SYSTEM AND METHOD FOR NOISE CANCELLATION WITH MOTION TRACKING CAPABILITY

• US 20080304677A1
• Filed: 06/12/2007
• Published: 12/11/2008
• Est. Priority Date: 06/08/2007
• Status: Abandoned Application

• Current Assignee: Soundmed, LLC
• Original Assignee: Sonitus Medical, Inc.
• Inventors: Sarraf, Mohsen, ABOLFATHI, Amir
• Application Number:
  US11/761,891
• Publication Number:
  US 20080304677A1
• Time in Patent Office: Days
• US Class Current: 381/71.1
• CPC Class Codes: G10K 11/17821 characterised by the analysis of the input signals only
• CPC Class Codes: G10K 11/17837 by retaining part of the ambient acoustic environment, e.g. speech or alarm signals that the user needs to hear
• CPC Class Codes: G10K 11/17854 the filter being an adaptive filter
• CPC Class Codes: G10K 11/17857 Geometric disposition, e.g. placement of microphones
• CPC Class Codes: G10K 11/17875 using an error signal without a reference signal, e.g. pure feedback
• CPC Class Codes: G10K 11/17885 additionally using a desired external signal, e.g. pass-through audio such as music or speech
• CPC Class Codes: G10K 2210/12 Rooms, e.g. ANC inside a room, office, concert hall or automobile cabin
• CPC Class Codes: G10K 2210/3215 Arrays, e.g. for beamforming

Abstract

A system and method for noise cancellation is disclosed herein generally having at least one microphone, a processor, and a speaker array. The processor may contain an adaptive filtering feature, to separate desirable sound from undesirable sound. The undesirable sound may be suppressed by the processor by creating a canceling waveform and transmitting the canceling waveform to the user'"'"'s head via a speaker array. The desirable sound may be enhanced by increasing the amplitude of the waveform and transmitting the amplified waveform to the user'"'"'s head via a speaker array. The sound transmitted to the user'"'"'s head by the system may be localized using an image tracking subsystem and speaker array. The image tracking system may track the actual visible image or alternatively a heat (e.g. infrared) image of the user'"'"'s head.

Claims

1. A system for noise cancellation comprising:

at least one microphone for detecting sound;

a processor in electrical communication with the microphone, wherein the processor is configured to modify a waveform received by the at least one microphone in a manner to form a canceling waveform with respect to the received waveform; and

a speaker array having two or more speakers which are configured to transmit the canceling waveform generated by the processor in the direction of a user'"'"'s head.

2. The system of claim 1 wherein the microphone is placed in proximity to the user'"'"'s head.

3. The system of claim 1 further comprising a plurality of microphones.

4. The system of claim 3 wherein at least one microphone detects a first desired and undesired sound and at least one microphone detects a second version of the first desired and undesired sound.

5. The system of claim 1 wherein the processor comprises an adaptive acoustic echo cancellation subsystem.

6. The system of claim 5 wherein the adaptive acoustic echo cancellation subsystem is configured to filter undesired sound from desired sound.

7. The system of claim 6 wherein a sample of the desired sound is stored in the processor.

8. The system of claim 7 wherein the desired sound is selected from the group consisting of alarms, sirens, and cries.

9. The system of claim 6 wherein the processor generates a canceling waveform for the undesired sound.

10. The system of claim 6 wherein the desired sound is amplified by the processor.

11. The system of claim 1 further comprising of an image tracking device configured to track a location of the user'"'"'s head.

12. The system of claim 11 wherein the image tracking device is a camera.

13. The system of claim 11 wherein the processor further comprises:

an image tracking subsystem to receive data from the image tracking device; and

a directionality control wherein the control rotates the speakers in the direction of the user'"'"'s head based on the location data received by the image tracking subsystem.

14. The system of claim 13 wherein the speakers are mounted on a rotatable device.

15. The system of claim 14 wherein the rotatable device is a gimbal.

16. A method for noise cancellation comprising:

detecting sounds via at least one microphone;

generating a canceling waveform with respect to the detected sounds;

tracking a position of a user'"'"'s head via an image tracking device; and

transmitting the out-of-phase waveform in a direction of the user'"'"'s head via an adjustable speaker array.

17. The method of claim 16 further comprising filtering desired sound from undesired sound prior to transmitting the canceling waveform.

18. The method of claim 17 wherein filtering comprises filtering sound using adaptive acoustic echo cancellation.

19. The method of claim 17 further comprising amplifying the desired sound.

20. The method of claim 17 further comprising suppressing the undesired sound.

21. The method of claim 16 wherein tracking comprising actively tracking the user'"'"'s head via a camera.

22. The method of claim 16 wherein transmitting comprises moving the effective field of the speaker array according to the position detected by the image tracking device of a location of the user'"'"'s head.

23. The method of claim 16 wherein transmitting comprises transmitting the cancelling waveform via two or more adjustable speakers.