise cancellation (ANC) in a vehicle, the method comprising:
receiving a first signal indicative of environmental noise that propagates through a vehicle cabin at a voice recognition (VR) microphone;
generating a noise cancellation wave to remove the environmental noise,
receiving the noise cancellation wave at the VR microphone;
receiving an audio output from at least one error microphone positioned in the vehicle that is at least indicative of the environmental noise and the noise cancellation wave received at the VR microphone; and
applying at least one correction filter to the audio output to remove the environmental noise and the noise cancellation wave that is received at the VR microphone; and
electronically generating a virtual VR error microphone when the at least one error microphone is positioned proximate to the at least one error microphone.

9. The method of claim 8 wherein electronically generating the virtual VR error microphone further includes electrically generating the virtual VR error microphone during a tuning phase to characterize the environmental noise and the noise cancellation wave that is present at the VR microphone when the at least one error microphone is placed at a location proximate to the VR microphone.

10. The method of claim 9 wherein the tuning phase corresponds to a vehicle being driven at a plurality of different speeds and on a plurality of roads.

11. The method of claim 8 further comprising storing information corresponding to the virtual VR error microphone in electronic memory after electronically generating the virtual VR error microphone.

12. The method of claim 8 further comprising normalizing each output of the at least one correction filter by applying at least one of an amplitude and a frequency to each output of the at least one correction filter.

13. The method of claim 8 further comprising receiving an output from the at least one correction filter and an output from a transfer function.

14. The method of claim 13 further comprising adding the output from the at least one correction filter and to the output from the transfer function to remove the environmental noise and the noise cancellation wave that is received at the VR microphone.

15. An active noise cancellation (ANC) apparatus comprising:
a memory; and
an ANC controller including a virtual voice recognition (VR) error microphone that is stored on the memory, the ANC controller for being operably coupled to at least one error microphone, the ANC controller being configured to:
receive a first signal indicative of environmental noise that propagates through an enclosure and that is received at a VR microphone;
generate a noise cancellation wave to remove the environmental noise, the noise cancellation wave being received at the VR microphone;
receive an audio output from the at least one error microphone that is at least indicative of the environmental noise and the noise cancellation wave received at the VR microphone;
apply at least one correction filter from the memory to the audio output to remove the environmental noise and the noise cancellation wave that is received at the VR microphone; and
generate the virtual VR error microphone when the at least one error microphone is positioned proximate to the VR microphone.

16. The ANC apparatus of claim 15 wherein the ANC controller is further configured to generate the virtual VR error microphone during a tuning phase to characterize the environmental noise and the noise cancellation wave that is present at the VR microphone when the at least one error microphone is placed at a location proximate to the VR microphone.

17. The ANC apparatus of claim 16 wherein the tuning phase corresponds to a vehicle being driven at a plurality of different speeds and on a plurality of roads.

18. The ANC apparatus of claim 15 wherein the ANC controller includes a normalize circuit configured to apply at least one of an amplitude and frequency to each output of the at least one correction filter.

19. The ANC apparatus of claim 15 wherein the ANC controller includes an adder circuit to receive an output from the at least one correction filter and to receive an output from a transfer function.

20. The ANC apparatus of claim 19 wherein the adder circuit is configured to remove the environmental noise and the noise cancellation wave that is received at the VR microphone based on the adder circuit adding the output from the at least one correction filter and the output from the transfer function.

Assignees

• Harman Int Ind

Inventors

• Konjeti Srikanth
• Hampiholi Vallabha Vasant

Classifications

• G10K2210/1282

  Automobiles · CPC title

• H04R2410/05

  Noise reduction with a separate noise microphone · CPC title

• G10K2210/3028

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

• G10L2021/02165

  Two microphones, one receiving mainly the noise signal and the other one mainly the speech signal · CPC title

• G10K2210/3044

  Phase shift, e.g. complex envelope processing · CPC title